What determines the sound of a car (motorcycle) exhaust system?

A motorcycle muffler is a device that weakens the sound of the engine. Mufflers are needed not so much to reduce noise as to change the timbre. And high-frequency sounds have a more unpleasant effect on the human psyche and ear than low tones.

Many people associate the roar of sports motorcycles with a muffler. And they believe that filling the muffler can reduce the power of the car. But that's not true. When replacing or modifying a muffler, only a small amount of horsepower is lost.

There is an intake and exhaust silencer. And scientific research has proven that if you choose the right basic elements, you can improve the filling of the cylinder. Such mufflers are called resonant mufflers.

Noise suppression is carried out by the part of the muffler located behind the first partition, and it consists of an acoustic filter. These filters on sports motorcycles are made simpler, since a higher noise level is allowed in sports motorcycles.

When deciding to remake a muffler, you need to remember the following. Sometimes, when improving one part, you have to sacrifice the quality of another. No one has yet succeeded in creating a universal motorcycle.

Manufacturers recommend using factory mufflers for your motorcycle. The muffler cavity becomes covered with carbon deposits, which can close the acoustic filter channels. Therefore, the cavity of the device must be cleaned regularly. The resulting carbon deposits prevent the exhaust gases from escaping, and engine power is reduced. After every five to ten thousand kilometers, mufflers need to be cleaned.

The original mufflers are quite quiet and good. Their disadvantage can be considered their heavy weight and size. Many consider their high price to be a disadvantage. Silencers are produced by many companies, and you can use a non-original muffler if you wish. Most often these are open mufflers. In them, exhaust gases exit the engine without any obstacles. But they make a lot of noise.

Those who love the loud roar of motorcycles can buy the cheapest muffler, which does not muffle anything. But if the roar of the motorcycle does not suit you, then you will have to buy an expensive option.

These mufflers differ in design and material of manufacture. There are four types:

• Titanium. He is considered the best. It's light, looks nice, and doesn't get too hot.
• Aluminum. Light enough. It looks worse than titanium, but there is a drawback. You can get seriously burned.
• Carbon. Looks nice, light and cool. But its significant drawback is that even with vibrations it can crumble.
• Stainless steel. Strong and heavy, but very hot.

Each type of muffler has its own advantages and disadvantages. Therefore, you need to choose for yourself.

You can buy a direct-flow muffler in any specialized stores. They are usually of interest to young motorcyclists who dream of high speeds. But real bikers are not sold on stickers from famous brands. They do everything they need with their own hands.

If you want to enter the world for real men, you need to make a direct-flow muffler with your own hands. When riding at normal speed, its noise will not be different from other motorcycles. But as the speed increases, the characteristic rumble of the engine appears. What do I need to do?

• Take a piece of pipe that has a diameter of 60 mm and cut it in half. First, one part is processed and a flange is welded in the middle. The outer part does not change. This is the inlet pipe. In half of the pipe, which is located in the muffler, you need to drill a large number of holes using an electric drill. You need to use a 5-6 mm drill. Recess the flange with a ten-millimeter tip into a pipe with a diameter of 100 mm and weld it.
• We are preparing the second pipe. Weld a flange to the second section of pipe. It should be 80 mm from the edge. This part of the pipe will be inserted into the muffler.
• Carefully lay mineral wool insulation into a pipe with a diameter of 100 mm. This is to combat noise reduction. To do this, roll the cotton wool along the diameter of the pipe and push it to the opposite side.
• Roll up the mesh and lower it inside the insulation that was inserted into the pipe. The mesh should fit onto the pipe with holes.
• Now you need to insert the flange with the pipe, which you prepared in advance, into the pipe with the short end. It needs to be recessed to a depth of 10 mm and welded.
• You can cut off the fastening elements from the old muffler and transfer them to the direct-flow muffler by welding them.

How to make a quiet muffler on a car - tuning the silence

Only a small part of car enthusiasts would like to have a loud sports exhaust on their car. The vast majority of drivers, on the contrary, are puzzled by the question of how to make a quiet muffler. Driving can be comfortable only if as little extraneous sounds as possible enter the cabin. The muffler creates its own background noise, which can be significantly reduced. The effect of this cannot be ignored.

Basic ways to make a muffler quieter

Before you begin upgrading your exhaust system, you should understand the nature of the increased exhaust sound. With each working stroke of the piston, a micro-explosion occurs in the combustion chamber of the engine cylinder, which is accompanied by a significant sharp expansion of gases. Naturally, a kind of blast wave, after it has done its job and moved the piston down, rushes through the exhaust system with the opening of the exhaust valve.

Thus, the nature of exhaust system noise is twofold:

• sound from expansion of gases;
• noise from vibration of exhaust system elements.

As you know, the main way to combat noise is to increase the weight of the elements. The thicker the metal, the less vibration and, accordingly, noise. That is why the exhaust manifold, which is the first to absorb hot gases from the cylinder head, is made so massive. Many car enthusiasts who had the opportunity to compare the weight of the exhaust pipe of a domestic car and a foreign one noted that the exhaust system parts of foreign cars are much heavier. This is why “our” cars are less comfortable in sound and noise comparisons.

Special elements are designed to reduce the speed of gas movement in the exhaust pipe: resonators and mufflers. First in line is the resonator. As soon as gases under pressure enter a part of the pipe with an increased volume, they immediately lose some of their energy and move further with less momentum. In the muffler labyrinth system, the exhaust gases finally lose their energy and are dissipated. A real quiet muffler on a foreign car is quite heavy and has several separate housings.

Do-it-yourself quiet muffler, video:

Making a quiet muffler with your own hands

When starting to modernize the exhaust system in order to reduce exhaust sound, you should be prepared technically and financially. For work you will need a full set of car mechanic tools. In addition, you will definitely need:

• welding machine (preferably semi-automatic or inverter);
• angle grinder with a set of discs;
• a workbench equipped with a vice.

