The quietest muffler for a car with your own hands. How easy is it to make a straight-through muffler yourself

The muffler is an element of the engine exhaust system. Its presence does not depend on the type of fuel on which the engine is running - gasoline, diesel fuel or methane. The muffler dampens sound vibrations, helps damping, damping and resonant reduction of engine exhaust sound waves. The interlocutors will not be able to communicate near a running engine without a silencer. The noise of the motor will drown out their speech. Nevertheless, many car owners dream of redoing exhaust system and make a straight line. Some people can create it with their own hands.

Types of mufflers and their differences

There are 4 types of silencers according to the method of absorbing acoustic waves:

• reflective;
• restrictive;
• absorption;
• resonator.

By design:

• straight-through;
• reverse flow.

The scheme of the reflective reverse flow, the rest - direct flow.

reflective

If one muffler is installed in the car, then a reflective version is used. It uses the principle of "breaking" the flow exhaust gases by creating several partitions, expansion chambers and turns. The volume of the exhaust is reduced to standard values. For this reason, the vast majority of factory cars are equipped with a reflective type.

Most popular for car factory configuration

The disadvantage of this type of muffler is the reduction in engine power due to the resistance of the exhaust system to the flow of exhaust gases.

resonator

For exhaust system powerful engines a resonator silencer is installed as the first stage. It consists of a perforated pipe placed in a housing. The body is divided into two or three sections. The energy of the exhaust gases is weakened by a stepwise decrease in pressure.

installed as the first stage of exhaust energy damping

The part reduces the strength of sound vibrations and maintains engine power with a free flow of exhaust gas flow.

Restrictive

In restrictive mufflers, the flow of gases passes through a diaphragm or cone, which leads to a decrease in engine power. The acoustic protection of such devices is low, since the diaphragm does not prevent the rectilinear motion of the sound wave.

Absorption

The damping function for sound vibrations in the absorbing muffler is performed by a finely porous non-combustible material located in the space between the perforated pipe and the housing. The design is similar to the resonator type. This type has little effect on power reduction.

Do-it-yourself replacement of a reverse-flow muffler with a direct-flow one

In the manufacture of forward flow, it is advisable to use positive properties structures of several types.

Reasons for replacing a standard muffler with a straight-through one

Car owners change the factory muffler to forward flow for several reasons:

• obtaining an increase in engine power;
• subjective improvement in the acoustic parameters of the exhaust;
• improving the aesthetic parameters of the car;
• complete modernization of the exhaust channel;
• the installed muffler is out of order.

Tools and materials for work

A straight-through muffler is often bought, but for lovers of tools and an irrepressible thirst for creativity, we recommend making it yourself. Parts are preferably made of stainless steel with a thickness of 0.8–2.0 mm. Select blanks from ferrous metal with a thickness of 1.0–1.5 mm for the body, the rest 2.0–4.0 mm to avoid premature burnout of parts, and also use blanks from the standard. Suitable sizes are used for the case: a fire extinguisher, a thermos, an empty gas or scuba cylinder.

A non-combustible porous material or a combination of them is used to stuff the silencer chamber:

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

Tools:

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

Modification of an old muffler

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

   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 keep the juicy bass rumble from the engine during the exhaust

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

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, and increasing it is incommensurably more difficult.

cut the length of the pipe to the desired size

We put metal nets for the kitchen on the place of perforation of the pipe.

cover the internal perforation with finely porous non-combustible material

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

we strengthen perforation, reducing its permeability for mineral wool

We coordinate and clean the places of welding, weld the perforated pipe to a regular place.

welding is carried out in compliance with all safety rules

All free space inside the muffler is densely filled with the selected filler.

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

Working with mineral wool requires individual funds protection.

the absence of a metal mesh between the holes and the wool will lead to a faster "blowing" of the wool from 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 an aesthetic appearance, paint heat resistant paint in your favorite color.

2. We mount on the car. We start the engine. We rejoice!

To make the muffler last longer, we drill one or more holes in the body with a diameter of 1.5–2.0 mm for condensate outflow. The vehicle must be level to determine the low point.

Muffler video

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

Video: how to make a do-it-yourself muffler

Another good example making a muffler from scratch. The forward flow version is made of stainless steel with two exhaust pipes.

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

How to make forward flow quieter

To reduce the volume of the exhaust, devices are used that reduce the flow area of ​​the exhaust pipe of the muffler. Consider the damper and flute commonly used on cars.

