Malfunctions of mufflers on VAZ 2108-2109 and the procedure for replacing them

Many modifications are made to a car to attract the attention of others. Most often these are cosmetic changes, but there is one functional upgrade that is popular among car tuning enthusiasts. It allows the driver not only to express himself to others, but also to improve the power characteristics of the car. We are talking about installing a direct-flow muffler, which is commonly called a direct-flow muffler. In this article, we will look at how to install direct flow on a car, as well as what pros and cons it brings.

The car muffler has failed, what to do?

There are situations when the muffler burns out or even falls off. In this case there are two options:

• The VAZ 2109 muffler is being replaced;
• old one is being repaired.

General view of the exhaust gas removal system

Positions: 1- exhaust pipe; 2 – resonator; 3 – main muffler.

Installing a new muffler

The work is carried out on an overpass or inspection pit. Before replacing elements of the exhaust gas exhaust system, it is necessary to secure the vehicle with thrust bars, placing them under the rear wheels. To replace the muffler you will need:

• new muffler;
• liquid for removing scale on connecting fasteners WD40;
• keys for “13” - two pieces;
• extension for key.

The order in which the muffler is replaced on a VAZ 2109:

• Unscrew the nuts securing the muffler pipe clamp to the resonator pipe.
• The clamp is removed.
• The pipe is disconnected and the sealing ring is removed.
• The rubber suspension cushions are removed. To do this, the muffler must be raised.
• The muffler is lowered to the ground and pulled out from under the car.
• The new muffler is installed in the reverse order in which the old muffler was removed.

Tip: When installing a new muffler, it is best to replace the o-rings with new ones. This will ensure a tight connection.

How to replace the muffler yourself can be clearly seen in the video.

Installing a new resonator

So:

• The resonator pipe is disconnected from the receiving pipe after the clamp is loosened.
• It is removed from the rubber cushions when the device is lifted up.
• In the reverse order in which the old resonator was removed, a new one is installed.
• Under the bottom of the car, the nuts securing the exhaust pipe to the bracket are unscrewed. The bolts securing the bracket to the car body are unscrewed, which is then removed.

Installing a new exhaust pipe

Detaching the bracket from the body

• The exhaust pipe is freed from its attachment to the exhaust manifold.
• The exhaust pipe of the muffler is disconnected from the resonator pipe.
• The sealing ring is removed.

Removing the O-ring

• The exhaust pipe of the muffler is removed.
• The muffler exhaust pipe is installed in the reverse order of removal. The tightening torque for the nuts securing the pipe to the manifold is from 2.1 to 2.6 kgf/m.

Tip: It is better to apply a thin layer of exhaust gas system sealant to the pipe joints before installing them on external surfaces.

When dismantling and installing a new muffler, the places where the coolant leaks are clearly visible. These may be deteriorated, rusty plugs. In this case, it is necessary to replace the VAZ 2109 plugs. The engine parts are most susceptible to wear. Therefore, first of all, you need to replace the plugs on the VAZ 2109 cylinder block.

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Exhaust system malfunctions

Malfunctions of the exhaust system of a VAZ-2109 car are easily determined by ear - by a greatly increased exhaust volume. These faults are divided into two types - repairable and requiring replacement of the exhaust system.

The first includes the breakthrough of exhaust gases through a burnt-out exhaust manifold gasket or through poorly tightened clamps holding parts of the system together. These malfunctions are eliminated by replacing the gasket or tightening the clamps using a special heat-resistant sealant.

Failures of the second type are a consequence of corrosion and lead to the appearance of holes in the muffler or resonator. It makes no sense to brew them or cover them with mastic, because this does not give a long-term effect. Under the influence of corrosion, the metal continues to deteriorate next to the sealed holes and new ones are formed. Therefore, it is better to replace a rusted muffler and resonator immediately.