One of the most affordable ways to get a quiet muffler in the average garage is to include an additional resonator in the existing exhaust system.

There are also two options for upgrading the exhaust system: installing an additional factory-made resonator in the area between the main resonator and the muffler, or making the device yourself.

When considering how to make a muffler quieter, it should be borne in mind that any of the options may entail different costs. If the car enthusiast is not limited by budget, then you can safely buy a new resonator, cut out part of the pipe and weld it into the free space. The second method turns out to be more exciting and should be described in more detail.

The manufacturing technology of an additional resonator consists of the following stages:

• manufacturing a body (barrel) from a piece of thin-walled steel pipe or sheet steel in the form of two halves;
• making holes in a section of the exhaust system pipe corresponding to the length of the body behind the main resonator;
• connecting the body halves on a pipe with holes and scalding;
• laying basalt mineral wool into the cavity of the new body;
• welding of the end parts of the resonator.

Finally, the welds should be processed, the new resonator should be cleaned and degreased, and if possible, painted with heat-resistant paint.

Video, what is an exhaust manifold and resonator?

Additional problems of a quiet car

Once the question of how to make a quiet muffler has been resolved, some problem areas become apparent. First of all, it should be remembered that any of the methods for producing a “quiet” exhaust system will certainly lead to an increase in the weight of the structure.

This, in turn, obliges the car owner to take additional measures to strengthen the brackets and rubber shock absorbers. Another point to consider is the change in the balance of air entering the engine and exhaust gases. After upgrading the exhaust system, it is imperative to test the operation of the engine in different modes and make additional adjustments to the fuel supply and air filtration system.

Why do you need a straight-through muffler?

When designing any car, designers take into account the amount of exhaust gases produced by the engine, and based on this, they create an exhaust gas removal system for the engine with the required throughput.

By making changes to the design of the power unit - tuning it, many parameters change, including an increase in the amount of gases. The standard exhaust gas removal system will not cope with the task, because of this, a larger amount of exhaust gases will simply “choke” the engine, in fact, all the alterations will be in vain.

Therefore, when tuning the power plant, the exhaust gas exhaust system is also redesigned in order to primarily increase throughput. To do this, almost all the components of this system are changed - a different manifold, pipes of increased diameter and a direct-flow muffler are installed. As a result, gases are removed much faster, and the cylinders are also better purged from them, which helps to increase power indicators, but affects the noise level. The power of the power plant from the use of a redesigned exhaust system increases by 10-15%.

Now about the sound, or more precisely about where it comes from. In general, the reason for the strong noise effect in internal combustion engines is the high speed of exhaust gases. And to reduce it, a muffler is used in the design of the exhaust gas removal system. Its main task is to reduce the speed of movement of these gases as much as possible, thereby reducing the sound. In fact, this element in the design is a labyrinth for gas, after passing through which, the speed of its movement is significantly reduced, and therefore the noise is reduced.

The use of pipes of increased diameter and a muffler in the exhaust gas exhaust system, which does not have this same labyrinth (direct flow), leads to the fact that the speed of gas movement does not decrease (this is what is needed for the cylinders to be well purged), which means that the system reduces noise is not implemented. Hence the rich low-frequency sound.

Why is forward flow needed and why sometimes it needs to be muffled

A car with an exhaust louder than 96 dB will not be able to pass a technical inspection and will not cross the border - in Europe, traffic rules are strict, and the police are incorruptible. Even in motorsports, sound is limited. Only Formula 1 promoters don't like the attempt to drown out the noise from cars. They even opposed the new regulations for the transition from eight-cylinder engines to V6, fearing for the prestige of racing.

When properly configured, resonant exhaust provides an increase in torque by 3–9% for naturally aspirated engines, and more than 10% for turbocharged engines. But in production cars, the increase in the rate of filling the cylinders with the working mixture during modernization is less than 2–3%.

Installing a direct-flow muffler on regular stock cars is only needed as a decorative option for a pleasant exhaust timbre. The main criterion for the quality of direct flow operation on a production machine is the euphony and velvety noise of the motor, and not the increase in power. The car will scream louder or quieter - this will not affect the speed and dynamic characteristics. In this case, when there is an urgent need to stop the forward flow, you can do this without thinking about the consequences.

Why do motorcyclists need forward flow on a motorcycle?

The exhaust system is designed to perform several tasks.
Exhaust gases are removed. The exhaust gases better fill the engine cylinders. And dampens the noise. The spent mixture leaves the cylinders at a very high speed and therefore creates a loud noise. It is the muffler that reduces the noise of exhaust gases due to the obstacles installed in it. A straight-through muffler simply does not have baffles that reduce noise. In this case, exhaust gases exit without obstruction, and engine power increases. Therefore, the noise on such motorcycles is like a roar.

A direct-flow muffler or direct-flow muffler on a motorcycle produces a peculiar engine roar and is not accepted by many people. It is believed that motorcycles with such a muffler disturb people and pollute the atmosphere.

Motorcyclists who promote quiet riding in the city do not accept straight-through mufflers. But experienced bikers are sure that forward flow is not only passive safety, but even active safety on the roads. How? The fact that you can indicate your location in the traffic.

Sometimes it is difficult to show some drivers even with a signal or headlights that you are nearby. And only the roar of the muffler helps to do this. And it happens that the sound of the muffler stops the driver from a careless maneuver that could lead to an accident.

What is a flute in a direct-flow muffler, and what is its effect?

To make the forward flow quieter and get “passing” decibels at the output, a simple design is used, which motorists call a flute. This is a piece of perforated tube with a length of 180–250 mm and a diameter of slightly more than 1/3 of the exhaust, with a welded plug washer in the form of a disk, cylinder or cone, which is bolted inside the forward flow, at the air cut, thereby allowing it to be muffled.