Damper installation

The damper is installed either before or after the muffler. The co-current exhaust volume will be clearly reduced only when the damper is fully closed. Technological gaps of 3-5% remain for the passage of exhaust gases - so the engine does not stall. In this regard, the engine power is significantly reduced due to the overlap of the exhaust system.

damper made by hand

A damper is also used to switch from a direct-flow to a reverse-flow muffler and vice versa if necessary. In this case, a new muffler is installed parallel to the old one, and the damper is mounted in front of them. This scheme is already used on some brands of cars from the factory.

mechanical adjustment of the damper is carried out on the go by the driver from the cab

It is possible to drive a short distance with the damper closed, but driving constantly is unacceptable for the engine.

damper installed in front of muffler

Making and installing a flute

The flute (silencer) has more preferred features. It muffles the clearance of the exhaust pipe much less than the damper. You can buy a flute, knowing the inner diameter of the outlet pipe, or you can make it yourself. Various designs of the silencer are shown in the photo.

factory models

Flute mounting options

Possible variations of the flute.

spanners.

It is more correct to choose blanks from stainless steel with a thickness of 0.8–1.2 mm, which guarantees a long service life. Blanks from "ferrous" metals are acceptable with a thickness of 2.0-2.5 mm or less if we plan short periods of operation of the flute. We use two pipe cuts and sheet metal for the flange as blanks.

Making a flute with your own hands

The order of work performed:

flute videos

Video: exhaust sound through forward flow without a flute

Video: sounding a flute on the same car

Noise standards and liability for exceeding them

Responsibility for the loud exhaust of the muffler is provided for under Article 8.23 ​​of the Code of Administrative Offenses. The driver is involved for the operation of the machine with an excess of noise level according to Technical regulations Customs Union 018/2011 "On the safety of wheeled vehicles" paragraph 9.9.

Table: dependency limit acceptable level sound from vehicle category

Category M1, N1 and L are cars having no more than 8 seats, trucks with an authorized maximum weight no more than 3.5 tons, motorcycles/mopeds/quad bikes. Category M2 and N2 are vehicles with more than 8 seats (excluding the driver) but with a maximum mass not exceeding 5 tons, and trucks with a maximum authorized mass of 3.5 to 12 tons, respectively. Category M3 and N3 are full-fledged buses and trucks with a maximum permissible weight of more than 12 tons (trucks, most dump trucks).

According to 12.5.1 of the Code of Administrative Offenses, the driver (or owner) is involved in making changes to the design of the car without the permission of the supervisory authority - the traffic police.

So, a fine for a forward-flow silencer can be either a warning plus a fine of 500 rubles, or two fines of 500 rubles each (two warnings cannot be issued in practice).

Manufacturing straight-through muffler and its further improvement is within the power of most motorists. Despite the restrictions on the operation of such devices in our society, there are more and more people who want to make their own hands and install a direct-flow muffler on a car. Thanks to detailed instructions with photos and videos, it will be much easier to make a forward flow.

The muffler is necessary to reduce the noise generated by the flow of exhaust gases, effectively blocking their path. And ideally, there should be no barrier to exhaust gases from the cylinder.

Quieter car muffler

To begin the fight against excessive noise produced by the car, launch an offensive on all fronts. Before you take decisive action, you must clearly understand the work of the exhaust system of the car engine. After all, the engine and exhaust system are balanced with each other so as not to interfere with each other's work. And disrupting this balance can lead to wrong work engine.

Use the simplest method to reduce noise - install a "can" (as motorists call an additional final muffler). It is made of a body through which a pipe with holes passes. The body is filled with a filler made of heat-resistant fiber, fixed with a fine mesh. It is installed between the catalytic converter and the standard muffler.

Cut a pipe section between the catalyst and the muffler of the required length, corresponding to the length of the "can". Remove the muffler. Install and attach the "jar" to the resonator, using zip ties and sheet asbestos to seal the joint.

Install the muffler in its original place, docking with the "can", using, again, clamps and sheet asbestos to seal the joint. When installing a “can” or an end silencer, it is necessary to carefully seal the pipe joints with heat-resistant asbestos in order to prevent exhaust gas breakthrough, which will create elevated level noise.

An additional effect in reducing noise will be given by replacing the resonator installed on the car by the manufacturer with the same “can” with a heat-resistant filler. The replacement of the standard resonator can be carried out according to the same method.

You can also try another way to suppress noise - replace the exhaust manifold with a specially designed manifold. Unfortunately, this method is associated with the difficulty of acquiring such a spare part for certain car brands. These are the basic ways to quiet muffler on the car. If you know others, we are happy to wait for your comments.