Types of mufflers for creating dual exhaust

When making a double exhaust for VAZ cars, the correct choice of mufflers is important. Thus, there are types of mufflers for exhaust systems:

• Resonator mufflers are usually made of high-quality perforated pipe with a surrounding chamber. It is the surrounding chamber that provides muffling of noise that has a certain frequency. Sometimes several resonators can be installed.
• The “standard” type muffler is represented by a system of partitions that resemble a labyrinth in their structure. The partitions allow the exhaust gas to be cooled, and when passing through such a system, the sound is significantly quieter. They can be equipped with perforated pipes.
• The third type is direct-flow systems. They also have a noise reduction system, but it is represented by special filters and fibers that are installed in the middle of the pipe itself. That is why the service life of such a muffler is limited by the useful life of the fibers inside the direct-flow muffler.

A special feature of this type of exhaust pipe is that it can dampen engine exhaust sounds quite weakly.

VAZ 2114/2115

There are no innovations in the VAZ 2114/2115 mufflers, the same 4 chambers and three partitions, three perforated pipes and one outlet pipe with an increased diameter.

As a rule, the metal of the outlet pipe rots, and that’s where the rattling noise comes from.

UAZ

Next, let's look at the muffler design using the UAZ Patriot as an example.

First comes the upper housing casing, under which there is a layer of fiberglass.

Inside there are three chambers, separated by two partitions, two perforated pipes without narrowed sections. There are no vibration-absorbing materials.

The inner diameter of the outlet pipe is 52 mm, the inlet pipe is 53 mm. The outer diameter of the inlet pipe is 57 mm, the outlet pipe is 55 mm. Body length 50 cm.

The UAZ Patriot muffler is no longer distinguished by anything special. It makes a lot of noise and rusts inside.

Design Features

All domestic cars have approximately the same exhaust system. This greatly simplifies the issue of self-repair without the involvement of specialists.

The exhaust system (ES) includes several main components.

Main components and fasteners
The entire exhaust system of the VAZ 2109 car is in a suspended state and is held in place by the presence of rubber mounting hangers. The hangers, in turn, are screwed to the bottom of the car.

Popular faults

The exhaust system itself, together with the muffler, is quite reliable and durable due to its simple design.

Frankly speaking, there is nothing to break if you compare the aircraft with the engine, fuel, oil system, and so on.

The most common and unpleasant situation that can happen to an aircraft on a VAZ 2109 is a broken muffler. This is due to the quality of our roads, or rather to their absence.

Removing the additional muffler

The process of replacing an additional muffler is also not difficult; it is enough to understand a little about the essence of this event. To begin with, the main muffler is disconnected from the additional one. In addition, the element is connected to the catalytic converter, which should also be disconnected. This is done using a spanner type wrench. They unscrew 2 bolts.

How to replace the muffler on a VAZ 2108/2109

Depending on the extent of the damage, it will be necessary to remove and replace either the entire element or only some part of it. Each operation is performed quickly and easily, the main thing is to prepare in advance all the necessary tools:

• socket head 13;
• socket wrench 13;
• ratchet;
• flat blade screwdriver;
• WD-40.

How to remove the main muffler

The easiest way to perform this procedure is on an overpass or inspection hole. If possible, you can also use a lift. However, most often, car owners simply lift the left rear part of the car on a jack and dismantle the muffler while lying down.

It is necessary to wait until the exhaust system cools down after a trip, as you can easily get burned if it comes into contact with hot metal. Then you can start working:

• Disconnect the main plug from the resonator. To do this, you need to find the tie (clamp) and unscrew the fastening bolt. If the bolt does not come off, you can spray it with WD-40.
• After the bolt is unscrewed, you need to remove the pipe fasteners and pull the muffler out of the resonator.
• Next, you can remove the hanging elastic bands - usually the main mechanism is easily freed from them.
• The main muffler has been completely dismantled; you need to pull it out from under the car.