The principle of operation of the flute for direct flow is that when the cross-section of the exhaust channel changes and exhaust gases exit through the perforations, the following occurs:

• change in speed and pressure;
• the sound wave breaks;
• the volume decreases by 3-4 dB, the exhaust becomes quieter.

Main details of the direct-flow system

A direct-flow system on any car will work correctly only if all the parts are optimized for the model. Installing only the muffler itself will give partial results. In general, the system will consist of the following components:

• Collector. It is made of stainless steel, which reduces weight and makes it possible to configure it with resolution zones. This allows you to remove resistance to gas flow.
• Catalyst. Usually here there is a replacement with a sports version (flame arrester), which has an increased throughput. It is also possible to replace it with a simple pipe.
• Resonator. Here it is possible to completely remove this part or replace it with a sports one.
• Muffler. The dimensions and length will depend only on whether the resonator is installed or not.

How to make a straight-through muffler with your own hands? This homemade muffler is now widely used by many motorists. And each of them boasts some specific installation technology. Below we describe one of the most popular options.

DIY flute for direct flow

If you have the desire and skill, then making a flute with your own hands in order to muffle the forward flow is not at all difficult. It will turn out cheaper than the branded one, but not always better than the Chinese one.

To work, you will need a 20 mm steel (preferably stainless) pipe and a piece of sheet metal 0.8–1.2 mm thick. It is advisable to cook using arc welding, following the rules for working with stainless steel. A pre-bent steel sheet plug with holes for fastening is welded to the pipe. You can screw it with three M8 bolts, but for installation in a few minutes, one threaded connection is enough.

During manufacturing, you should try to carefully measure the internal diameter of the muffler at the air end so that the plug fits in loosely, but without a gap. Then, when heading out to the track, you can quickly remove the flute from the hot pipe with a pair of wrenches or pliers.

Replacing a return flow muffler with a direct flow one with your own hands

When manufacturing a direct flow, it is advisable to use the positive properties of several types of structures.

Reasons for replacing a standard muffler with a direct-flow muffler

Car owners change the factory muffler to a direct flow one for several reasons:

• obtaining an increase in engine power;
• subjective improvement of acoustic parameters of the exhaust;
• increasing the aesthetic parameters of the car;
• complete modernization of the exhaust channel;
• The installed muffler has failed.

Tools and materials for work

A direct-flow muffler is often purchased, but for lovers of tools and an insatiable thirst for creativity, we recommend making it yourself. It is preferable to make parts from stainless steel with a thickness of 0.8–2.0 mm. Select ferrous metal blanks with a thickness of 1.0–1.5 mm for the case, the rest 2.0–4.0 mm to avoid premature burnout of parts, and also use standard blanks. For the body, use a suitable size: a fire extinguisher, a thermos, an empty gas or scuba cylinder.

To fill the muffler chamber, non-flammable porous material or a combination of them is used:

• basalt or other mineral wool;
• fine mesh metal mesh;
• metal mesh for the kitchen;
• metal shavings.

• angle grinder (grinder);
• drill or drilling machine;
• welding machine;
• consumables: metal discs for grinders, drills, electrodes, etc.

Reworking an old muffler

1. We dismantle the old muffler, disassemble it using a grinder, leaving the body parts and the inlet pipe. While preserving the partitions, we drill holes in them for the passage of exhaust gases. The cameras further reduce exhaust volume.

We cut out everything that is not needed from the old muffler

We perforate the inner pipe in an accessible way. The diameter of the perforated pipe is equal to the diameter of the inlet pipe or more up to 30%.

a small number of small holes will help preserve the rich bass rumble from the engine when exhausting

Keep in mind that mineral wool fibers will be “blown out” of the chamber faster through large holes and grooves.

Stainless steel helps to increase the service life of parts and mechanisms several times

In the future, the diameter of the inner pipe can be reduced by simple manipulations, but increasing it is disproportionately more difficult.

cut the length of the pipe to the required size

We put metal mesh for the kitchen in place of the perforation of the pipe.

cover the internal perforation with fine-porous non-flammable material

Wrap the kitchen mesh tightly with metal mesh in 1-3 layers. We fix the mesh with annealed steel wire with multiple twists or crimp it with several clamps.

We enhance perforation, reducing its permeability to mineral wool

We coordinate and clean the welding points, weld the perforated pipe into its regular place.

We carry out welding in compliance with all safety rules

We fill all free space inside the muffler tightly with the selected filler.

the presence of several chambers contributes to greater functionality of the muffler

Working with mineral wool requires personal protective equipment.

the absence of a metal mesh between the holes and the wool will lead to a faster “blowing” of the wool out of the muffler

We grab the edge of the “lid” of the body with two or three tacks to avoid displacement and weld the body.

To protect against corrosion and give it an aesthetic appearance, we paint it with heat-resistant paint in your favorite color.

To make the muffler last longer, we drill one or more holes with a diameter of 1.5–2.0 mm in the housing to drain condensate. To determine the lowest point, the car must be horizontal.

Videos about the muffler

There are many videos on the Internet in which the authors inventively and simply demonstrate how to make a direct flow with their own hands.

Video: how to make a straight-through muffler with your own hands

Another clear example of making a muffler from scratch. The straight-through version is made of stainless steel with two exhaust pipes.

Video: how to make a straight-through muffler from stainless steel

Direct flow with damper

To make a quiet direct-flow muffler, but not lose the additional power that modernization of the exhaust tract gives, use a direct-flow muffler with a damper. This exhaust design has been known for a long time and is found on many BMW models (usually with manual transmission).

When the engine is running at low settings, when the advantage of the coordinated exhaust is not taken advantage of, the exhaust gases exit through a conventional muffler, and the direct-flow muffler is closed with a damper. At optimal speeds, the damper opens the outlet into forward flow, and the motor produces maximum torque due to enhanced ventilation of the cylinders.