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 only be comfortable when as little as possible penetrates into the passenger compartment. extraneous sounds. The muffler creates its own noise background, which can be significantly reduced. The effect of this cannot be overlooked.

Basic ways to make a muffler quieter

Before proceeding with the modernization of the exhaust system, you should understand the nature of the increased exhaust sound. With each stroke of the piston, a microexplosion occurs in the combustion chamber of the engine cylinder, which is accompanied by a significant sharp expansion of gases. Naturally, a peculiar 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 the expansion of gases;
• vibration noise from the exhaust system.

As you know, the main way to deal with noise is to increase the weight of the elements. The thicker the metal, the less vibration and, accordingly, the noise. Therefore, the exhaust manifold, which is the first to take on hot gases from the cylinder head, is made so massive. Many motorists who have had the opportunity to compare the weight of the exhaust pipe domestic car and foreign, noted that the details of the exhaust system of foreign cars are much heavier. That is why "our" cars are less comfortable in sound-noise comparison.

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

Do-it-yourself quiet muffler, video:

We make a quiet muffler with our own hands

Taking on the modernization of the exhaust system in order to reduce the sound of the exhaust, you should be prepared technically and financially. To work, you need a full set of cars metalwork tool. In addition, you will definitely need:

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

One of the easiest ways to get quiet muffler in the conditions of an average garage, is the inclusion of an additional resonator in the existing exhaust system.

There are also two options for upgrading the exhaust system: installation in the area between the main resonator and the muffler of an additional factory-made resonator 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 in the budget, then you can safely buy a new resonator, cut out part of the pipe and weld it into the vacant seat. The second method turns out to be more fascinating and should be discussed in more detail.

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

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

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

Video, what is an exhaust manifold and a resonator?

Additional Quiet Car Problems

After the question of how to make a quiet muffler is resolved, some problem areas. First of all, it should be remembered that any of the methods for manufacturing a “quiet” exhaust system will necessarily lead to an increase in the weight of the structure.

This, in turn, obliges the motorist to accept 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.

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How to make mufflers quieter? | Articles, reviews - all about exhaust systems

If you want your car to run quieter, then in such a situation, you should make some changes to the exhaust system. It is she who is responsible for damping the sound wave that occurs during engine operation. It should be noted that we are talking about a standard exhaust system and a muffler, and not a direct-flow one, since these two systems are quite different. And yet, we will not consider options when the internal structure of the muffler is completely changed and redone, a lot of welding work is carried out, etc., here we will talk about conventional methods.

How to change the sound from the muffler to quiet?

There are several easy ways to make a muffler quieter.

To do this, you will need to do one of the following actions, namely:

• install an additional resonator;
• replace the resonator with a new one having a sound-absorbing filler;
• replace the muffler with a new and high-quality one.

Any of these options can make the muffler sound quieter. It remains to comment on the points, and let's start with the last one.

Silencer replacement

If you have not changed the standard muffler in your car for a long time, then it by itself can work in the mode increased noise. Why is this happening? From corrosion processes, from elevated temperature over time, perforated sections of pipes and parts of partitions inside the muffler can begin to burn out, sound reflectors become unusable. All this changes the picture of sound absorption not in better side. And often the problems with excessive noise from the operation of the car lie in the loss of their properties by the muffler.

If you are changing a muffler, then buy a product from trusted brands, with the proper thickness of steel on the can. The muffler must exactly match your make and model of car, taking into account technical parameters engine and overall dimensions.

Installing an additional resonator

To reduce noise from a car, a strategy such as installing an additional resonator is sometimes resorted to. As you know, the resonator in the exhaust system is responsible for damping (scattering) low-frequency sounds, especially peak ones, in the sound wave, and the muffler completes the rest of the work. If the noise from the car that you would like to eliminate has low (bass) notes, then installing an additional resonator will allow you to dampen low sounds a second time, which will positively affect the overall picture.

An additional resonator is installed between the main resonator and the muffler. For this:

• cut out a part of the pipe between the main resonator and the muffler;
• weld (mount) an additional resonator in this place;
• adjust the ignition system and fuel supply due to changes in the exhaust system.

The latter is worth checking as any changes to the exhaust system will affect the engine. It is unpleasant to get a decrease in power or an increase in fuel consumption as a result of the pursuit of silence.