Stuck and rusted bolt connections can delay the dismantling process

Removing the additional muffler (resonator)

We will start from the fact that the main plug has already been removed, since dismantling the resonator will require its removal:

• Disconnect the resonator from the exhaust pipe. To do this you will need to unscrew two bolts.
• If the bolts are rusty, you can again use WD-40 lubricant.
• After unscrewing, you need to lift the resonator and disconnect the product from the hanging rubber bands.
• If the rubber bands cannot be removed, you can pry them off with a flat-head screwdriver.
• After which you can pull out the resonator barrel from under the car.

To remove the resonator from the rubber bands, just slightly lift its body and remove the pendants from the hooks

How to remove the exhaust pipe (catalyst)

This part of the exhaust system almost never fails. It connects directly to the exhaust manifold, so before dismantling you will need to jack up the front of the car:

• All the nuts that secure the pipe to it are disconnected from the manifold.
• The catalyst is carefully pulled out from the rubber hangers.

The only thing that can cause difficulty is unscrewing the nuts at the inlet to the manifold. Since they are located next to the engine, they heat up more than the fasteners on the resonator or muffler. Therefore, the nuts can simply stick to the metal.

The catalyst is dismantled very rarely, as it usually does not burn out or become deformed throughout the entire period of operation of the vehicle.

How to install a new muffler

Installation of a new product should be carried out in the reverse order of removal. Usually there are no problems with this procedure. However, the car owner should know the basic nuances of replacement:

• It is imperative to change the reinforced seals in the system.
• It is also advisable to replace the suspension rubber bands with new ones, however, in general, replacement is carried out at the discretion of the owner (if the suspension bands remain elastic and do not have cracks, then they can still be used).
• To replace all bolts, it is recommended to buy products made of bronze and other heat-resistant materials. All parts of the muffler are subject to heat, so the bolts and nuts must be as reliable as possible, otherwise after the first ride they will stick to the metal.

Video: replacing the muffler VAZ 2108–2199

Wiring on both sides

The dual exhaust system is not typical for VAZ 2108–2109 cars. However, if you move the muffler on two sides, you can achieve quieter running and more productive engine operation . Although not all VAZ drivers agree with this thesis:

The double muffler really gives the car a more solid look. In addition, the wear of the pipes will not be as fast, since two devices are in operation at once. It is recommended to weld a second exhaust pipe immediately after the resonator and route it to the right side of the bumper. It is better to entrust welding work to professionals, since the quality of the exhaust will depend on the quality of welding.

You can use rubber bands to hook the new muffler - again, you will need to weld the hooks to the bottom in order to hook the mechanism onto them. Some car owners make special rubber blocks that include mufflers, avoiding the hassle of rubber bands. This is a more reliable way of wiring two “jammers”, although it requires large investments.

In this case, double nozzles are used for each muffler

Thus, every owner of a VAZ 2108–2109 will be able to easily identify malfunctions in the exhaust system and replace the muffler with a new one without contacting a service station. By the way, drivers of “eights” and “nines” are advised to prepare in advance for problems with mufflers, as they will fail quite often.

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Tuning the exhaust system of VAZ 2109 (099)

For the most part, tuning the exhaust system on cars of the VAZ 2109 model range involves installing a direct-flow system instead of the standard one. This is exactly what we will talk about. But, first, let’s briefly examine the theoretical side of the issue.

A few words about the theory of direct flow for the VAZ 2109

It is known that exhaust gas backpressure occurs behind the exhaust manifold. This pressure interferes with the increase in power of the power unit, and therefore it must be reduced as much as possible. In other words: if you reduce the level of back pressure, the efficiency of exhaust gas emission from the combustion chamber will significantly increase, which will accordingly allow a larger volume of fuel mixture to be pumped into it. In turn, the more fuel mixture enters the cylinder, the more power it can develop.

The main objective of a direct-flow system is to minimize output losses. Thus, due to the “forward flow”, the car reacts much faster when the gas pedal is applied and has greater torque.

Design features of a direct-flow muffler

Today, the market for tuned auto parts offers a fairly large assortment of various direct-flow mufflers for the VAZ 2109. Moreover, the design of most of them is the same.

The main element of such a muffler is a perforated pipe. Thanks to perforation, incoming exhaust gases expand quite effectively in the muffler housing (“barrel”). Due to this, their faster removal is achieved.