The damper control is automatic, but there are also manual models. In the city, such a car sounds almost no different from a stock one, and on the highway it not only sounds like a tuner, but has a real increase in power. It’s not cheap - for a full automatic machine, complete with a titanium “spider”, the price often exceeds a couple of thousand dollars.

Similar in capabilities, but not very famous analogues are moderately expensive, but it is better to select a suitable option with a specialist - the success of such an upgrade may require the knowledge of a motor engineer.

A budget option for direct flow with a damper can also be welded yourself from scrap materials. The upper part from an old carburetor will be suitable for the damper, if you bring the idle speed cable into the cabin. Making such a design with your own hands will take much more effort and time than for a homemade flute, and the result of the installation cannot be predicted in advance. It's not difficult to mute the sound, but to maintain power, even if you're lucky, you'll have to tinker with the settings.

Muffler material

Before you decide to create your own masterpiece of direct flow for a motorcycle, you can familiarize yourself with the ready-made mufflers available for sale. Models made from various materials are available on the market:

1. Titanium is one of the best. Light, beautiful and almost do not heat up.
2. Aluminum ones are perhaps the lightest, but they become very hot during operation.
3. Carbon ones are beautiful, light and don’t get hot, but they’re very fragile.
4. Steel ones are reliable and strong, but very heavy and hot.

Of course, the price for them is different. You can find a suitable one, taking into account the size of the motorcycle, or you can choose the muffler recommended by the manufacturer. Installing a ready-made forward flow on a motorcycle will take much less time. But if you still want to do it yourself, then you should be patient.

How to make a homemade muffler for a motorcycle

One of the most important disadvantages of any motorcycle is the unpleasant sound produced by a high-speed engine - its tonality has a depressing effect on the human nervous system. At the same time, the volume of such sounds leaves no doubt that they will be heard by people within a radius of several city blocks. That is why engineers created a special muffler for a motorcycle, which not only reduces the volume of unpleasant sounds, but also seriously changes their tonality. However, any obstacle in the path of exhaust gases forces you to reduce engine power for the sake of its safety. Therefore, many motorcycle owners are interested in how to make two-wheeled vehicles more powerful without sacrificing their health and the comfort of those around them.

Types of mufflers

A motorcycle muffler is a device that weakens the sound of the engine. Mufflers are needed not so much to reduce noise as to change the timbre. And high-frequency sounds have a more unpleasant effect on the human psyche and ear than low tones.

Many people associate the roar of sports motorcycles with a muffler. And they believe that filling the muffler can reduce the power of the car. But that's not true. When replacing or modifying a muffler, only a small amount of horsepower is lost.

There is an intake and exhaust silencer. And scientific research has proven that if you choose the right basic elements, you can improve the filling of the cylinder. Such mufflers are called resonant mufflers.

Noise suppression is carried out by the part of the muffler located behind the first partition, and it consists of an acoustic filter. These filters on sports motorcycles are made simpler, since a higher noise level is allowed in sports motorcycles.

When deciding to remake a muffler, you need to remember the following. Sometimes, when improving one part, you have to sacrifice the quality of another. No one has yet succeeded in creating a universal motorcycle.

Manufacturers recommend using factory mufflers for your motorcycle. The muffler cavity becomes covered with carbon deposits, which can close the acoustic filter channels. Therefore, the cavity of the device must be cleaned regularly. The resulting carbon deposits prevent the exhaust gases from escaping, and engine power is reduced. After every five to ten thousand kilometers, mufflers need to be cleaned.

High-quality forward flow

Despite the apparent complexity of such an operation, you can make a direct-flow muffler for a motorcycle yourself, saving up to $1000 on the purchase of a product from a famous brand. First of all, you should decide on the type of materials you will use in your work. Experts give the following recommendations:

• The best option would be titanium, since it has very high strength with minimal weight. However, bending titanium sheet to produce a muffler will be very difficult, as will finding welding equipment. You don't even need to mention the incredibly high cost of titanium;
• Aluminum is excellent for muffler production for the reasons described above. However, when using it, it will be problematic to connect the device to the motorcycle engine;
• Stainless steel has a large mass, but is durable and quite easy to bend. To weld a motorcycle component from this material, you will need specialized equipment;
• Ferrous metal is heavy, has low reliability and requires repeated processing. However, it is recommended for use by beginners due to the ease of bending and welding.

The thickness of the metal should be approximately 0.8–1.5 mm so that it can easily bend and weld without burning. Once you've selected the metal that best suits your muffler, spend some time researching the required equipment to cut and weld it.

Now it’s time to make muffler patterns for a motorcycle. The first thing to make is the resonator cone, which connects the device you are making to the motor of the two-wheeler. You can also make it yourself - to create the correct pattern, you need to remember that the planar projection of the cone is a sector of a circle. Next, pipes are taken that correspond to the diameter of the exhaust system - there should be three of them. Remember that it is better to take pipes for a motorcycle muffler ready-made, although if desired or if there are no suitable materials, you can weld them yourself.

The first pipe will be approximately 50 mm long (more if necessary) - it will connect the engine to the new muffler. The second will serve as an outlet - it needs to be given a similar length. The third will go inside the muffler housing and will serve to reduce the intensity of sounds. To get a quiet enough muffler, you need to make the last pipe long enough. However, it is worth understanding that increasing it will lead to a lengthening of the motorcycle muffler housing.

All that remains is to cut out the body itself—whether it will be cylindrical or flattened depends only on your desire. The minimum case diameter is 100 mm, but if possible it should be 150–170 mm. The sides of the body are made of similar sheet metal, after which holes for pipes are made in them. The first and second pipes described above are processed, after which they should form a flange that allows them to be firmly secured inside the muffler. You need to drill a lot of holes in the third pipe - the best option would be holes with a diameter of 1 mm in increments of 10-15 mm, then insert it inside the body and securely fasten it between the first and second.