Installation of a resonator with an absorbing filler

IN this case, instead of the main resonator, a new resonator is installed, having a sound-absorbing material as its filler inner space. With this design, in addition to low frequencies, any other noises will be compensated and muffled, which will have an excellent effect on the overall sound picture from the operation of the car. Such a resonator design is similar in structure to a straight-through muffler, and it does not create unnecessary resistance to the movement of exhaust gases. The filler material most often used by manufacturers is basalt fiber. He holds up very well high temperatures, and does not lose its properties for a long time.

The only drawback of such a resonator is its price compared to the standard model, however, it does an excellent job.

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Quiet do-it-yourself forward flow with a flute or damper

It is difficult to imagine a sports or tuning city car without a straight-through muffler. The noble roar of the engine pleases the sensitive ear of the owner, awes the girls, causes envy and admiration of friends. However, the neighbors do not always like this, and the traffic police prefers a quiet forward flow. This is where the question arises for the driver: what to do to muffle it, what methods are used to make the exhaust quieter.

Why do we need forward flow and why sometimes it needs to be muffled

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

Having decided to muffle the forward flow with your own hands, you need to clearly understand the principles of operation of the agreed release, and determine the purpose of the car tuning performed. Improving dynamic performance occurs only through the installation of a new "spider" - the exhaust manifold. The remaining components of the exhaust system simply should not create resistance to gases and have a bad effect on the result.

At correct setting, the resonant exhaust gives an increase in torque of 3-9% for atmospheric, and more than 10% for turbocharged engines. But in production cars, an increase in the cylinder filling rate working mixture with modernization less than 2-3%.

Installing a straight-through muffler on conventional stock cars is only needed as a decorative option for a pleasant exhaust tone. Main criterion the quality of the forward flow on a serial machine is the euphony and velvety noise of the motor, and not the increase in power. Louder or quieter will the car yell - at high speeds and dynamic characteristics it won't be reflected. In this case, when there is an urgent need to drown out the forward flow, you can do this without thinking about the consequences.

What is a flute in a direct-flow muffler, and what is the effect of it

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 a perforated tube 180–250 mm long and a little more than 1/3 of the exhaust in diameter, 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 the exhaust gases exit through the perforations, the following occurs:

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

The correct name for this flute is silencer (from the English silencer - silencer), and it is included in the kit expensive systems exhaust, which are sold on the Internet. Can also be purchased separately average price good European models cost 70–150 dollars, and mass ones from the Celestial Empire - from 450 rubles.

Do-it-yourself flute for direct flow

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

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

When manufacturing, you should try to carefully measure the inner diameter of the muffler at the air cut so that the plug does not fit tightly, but without a gap. Then, when leaving the track, you can quickly remove the flute from the hot pipe with a pair of wrenches or pliers.

It is important to remember that any obstruction in the exhaust pipe, including a silencer, will inevitably reduce engine power. To make it quieter and muffle it without loss will definitely not work.

Forward flow with damper

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

When the engine is running at low speeds, when the advantage of a coordinated exhaust is not used, the exhaust gases exit through a conventional muffler, and the direct-flow is closed by a damper. On optimal speed the damper opens the output to the 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 does not differ much in sound from the stock car, and on the highway it not only sounds like a tuning car, but has a real increase in power. It's not cheap - full automatic, complete with a titanium "spider", the price often exceeds a couple of thousand dollars.

Similar in capabilities, but not very famous analogues cost moderately, but it is better to select the appropriate option with a specialist - the knowledge of a mechanical engineer may be required for the success of such an upgrade.

A budget option forward flow with a damper can also be independently welded from improvised materials. The upper part from the old carburetor is suitable for the damper, if you bring the idle cable into the passenger compartment. It will take much more effort and time to make such a design with your own hands than for a home-made flute, and the result of the installation cannot be predicted in advance. Mute the sound is easy, but to save power, even if you're lucky, you have to tinker with the setting.

Conclusion

Whichever exhaust muffling option you choose, you should understand that you can just buy turnkey solution, if finances allow, but you can drown it out with your own hands by making a device from improvised means.

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Direct-flow muffler, do-it-yourself muffler tuning. How to make muffler tuning. We make a straight-through muffler with our own hands.

Installing a straight-through muffler is one of the easiest ways to draw the attention of others to your car. The loud "growl" sound that comes from the bosom of the exhaust system has always been common, both among owners of tuned vehicles and among owners of simple cars. More on this later in the article.