An interesting point: a really high-quality tuning muffler for the VAZ 21099 can be more than 80% of a straight pipe in total length. That is, if such a muffler was installed on your car, the resistance of the exhaust system would be only 10% greater than if you drove without a muffler at all.

Pipes for modified exhaust

Of course, one upgraded muffler is not enough to create an effective direct-flow system. In particular, in addition to the muffler, appropriate pipes must also be used. Such pipes must be of a sufficiently large diameter so that they can pass the maximum volume of gases with minimum resistance.

It should be noted that, as a rule, such pipes, in addition to a fairly significant diameter, have a special core inside. Thanks to this, even with any bends, the throughput of the pipeline remains practically unchanged.

It must be emphasized that not all pipes with a core are equally productive. An ideal exhaust system will only be achieved if only one pipe is installed after the exhaust manifold, and its beginning coincides with the outlet of the exhaust manifold. In practice, forward flow is created by welding short transition elements with already made bends. In this case, special attention is paid to the quality of welding work, because during the joining process, “growths” of molten metal can form inside the pipe. Such growths will impede the passage of gases, which is extremely undesirable.

Tips for choosing the right muffler for tuning

• The main attention should be paid to the weight of the muffler and the quality of the metal from which it is made. The greater the weight of the muffler, the better.
• Check the quality of the welds: they should be smooth and not very thin.

• You also need to look at the painted areas of the muffler. If you detect even the smallest area of ​​paint chipping, there is no need to take it: this is the first indicator that the muffler is already susceptible to corrosion processes and will not serve you for long. Most of the options on offer are now made from alloys or stainless steel.
• Pay attention to the length of the new muffler and its attachment points to the body.

For a VAZ car, you should choose a muffler that completely suits you in terms of design and level of noise absorption, because it is the one that can ensure comfortable movement in the car.

Damper installation

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

the damper is made by hand

A damper is also used to switch from a direct-flow to a return-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 move by the driver from the cab

You can drive a short distance with the throttle closed, but driving constantly is unacceptable for the engine.

the damper is installed in front of the muffler

Exhaust system repair

Muffler failure can occur from mechanical shock or exposure to harmful chemical elements and moisture. In this case, the device can be repaired at a car service center or with your own hands.

Repair of VAZ 2109 muffler with small cracks and burnouts

So:

• Initially, it is necessary to dismantle the muffler. The procedure itself is not too complicated; the time it takes to complete it will depend on the type of muffler mounting and the skills of the motorist. The main difficulty when unscrewing the device is to remove rust on the fasteners, which contributes to the parts sticking to each other.
• After removing the element, it is necessary to carry out a thorough diagnosis and determine the reason why the muffler malfunctioned. A thorough visual inspection of the external and internal surfaces will give an idea of ​​the nature of the problems that have arisen.
• If no visible defect is found on the outer surface, there are no burns or through holes from rust, then most likely the underlying cause of muffler failure will be a problem with the internal resonator. In this case, it is necessary to repair or replace the resonator. The old device is cut out using welding tools and the new one is welded. Welding and repair of the product is carried out in compliance with work rules in accordance with safety regulations.
• When small external burnouts are detected, special means are used to repair the muffler. Many auto stores offer various sealants for sealing cracks.
• Before applying the sealant, the edges of the crack are thoroughly cleaned of soot and rust is removed. This is done immediately before applying the sealant. A greater effect is achieved if the instructions for applying the material to the surface to be repaired are strictly followed. The basis of most sealants is silicone, which is sufficiently resistant to elevated temperatures. The operating range of high-quality material can reach a thousand degrees.
• If burnouts are found on the outer surface that are difficult to seal with sealant, fiberglass is used. In this case, it is fixed to the damaged areas of the muffler using epoxy resin containing some additives.
• After fixing all the errors, the muffler is installed in place and the car is warmed up at idle speed for an hour, for better hardening of the epoxy resin.