Making the exhaust quieter? — Community “Kulibin Club” on DRIVE2

Hi all!

I was already terribly shaken by my mega screaming can... Naturally the Pro-Sprat can... please don’t kick me, I took it purely for the sake of design because I liked how it fits the body kits... The rest of the exhaust is MG-RACE... well, there’s a big resonator, but still Banko screams wildly... sometimes, of course, it’s fun, especially at high speeds, but for everyday use it’s hell, and I already feel sorry for the neighbors

Sound on video of my exhaust))

Well, I started googling what and how to make it quieter... Naturally, the easiest option is to install a silencer (flute), but we are not looking for easy ways, and as you can see from photo number one, the flute will not fit into this jar (and even in diameter I can’t find a normal one). Option number two is to fill the jar with glass wool (preferably, of course, basalt wool), so I’m thinking of carrying out this operation. BUT! I am confused by the following words of the authors, that they came to this conclusion when they started tapping the jar, and a ringing sound came from it (hence it was empty or half-empty)

PS The following photos are from the internet, taken from other posts

I tried to tap mine, so everything is dull there, like you’re hitting a concrete wall, and that’s when doubts crept in, whether it’s worth sawing it and re-hammering it again, or whether it’s just that way on its own and it’s not worth cutting it up, but selling and buying an option more impressive?

Perhaps someone has already carried out this procedure and have a clear example? Thank you in advance

www.drive2.com

Alternative options

If you are interested in how to make a muffler quieter without losing precious horsepower, you can use a scheme that has been used in Chinese motorcycles for quite a long time. However, it is worth remembering that this option is only suitable for the production of mufflers for low-power motorcycles, whose performance does not exceed 40 hp. With. A pipe is inserted into the muffler body two-thirds of its length, the last 10 centimeters of which are covered with small holes according to the scheme described above. Having installed the inlet pipe, we are engaged in the outlet, which will be a pipe of a slightly larger diameter, inserted from the opposite side by two-thirds. It also remains to drill holes in 10 centimeters located closest to the motorcycle engine - such a muffler will represent a compromise between forward flow and the factory product.

If you know the structure of a motorcycle muffler, you can probably make a forward flow from an ordinary part. After opening the housing, you will see tubes that pass through special chambers, first to the end of the muffler, and then back and again to the exhaust pipe. These, as well as the motorcycle's catalytic converter, will need to be removed to achieve the desired effect. The perforated tube mentioned in the previous diagrams is inserted inside and wrapped with fiberglass. Of course, you can buy a special synthetic material used in the packing of original mufflers, but it will obviously cost more.

If you already know how to make a motorcycle muffler that fully meets your requirements, do not forget about fine-tuning the exhaust - for this you need to select the optimal diameter and position of the pipes, as well as the density of the holes. It is almost impossible to achieve an ideal result without using a special stand, so you will have to be content with approximate parameters obtained experimentally. In addition, after installing a different muffler, the motorcycle engine should be retuned. Modern injection engines will require the installation of new firmware, but carburetor motorcycles get by with a simple adjustment of the fuel system. Not every motorcyclist can do this kind of work, so it is quite possible that you will have to go to a specialized service center.

Installation of active exhaust sound.

You can also make the sound more bassy through exercise. This is the installation of some kind of audio system in the exhaust route, which reproduces the already recorded artificial sound of existing exhausts. This could be, for example, the sound of famous cars such as Lamborghini, Maserati, Jaguar and so on.

• The advantage of this option is that you can change the sound at least every minute, controlling it through a special application on your phone.
• The disadvantage of the procedure is the high cost and artificiality of the sound, since, whatever one may say, the live sound of a car cannot be confused with anything.

Independent work

Making a motorcycle muffler can be quite simple, but will it fully meet the requirements for it? Get ready for the fact that the first product you make with your own hands will require certain modifications and many hours of adjustments. However, practice shows that the second or third time it is possible to make a muffler for a motorcycle that initially meets all the required parameters. Sometimes it happens that it is not possible to make the required muffler for a motorcycle at all - this may be due to a lack of experience or certain design features of the equipment. In this case, it is better to buy a finished product from a well-known manufacturer or order the production of a direct flow from a real professional.

How to repair a muffler with your own hands without welding?

Now there is a new method for restoring the performance of exhaust system parts using a universal composite polymer (various sealants). Thanks to their special composition, they harden quickly and are not subject to external negative influences, including high temperature changes, which is very important for the exhaust system. In car markets you can find two types of sealants, thanks to which you can repair the muffler yourself without welding:

• Plastic.
• Liquid.

In combination with high-quality reinforcing components, these types of sealants will create a reliable “patch” on the burnt-out section of the muffler. Car enthusiasts note the effectiveness of plastic elements. It is these sealants that are characterized by high adhesion to metal, even if there is rust on it.

How to make the exhaust quieter with your own hands

Many car owners are interested in whether it is possible to make their too noisy car quieter on their own. A very small number of car enthusiasts are satisfied with the deafening sports exhausts of a running car. For all people, the degree of convenience is very important.

Driving by car can only be enjoyable if you hear as little extraneous and unpleasant sounds as possible inside the car. Also, when traveling by car, it is not safe for the driver to switch to untimely loud sounds - this can lead to an accident. In addition, too loud sounds emanating from the car can cause dissatisfaction with the people around you.

The muffler creates its own background noise, which can be greatly reduced. The result is always very good.

It must be said that here there is information only about a typical exhaust system and muffler. The direct-flow system is not considered. Always remember that both systems are very different from each other. It should also be noted that information is not provided here about the method by which the internal structure of the muffler is rebuilt, a lot of welding work is carried out, etc. This article presents the most popular, accessible and simple methods.