• Quiet straight-through muffler
• Pro tips on how to get the right muffler sound

Muffler tuning, which can be done from the technical part of the car with your own hands

Thanks to the installation of a straight-through muffler, a loud bass sound is formed that attracts the attention of others and makes your car stand out from the stream of other cars. In fact, the installation of a straight-through muffler is done just for the sake of it.

However, not every car owner has the necessary amount of money to install a professionally made forward flow, which is why many drivers create a direct flow muffler on their own, which, in fact, is quite simple.

Straight-through muffler, differences between a straight-through muffler and a stock muffler

If we consider the main purpose of the forward flow, then it is worth noting that it removes exhaust gases from the engine much faster, which, by the way, is also tuned. A conventional exhaust system significantly limits the tuned engine, and a straight-through muffler makes it possible to increase power. However, in our case, we should only count on the appearance of a loud "sporty" sound. Even if the increase in power does occur, it will be insignificant and it is unlikely that you will be able to feel it while driving.

Direct-flow muffler, advantages

The advantages of a direct-flow muffler include:

1. Powerful growling sound.
2. Rapid removal of exhaust gases from the internal combustion engine.
3. Slight increase in power.

Straight-through muffler, disadvantages

Firstly, you will not be able to honestly pass the inspection. However, this has not been a problem for a long time, especially after the abolition of the traffic police mandatory passage THAT. Insurance companies sell MOT even in spite of the car.

Secondly, it is likely that a strong sound will annoy the people who surround you, especially in your yard if mothers with children are walking there and so on.

The third important disadvantage is that after making such changes to the design of the exhaust system, there will be an increase in fuel consumption. And although it will be insignificant, for some car owners it may still come as an unpleasant surprise, especially given today's fuel prices.

There is another factor that is much more significant. After installing a straight-through muffler, it is quite possible that you will be disappointed due to the discrepancy between the end result and the expected one.

Surely, many have heard the sound of cheap direct currents mounted on domestic cars. If, after exhausting and long work, you get the same thing, you will be rather unpleasant. And that's putting it mildly. Therefore, if you are without experience, you take on this work, it is likely that you will have to redo everything several times.

Tools, fixtures, consumables for work

We make a straight-through muffler from a standard muffler with our own hands, step by step

The whole process consists of three stages:

We will not focus on the first stage, since everything is more or less clear here. You just need to remove the old muffler from the car. Next, we study the design of a regular muffler, after which, making some changes, we calculate the design of the forward flow.

How to fill a straight-through muffler

First, we cut out the body from the old muffler and open it. Then we remove all the internal components, with the help of which the sound is muffled. After that, it is necessary to connect by welding your old pipe and a pre-purchased new one, which should have a large diameter. Next, we weld all this into the body, which remains from the old muffler.

Quiet straight-through muffler

Externally, in fact, nothing needs to be changed, otherwise it will be difficult to attach a silencer to the bottom, although sometimes more serious changes are made, but for the first time it is advisable not to complicate your task.

If you don't like how the part of the pipe coming out from under the bottom looks like, change it with special nozzles. They are sold at any auto shop.

Do-it-yourself straight-through muffler from a perforated pipe, step by step

It must be taken into account that the temperature in the exhaust system is quite high, as a result of which a pipe made of heat-resistant steel should be used for forward flow. Otherwise, it will burn out very quickly.

Silencer soundproofing, or how to make a straight-through silencer quiet

To form a powerful sound and isolate the elements of the machine from heating with a silencer, you need to wrap the welded structure with heat-resistant sound insulation. The denser the shell, the stronger the sound will become. From above, the insulation must be closed with a stainless steel sheet, which is pulled together with steel clamps.

After that, we fix the entire structure to a regular place. However, as a result of the body being slightly thicker, the muffler holders may need to be modified. They may need to be digested.

Naturally, you should not expect that you will get the same sound as professional straight-through mufflers, since they use completely different technologies and materials. However, the sound of your car will be noticeably improved.

In this case, the main thing is to be able to cook well. If you can’t get the sound you want the first time, don’t be discouraged, it’s not so difficult to redo everything. More information you will find out in the next video.

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A small part of car enthusiasts would like to have a sporty loud exhaust on their car. Another overwhelming majority of drivers are puzzled by the question of how to make a quiet muffler. Comfortable ride in vehicle when few extraneous sounds penetrate into the interior of the car. The muffler creates a background noise, but it can be reduced and the effect that you get will not be missed.

How to make a quiet muffler with your own hands

Before proceeding with the modernization of the exhaust system, let's figure out why there is an increased exhaust sound. In the combustion chamber of the engine cylinder, with each stroke of the piston, a microexplosion occurs, it is accompanied by a sharp expansion of gases after the blast wave has done its job, moved the piston down, opened Exhaust valve and rushed through the exhaust system.