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Negative aspects that appear when installing a direct-flow muffler

It’s worth mentioning right away about the possible negative consequences of installing a direct-flow muffler. First of all, it will not be possible to honestly pass the technical inspection, which, however, after the abolition of the mandatory inspection at the traffic police, has ceased to be a problem. Insurance companies sell maintenance without even looking at the car.

The second important disadvantage is this. that, most likely, you will irritate others, especially in your yard, if mothers with children, grannies like to walk there, and many others are also unlikely to be happy. But everyone will definitely know you by sight and back. But maybe that's what you want to achieve.

The third point is that it is quite possible that after such a change in the design of the exhaust system, fuel consumption will increase. If there is an increase, it will be insignificant, and if a couple of extra rubles do not matter to you, then this cannot become an obstacle either. There is a much more significant negative factor...

After installing a direct flow system, disappointment is certainly possible due to the discrepancy between the final result and what you expected to receive as a result of the modernization. This refers to the final sound.

Surely, many have heard the sound of cheap direct-flow mufflers installed on domestic cars. When, after very grueling work, you achieve the same thing, then your disappointment will know no bounds. That is, if you take on this work without experience, then be prepared for the fact that you may have to redo everything several times.

In addition, after installing a direct-flow muffler, it is recommended to install additional sound insulation, because a loud roar will deafen not only those around you, but also yourself.

So think carefully about whether you need to install forward flow on your car, or is it better not to change anything? If you are firmly convinced of your intentions, then let's get down to business.

Causes of loud exhaust

In all combustion chambers, processes occurring with the pistons located in the cylinder are necessarily accompanied by small explosions. The volume of gas instantly increases, which provokes the movement of the pistons downward. The exhaust valve then opens and a wave of gas enters the expansion of the exhaust device.

Too much noise comes from powerful mechanical vibrations in the exhaust gas outlet device. Very large expansions can contribute to loud noise. As a result, all components of the exhaust device are made of very dense and durable metal - it helps reduce noise and vibration.

A loud exhaust may be the result of a malfunction of the muffler, catalytic converter, or other parts of the exhaust system. If you are not sure that the exhaust system is in order, it is better to contact a car repair shop. However, you can try to find the cause yourself and, for example, if the old muffler or resonator is to blame, then you can replace them yourself.

What are the benefits of installing a direct-flow muffler?

Thanks to it, a loud, bassy sound is created, which will certainly begin to distinguish you from the entire stream of cars and attract the attention of passers-by. In principle, this is the only reason why a direct-flow muffler is installed

Listen to how this can be, although, of course, the speakers are unlikely to convey the true sound, but to have an idea...

If we consider the direct purpose of the forward flow, then it can be noted that it contributes to a faster removal of exhaust gases from the engine (which also undergoes a certain tuning if we are talking about sports history).

A conventional exhaust system noticeably limits the tuned engine, but a direct-flow muffler helps increase power. But in our case, we should only count on the appearance of a powerful “sporty” sound; if an increase in power occurs, it will be insignificant and it is unlikely to be felt while driving.

How to make the exhaust quieter with your own hands

Upgrading your machine will help make it as quiet as possible. Everyone knows that noise cannot be completely eliminated, but it can be reduced. To create a quiet muffler, different methods are used:

• install another muffler in place of the old one;
• I install an additional resonator;
• install a resonator equipped with an absorbing filler.

Each of the above methods has advantages and disadvantages. If you are upgrading your car's exhaust system yourself to reduce the exhaust sound, you need to have everything you need for the job. For such manipulations you need to have a set of car mechanic tools. You will also undoubtedly need:

• Welding machine. If a choice is possible, then use a semi-automatic or inverter;
• Angle grinder (angle grinder) with a set of discs;
• A workbench equipped with a vice.

Before starting work, you must choose one of the methods for upgrading the exhaust pipe. The first method is to install another factory-made resonator in the area between the first resonator and the muffler. You can also make it yourself.

The first option is the simplest, most popular and accessible. When choosing a method for constructing a low-noise muffler, it is necessary to take into account that the chosen method will lead to various financial expenses. If the owner of the car has the required amount of money, then it is best to purchase a resonator, remove a fragment of the pipe and weld the purchased device into the free space. The second method is undoubtedly much more interesting. The manufacturing technology of such a mechanism must be carefully studied before proceeding with its implementation.

How to reduce the sound of a muffler in a car with your own hands

There are fans of direct-flow exhaust, when a loud roar of the engine is heard. But there are also those who think about how to reduce the sound of the muffler. If you make a quiet muffler with your own hands, then the ride will be more comfortable, because the cabin will be quieter. Especially on domestic cars like the VAZ 2109, the question of how to make a silent muffler is relevant. If you can make a quiet muffler on the nine, then the car will bring more joy to its owner.

Ways to muffle the exhaust sound

The explosion releases energy that pushes the piston, and when the piston has moved the required distance, the exhaust valve opens, through which the exhaust gases exit and go further through the exhaust system. To effectively absorb noise, thick metal parts are used. So, the thicker the metal used in the exhaust system, the quieter the car will drive due to the fact that there will be less vibration.

The exhaust manifold is the first one to absorb the noise, which is why it is made so large and thick, so it best dampens the noise that comes from the cylinder block. Even if you compare the exhaust pipe of any more or less normal foreign car with the exhaust pipe of a domestic car, you can see that in foreign cars the pipe is heavier and thicker, which is why such a car runs quieter.

This is why when you drive an old VAZ 2114, the noise is such that you can’t hear what the passengers in the rear seats are saying, which is why you start thinking about how to muffle the exhaust sound.

Muffler replacement

The noise reduction device must be changed from time to time. In most cases, after a certain period of use, it begins to make loud and unpleasant sounds during operation. This is facilitated by the development of corrosion, burnout of perforated areas of pipes, and breakdown of sound reflectors.

First of all, you need to park the car on a flat, hard surface, make sure that the car does not roll anywhere, and jack it up. It is better to install it on trestles after lifting the car, but you can also use an inspection hole.

Before removing the muffler, it is recommended that you lubricate all bolts and clamps that will need to be removed with a penetrating lubricant such as WD-40. You can try removing the rust with a stiff steel brush. In the worst case, you will have to cut the bolts, as the flanges often become sour.

Next you need to remove the muffler itself. First, you need to unscrew the bolts on the flanges, after which you separate the muffler from the exhaust pipe, which is then recommended to be secured with a rope or some kind of wire to the steering rack so that it does not dangle.

The muffler is then removed from the rubber pads that cushion it.

After unscrewing all the bolts and removing all the cushions, the muffler should simply be pulled out.

The new muffler must match your car model and make. It is recommended to buy it from trusted auto stores and trusted brands. It is worth paying attention to the quality and thickness of the steel on the tank. On average, it varies from 1.2 to 1.5 mm.

Installing a new muffler is carried out in the reverse order described above. In general, there is nothing complicated.

You can watch the video :

How to make a muffler quieter on a motorcycle

+1

Perhaps it is not so loud when it is not empty and new, they make a lot of noise after all the glass wool has been knocked out of it. It must be periodically replaced with a new one. Replacement kits are sold. A friend gave me some Yamaha cotton wool, I changed it last week. They say that you can get it at car repair shops where mufflers are repaired.

There is the simplest option to Slightly reduce the noise level of a direct-flow muffler: A steel strip 1.5-2 mm thick is inserted into the muffler pipe. Width equal to the diameter of the muffler pipe, perforated with holes. The diameter of the holes is 4-5 mm. This strip should be twisted around its axis by one and a half turns. I did this on my motorcycle. To prevent the cotton wool from quickly blowing out, I wrapped the perforated pipe in one or two layers with a fine-mesh stainless steel mesh. The mesh is 1x1 mm. Then the mesh is fastened with wire clamps - 4-5 per muffler. Additionally, I install 2-3 metal washers dividing the muffler into unequal distances - unequal so that resonance does not occur. The washers are welded from the outside to the perforated muffler pipe. The outer diameter of the washers is slightly smaller than the inner diameter of the muffler body. After this I wrap it with a thick layer of basalt wool. Next, I tightly wrap the basalt wool with tape so that the diameter of the “cigar” becomes equal to the internal diameter of the muffler body and the cigar is pressed tightly into it.

Installing an additional resonator

The resonator must dissipate low-frequency sounds. In case of dull noise, this action will once again dampen the sounds, which makes the machine operate quite quietly.

Another resonator is mounted between the base resonator and the muffler. It is installed in the area where the base resonator was located. This new resonator must have sound-absorbing material. It should fill its internal space.

The sound of a running machine can be reduced as much as possible by installing an additional final muffler. This type of noise reduction device is a specific can, which is crossed by a pipe with holes, and the rest of the sound reduction mechanism is saturated with heat-stable soundproof fiber, which is fixed with a fine mesh. This system for reducing the intensity of a sound wave is called an absorber .

The area for mounting another muffler should be the area between the catalyst and the standard muffler. To attach another sound reduction device, cut a piece of pipe of the required size between the base muffler and the catalyst. Fit the muffler to the resonator using strong clamps in combination with asbestos sheets to create gas-tight joint walls. The sealing must be done very carefully - a missed gap will lead to a lot of noise.

As a result of these actions, when sound waves move through the installed muffler, it is absorbed by the porous substance, which will help reduce the noise from the operating machine. A sound wave, reaching a porous substance, provokes vibrations between different fibers and, appearing during this friction, is transformed into thermal energy. Consequently, sound vibrations are converted into heat. A significant advantage of such a noise reduction device is that there is no need to increase the length of the exhaust system.

Exhaust system design

Technology for creating and mounting an additional resonator:

1. Creating a body (barrel) from a fragment of a steel pipe. It should have thin walls. You can also use two halves of sheet steel;
2. Creating holes in a certain area of ​​the exhaust device pipe behind the base resonator;
3. A combination of body halves on a pipe with holes. Then they are scalded;

4. Placement of basalt-based mineral wool into the hollow space of a newly created body;
5. Welding the ends of the resonator;

6. Adaptation of the ignition and fuel delivery system. This must be done due to transformations in the exhaust pipe.

Upon completion of all production operations, the welds must be cleaned, and the part that was made must be painted. It must be chosen very carefully. It must be very resistant to temperature fluctuations.

After installing the additional resonator, the ignition system and fuel supply should be tested. You need to realize that all changes to the exhaust system will affect the engine. It will be very annoying if, by reducing the volume of the running engine, you are forced to increase fuel consumption or reduce the power of the car. When choosing a method by which you will create a silent muffler, take into account the difficulties associated with it. It is especially necessary to know that absolutely all methods of producing a silent exhaust system increase the severity of the mechanism.

Therefore, the car owner must strengthen the brackets and rubber shock absorbers. Always be aware of the changing balance of incoming air and exhaust gases into the engine. When upgrading the exhaust device, do not forget about the need to thoroughly test the engine's capabilities at various speeds. It is also worth carrying out additional adjustments to the fuel supply and air separation devices.

How to make an exhaust pipe quieter Izh Planet

Fans of Soviet motorcycles,
well, regarding glass wool, I agree that it soon becomes unusable, and some things cannot be avoided, soot, the plasticine that remains after the mineral water pollutes the entire exhaust tract to death

But what concerns the alteration of the flute, yes, there are actually a lot of small holes, but again there is carbon deposits in the standard version of the flute once a season, since everything gets dirty, and with small holes, I think I will have to clean it more often, but the sound is quieter

I just never tried to make the planet quieter, in my case I wanted to make an exhaust so that it would not choke the engine without reducing engine life and reduce carbon deposits as much as possible.