The exhaust system has a dual nature of noise:

1. noise from the vibration of the elements of the exhaust system;
2. sound from the fact that the gases are expanding.

To combat noise, increase the weight of the elements. The thicker the metal, the less noise and vibration. For this reason, the exhaust manifold is the first to receive hot gases from the cylinder head, it is massive. Many car enthusiasts had the opportunity to compare the weight of a foreign and domestic car, they noted that the parts of the exhaust system of foreign cars are much heavier. For this reason, "our" cars are less comfortable in sound-noise comparison.

In the exhaust pipe, special elements - mufflers and resonators - will help reduce the speed of gas movement. The resonator is first in the queue. Under pressure, gases enter the enlarged part of the pipe, where they lose part of their energy and move on with less momentum. Traffic fumes in the muffler labyrinth system completely lose energy and dissipate. On a foreign car, a quiet muffler has some separate housings.

What is a resonator and exhaust manifold

If you are going to upgrade the exhaust system, in order to reduce the sound of the exhaust, you need to be prepared financially and technically. We need a set of locksmith tools for the driver. In addition, you will definitely need:

1. a workbench that is equipped with a vise;
2. angle grinder and a set of discs;
3. welding machine (better inverter or semi-automatic).

Most affordable way in the conditions of an average garage, to make a quiet muffler - you need to include an additional resonator in the existing exhaust system.

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

When considering the issue, it must be borne in mind that any option will entail different costs. If a car enthusiast has an unlimited budget, then you can buy a new resonator, then cut out a part of the pipe and weld it to the vacated space. The second method is more exciting and we will talk about it in more detail.

The manufacture of an additional resonator consists of the following steps:

1. a body (barrels) is made from a piece of sheet steel or a thin-walled steel pipe in the form of 2 halves;
2. on a section of the exhaust system pipe, which corresponds to the length of the body and is located behind the main resonator holes;
3. connect the halves of the body with the holes on the pipe and scald;
4. lay basalt mineral wool into the cavity of the new building;
5. weld the end parts of the resonator.

In conclusion, process the seams after welding, clean them, degrease the new resonator, if possible, then take it and paint it with heat-resistant paint.

Additional problems quiet car

When the issue is resolved and a quiet muffler is made, problem areas become obvious. It should be remembered that in the manufacture of a "quiet" exhaust system, this leads to an increase in the weight of the entire structure.

As a result, the motorist takes additional measures to strengthen the rubber shock absorbers and brackets. You also need to consider that the balance of exhaust gases and incoming air into the engine has changed. After the exhaust system has been upgraded, it is necessary to test the engine in different modes and make additional adjustments to the air filtration and fuel supply systems.

Forward flow is an opportunity to increase the power of the car's engine, add aggressiveness to the car and improve the jerk. You can assemble and install it with your own hands, having studied the step-by-step instructions.

About cocurrent or SG

The direct-flow muffler (PG) is an improved alternative to stock exhaust, which is not able to provide a quick and timely exit of gases from the engine (ICE) system. The regular exhaust system suffers (chokes) especially after installing a sports camshaft or after boring cylinder head(in other words, on a forced motor).

PG is designed to modernize the exhaust system, in which the emission of gases is increased. In addition, a properly installed SG will provide an increase in ICE power by 10–15 hp. However, one must be prepared for cardinal changes: it will be necessary to replace everything, starting with the catalyst and ending with the tip.

Power increase power unit with the help of PG, unfortunately, it also has " reverse side medals”, associated primarily with a loud sound attack of the order of 120 dB. This is the norm for sports cars, but for civilians, it is unlikely. And this explains the mass of cases of fines issued by law enforcement inspectors to the owners of such cars.

To minimize this upgrade flaw, craftsmen use various ways sound reduction. Installing a flute silencer, an oval or round resonator are all varieties of methods to improve the performance of a forward flow silencer. Quiet make it can "form and content."

For example, craftsmen say that a square resonator installed in the middle of the track (the way gases exit into the aircraft) reduces noise much better than an oval or round one. And in general, it’s better not to put a round one, but use an oval one as a last resort, since it has a larger volume of cans and, accordingly, a quieter sound.

Before understanding thoroughly what GHG is, one should recall the functioning of the car exhaust system. Many motorists do not even suspect how many tasks it performs, although it does not seem so at first glance.

Of course, the main task of the exhaust is to remove gases. But not less important function- ensure timely and high-quality ventilation of the internal combustion engine cylinders.

Cylinder ventilation is carried out as follows. At the time of closing the valves of one ICE cylinder creates a vacuum in the exhaust manifold. It moves through the system high speed, and reflected from the obstacles, returns to the collector. At the time of the release of gases from the cylinder, a reduced pressure is created here, which contributes to better ventilation and purge.

Among other things, the exhaust system (ES) is designed to deal with noise. This is what the muffler is for.

Compared to a conventional, regular muffler, the PG does not have many separate sections inside. Accordingly, it has a more simplified design. It is this fact that allows craftsmen to make it at home, in a garage.

But is it worth it at all for an ordinary motorist to change a standard muffler for a PG? Certainly not. If he does not prefer active driving, does not imply the operation of a car for sports purposes, does not have complexes about a “gray” car that does not stand out from the general auto flow, then he should not carry out modernization.

On the contrary, if the bass and thoroughbred roar of the engine resonates in the soul of a motorist, then the installation of a forward flow must be carried out. Moreover, it provides many advantages of the following nature:

• the power of the internal combustion engine increases due to the increase in throughput;
• the service life of the entire aircraft is extended due to the use of high-quality materials.

As for the disadvantages of modernization, these are:

• problems with the law due to loud noise(can be excluded if the SG installation will be carried out according to the new system);
• possible difficulties with service maintenance;
• high sensitivity of the power unit to low temperatures;
• clearance reduction.

Do not confuse forward flow with a muffler. The fact is that the entire exhaust system is called forward flow, and in most cases only part of it, the muffler, is upgraded.

What is required to build a CSG (direct-flow exhaust system): tuning kit

Undoubtedly, the installation of PG is tuning, modernization. And everything you need to build such a sports version of the exhaust is available in stores.

The first is the resonator. Note that the sports PG does not have partitions that prevent the release of gases. Its entire design is aimed only at ridding the internal combustion engine of excess gases generated during the combustion process. As a result, power increases due to increased blowing.

An interesting point. On cars equipped with an atmospheric internal combustion engine, the installation of a sports PG allows you to increase power by 10 percent of the standard power, and on turbocharged cars - by 20 percent or even more.

The second necessary element, of course, is a new straight-through flame arrester. The universal damper is designed as an alternative to the standard catalyst when building a forward flow. Such an element must be made of stainless steel (sometimes aluminized). Inner part of such a flame arrester has a universal design, designed to increase the power of the power unit of the machine.

Fasteners and other accessories, which must include various adapters, adapters, flanges, thermal tape for the exhaust manifold, etc., are also part of the system.

And finally, the pipe for the muffler, made of stainless steel or aluminized. The pipe itself should be with an increased diameter (usually in the range of 38–76 mm). The length of the pipe is about 1000 mm, the wall thickness is 1.5 mm.

DIY PG from handy materials

If it is not possible to buy ready-made tuning kits from the store, then it's okay. It will be possible to make a homemade silencer from handy materials. However, it is not recommended to use old, used mufflers for this, since as a result of repeated heating cycles, the metal loses its original properties.

stainless steel

Stainless steel GHG is the most expensive way to upgrade the exhaust, but also more efficient. But if we also take into account the high rates of protection against aggressive environments, then this option can last for many years, and thus save money.

To make a homemade PG from stainless steel, you need to do the following:

• take a stainless steel tube of the desired diameter (the length is determined by the car model);
• put on it a few metal brushes (sold in stores called "metal sponge");

• wrap the pipe with pieces of thin metal mesh put on sponges;

• you need to wrap tightly so that there are no voids left (see photo);

• after wrapping, secure with wire (steel, not copper!);
• insert such a sandwich into a stainless steel pipe with a thicker diameter or wrap a stainless steel sheet over the wire;
• hammer inside ursu - mineral wool;

• rivet the surface sheet of stainless steel, first making holes in the sheet for rivets with a drill;
• cover one of the holes of the self-made resonator with a mixture of ursa and cement (prepared in the ratio of 1 mineral wool x 3 cement).

It remains only to install fasteners and clamps, put a new system on the machine.

From a fire extinguisher

PG can also be made from other materials. For example, from a fire extinguisher (its frame). The method is not bad, albeit a budget one.

It is advisable to choose a powder fire extinguisher.

Here are some other materials you will need:

• 2 tubes with a diameter of 32 mm or more;
• welding machine;
• metal carver (a grinder is suitable).