Evgeniy, I completely agree with you that no matter how bad it is, carbon deposits cannot be avoided, it not only settles in the exhaust system but also in the piston system and, at the same time, not only sticks to the piston and head, but also from time to time comes off from them and tears the liner.

The idea with flutes is worth trying, but the front part of the muffler up to the partitions should not be touched, although it is a noticeable, but still tuned resonator.

Source

Installation of a resonator with an absorbing filler

Instead of the basic resonator, another one is installed, equipped with sound-absorbing material inside. Basalt fiber is most often used as a filler. This method is the most expensive.

To replace the resonator with a new one, you need to cut out the old part, insert the resonator with filler in its place and weld it on both sides.

Replacing the old resonator with a new one

Tags: homemade silencer Planet 5

Comments 29

yes there is no video, the sound is a little clearer than the original and louder)

no offense, but this guy's look is just terrible

Well, what if it’s already 20 years old, your friend wants to convert it into a chopper in the spring, I’ll help, post photos as soon as possible

so Kent and I collected from a pile of garbage! =)) we got into our hands a frame on wheels, a rusty tank and a motor in a bag without a cylinder and a shaft elbow =)))

Well, I was the first to watch it)

Damn, I’m wondering why and when I signed up for this amazing thing =)))

plus to my colleagues. The resonator at 2T is an important thing and needs to be calculated.

except for the appearance - natural stupidity. In old motorcycle magazines, I don’t remember the number, there was an article about calculating the resonator of a two-stroke bike, I advise you to look for this article.

on the 5th planet, the welded resonator should ideally be 1.5 meters long) but how to put it there is another question, so you shouldn’t touch it, it was a drain plug)

Yes, it's just a change in appearance and nothing more, my friend said I did it. I plan to bring the resonator to the top in Minsk like on a cross-country, we’ll think about it there!

there is no traction there, read the theory of a 2-stroke engine

I agree, a 2-stroke motor needs a tuned resonator, which is designed for a specific motor. Even the native P5 had more or less... What is the current consumption?)))

You’re right, at one time I was involved in boosting Soviet motorcycle technology, even now the fallen Jupiter is in the garage)))

Differences in exhaust systems of domestic and foreign cars

It must be taken into account that absolutely all cars manufactured abroad are equipped with massive elements of exhaust gas elimination devices. Their design is due to the fact that the metal used helps reduce mechanical vibrations of the engine, and thanks to this, the exhaust device is almost inaudible.

In addition to thick metal walls, the muffler mechanisms of foreign cars are equipped with a large number of labyrinths and chambers. They should reduce the release of exhaust gases. The designs manufactured in our country are simpler, and therefore our cars are less comfortable.

Improving the exhaust gas removal device will invariably increase the weight of the resonators, muffler and pipes. It is necessary to strengthen the devices of the supporting brackets, and change the shock absorber to a more powerful one.

Minimal background noise, a low degree of engine vibration, as well as moderate exhaust dispersion indicate that the installation was carried out correctly. After completing all work, it is necessary to adjust the air filter and fuel injection system.

When choosing a method to use to make the exhaust quieter, you must be very careful and take into account all the nuances. After all the work is completed, the comfort of your car will increase. This will reward you for all your troubles.

Characteristics of the IZH-P5 motor

What is the value of this model

Such increased attention to the IZH Planet 2 model is caused by the fact that:

1. in total, just over 246 thousand were produced;
2. and there are few surviving copies left;
3. which only increases its value among collectors.

According to Izhmash, only 246 thousand Planet 2 models were produced throughout the USSR.
Therefore, it was a great success to find preserved motorcycles in garages and sheds of villages and towns (as in the photo below). Moreover, if the previously discussed price has not changed, and the owners give you a bag of spare parts in addition, consider that you have hit the “jackpot”.

Fortunately, you can still find “live” IL with original parts. True, only in this state

Izh Jupiter 5 ignition switch connection diagram

We mark the Hall sensor mount in such a way that the distance to the rear wall of the sensor through the magnet slot from the center of the armature is around mm. What advantages open up to users who decide to install electronic ignition on the Izh Jupiter are described below. Get a nightmare! Thanks to the modulator plate, smooth ignition operation is ensured.

What kind of precise engine operation can we talk about here? An ignition adjustment is necessary if the engine is running poorly, the muffler or carburetor is firing. As soon as the voltage is on the pin. A caliper will be needed as a depth gauge. The most common of them are listed below: Ignition gaps change their original position while driving a few days after adjustment; A spark occurs every once in a while, since the contacts regularly burn out; Capacitors are constantly damaged; Low spark power; If you add two or three volts to the battery, it is quite difficult to start it. If the engine is 1-cylinder, then the cutout angle in the modulator should be approximately degrees, but if the engine is 2-cylinder, then the cutout angles should be 60 degrees.

Its thickness is 0.45 mm. We connect the second wire from the switch to terminal “1” of the ignition switch; the second wire from the same terminal goes to the signal. Tighten the screws well.

Replacing the head light Riding Jupiter 5 at night is the lot of the most daring and experienced bikers. Thus, the coils are supplied with 12 volt voltage from the battery (diagram 1). The ignition timing must match on any cylinder used. If your spark appears earlier or later, then perform the following steps. We determine the moment of spark by the spark itself.

Connect it to the second and third contacts of the DC. After turning on this key position, power is supplied from the battery to the primary circuit according to a simplified scheme. Now you can use BSZ. Then loosen the screw and turn the eccentric. As a result, a charge of less than 12 V appears on the spark plug, which poorly ignites the combustible mixture in the cylinders.

A discharge is applied to the spark plug, which causes the mixture to ignite, causing the crankshaft to start moving. Using the generator bolt, turn the crankshaft clockwise. It is necessary to ensure that the breaker contacts open to the maximum distance. The characteristic knocking sounds of iron components in the crankcase and accompanying detonations also disappeared. WIRING TO IZH (PLANET 5)