Operation algorithm:

• the fire extinguisher is empty of the mixture;
• its diameter increases. central hole on both sides so that 32 mm pipes enter;
• pipes are welded in front and behind the fire extinguisher frame;

• the necessary fasteners are welded onto the resulting resonator (by analogy with the fasteners of an old muffler that is on a car or motorcycle);
• homemade product is covered with protective paint;
• the quality of the welds is checked (they must be treated with anticorrosive).

To check the welds, it is necessary to close one of the muffler holes. Pour water into another. If the seams are not sealed, water will seep through them.

From a thermos

Such a metal thermos can also be used as a material for a silencer.

It will suit both as a nozzle for a PG and as a muffler itself. As you know, a thermos consists of an inner chamber and an outer shell. This design makes it easy to manufacture a silencer - the chamber plays the role of a resonator closed on one side.

The operation algorithm will look like this:

• first of all, you should thoroughly wash the thermos, throw out the cork as unnecessary;
• clean the case from the outside with a metal brush;
• take off back thermos;

• bend the edges, align;
• cut a hole around this circle.

Attention. To make it easy to cut a hole, you need to let the air out of the thermos, and only then cut it out.

We continue:

• on the side of the front of the thermos, it is necessary to punch holes around the entire perimeter every 50 mm for exhaust gases to escape along the outer wall of the thermos to the back (the size of the holes in diameter is 5–6 mm);

• you can punch holes with a sharp chisel, and this is what should happen;

• in order for gases to escape most efficiently, it is recommended to expand the holes by connecting 2 holes into one.

Attention. The holes must be made so that they go beyond the chamber, i.e., inside the outer shell of the thermos.

The muffler or resonator is ready. It can be placed either on the old system exhaust, thereby ensuring forward flow, or assembled on new pipes and components.

How to make a straight-through muffler quieter

PG becomes quieter in the course of its collection. And each craftsman does it differently, using mineral wool, metal shavings, brushes or asbestos. It is also recommended to arrange inside homemade muffler several branches that form additional resonance.

A car with an exhaust louder than 96 dB MOT does not pass, does not cross the border, does not drive around the city. That is the law. Sound today is limited even in motorsport, where it would seem that there should be no limits and limits.

Having decided to mute the GHG, you need to understand that this should in no way affect the efficiency new system. None of the components of the GHG system should create resistance to the exhaust gases.

Flute

The flute or silencer in PG is a simplified design used by tuners. Its task is to “calm down” the PG, having received legitimate dB at the output.

Making a flute is easy. It will be enough to use a piece of a perforated 20 cm tube with a diameter that is slightly larger than the exhaust (by 1/3) as a muffler. A disk or cone washer must be fixed on the pipe to act as a plug. Fastening is carried out on bolts at an air cut. The washer, in fact, creates a shape that resembles a flute.

The cost of ready-made silencers in stores varies between 8-150 dollars. Chinese models They are very cheap, but don't expect quality. Original, good European-made flutes can be purchased for $100-$150.

You can assemble a flute for PG with your own hands. Below is a diagram by which you can easily make such a model.

A homemade flute is assembled simply:

• a 20-centimeter steel pipe is taken (it is recommended to take a stainless steel) and a sheet of iron 1 mm thick;
• welding is carried out (preferably arc);
• Initially, a plug with 8 bolt holes must be welded to the pipe.

damper

SG with a damper is a universal opportunity to simultaneously increase internal combustion engine power and make a quiet forward flow. A design of this type has been known to motorists for a long time, it is even found in the standard version on some BMW models.

The operation of the SG damper is based on the following principle. When the engine is operating at low speeds, gases exit through a standard, conventional muffler. At this time, the steam generator is closed by a damper. But as soon as the ICE switches to high revs, the damper in the steam generator opens, and due to the enhanced ventilation, optimal torque is produced.

The damper is controlled, for example, on a BMW automatically. But manual models are also known.

The price of a finished system with a damper can be high, especially for cars with automatic transmission. Thus, the cost of such a system, coupled with a titanium spider, is about 2-3 thousand dollars.

Analog models are more moderately priced, similar in capabilities to the original ones. However, a successful upgrade of this option may require the specific knowledge of an intelligent minder.

You can also make a damper with your own hands, but there is no way to predict the result of such an installation. It's better not to risk it.

Whichever PG manufacturing option is chosen, one should not exclude finished models and kits. In some cases, it will be much easier to buy them than to fiddle with pipes, welding machine and fillers.