At the same time, you can clearly see how the plugs on the VAZ 2109 engine were replaced. If there is no leakage of coolant, then the replacement of the VAZ 2109 cylinder block plug was done efficiently and in the near future no replacement of the VAZ 2109 block plug will be needed.

Repair of a burnt-out muffler VAZ 2109

Most often, the muffler burns out on the front wall, where the “gander” enters the can; the “gander” can burn out or at the junction of the muffler with the resonator. In the last two cases, repairs are carried out quickly: it is enough to weld a repair insert or a piece of pipe.

Tip: Very often it is not practical to repair the muffler. Its walls are very thin, and if it practically burns out when welding one hole, another appears nearby. Moreover, such repairs, despite the fact that the price for them is small, are only a temporary measure and it is better to replace the muffler as soon as possible.

Carrying out welding work:

• Welding is carried out semi-automatically. To apply the overlays, metal one or two millimeters thick is taken.
• The welding area is cleaned down to the thick metal that has not yet burned.
• To perform a high-quality restoration of the muffler, it is necessary to remove the mounting strip from it.
• The can and the gander are connected. It is very important to correctly align the parts relative to each other. First, you need to weld the parts, try them on the car, and only then thoroughly weld them, as shown in the photo.

• For a more reliable connection, two pads are welded to the front wall and the gander.
• To reduce rattling and breaking off of the “gander”, a small brace is installed.

Replacing the fuel filter of a VAZ 2109 car

When replacing or repairing a muffler, it is best to replace the fuel filter, which is recommended to be changed after twenty thousand kilometers traveled by the car. Filters require more frequent replacement if the car is fueled with bad gasoline. Replacement is carried out in the following sequence:

• The fuel filter is located in front of the exhaust pipe behind the fuel tank. The bolts tightening the bracket holding the filter are loosened.
• The fittings of the pipelines - outlet and inlet - are unscrewed. For this, two “19” keys are used. One is installed on the nut located on the filter housing, and the second unscrews the nut of the pipeline fitting.

It is necessary to remember the location of the fuel direction indicator before removing the filter. The filter is removed from the bracket.

When installing a new part, you need to focus on the indicators that are printed on the surface of the filter. If the installation is performed incorrectly, fuel will not flow into the pipeline. It is imperative to install the O-rings, otherwise there will be a fuel leak. The filter is installed in the reverse order. Then start the engine, inspect the joints for the presence of fuel drops. When they appear, the seals of the fittings and the tightening of the nuts are checked.

How to determine whether a muffler is faulty

You can identify problems with the muffler yourself, without having any special knowledge of the automotive industry. First of all, while driving, occasionally monitor the composition of the exhaust gases. If black smoke comes out of the pipe when you press the gas pedal, then the mechanism is probably burnt and has holes.

Experienced car enthusiasts know that it is better not to bring the condition of their “glushak” to a critical level, but to identify the smallest faults in advance:

• Check if there are knocking or gurgling noises in the exhaust pipe while driving.
• Raise the car on a jack and inspect the exhaust pipe. All parts must be free of rust, burns or holes.
• Observe whether moisture drips from the muffler pipe connections. The accumulation of condensate will quickly lead to the formation of rust and corrosion of the metal.
• Assess how hot the engine gets after short trips. If the engine seriously overheats, this may be the first signal that the exhaust system is not working correctly.

If the muffler knocks

Most often, car enthusiasts complain that the device begins to knock loudly while driving. In this case, the pipe can be struck either against the body of the gas tank or against the body of the car.

The knocks can be very loud, which leads not only to a decrease in ride comfort, but also to rapid deformation of the muffler itself. In these cases, it is necessary to immediately take measures to isolate the pipe from the tank or body:

• change the hanging rubber bands (it is quite possible that during operation they have become very stretched and can no longer hold the pipe in one place);
• if the knocking starts after replacing the device, then you need to turn the mounting flange and make sure that all the gaskets are in place exactly;
• if the muffler was replaced with a “cooperative” one, homemade or from another car model, then you need to try to ensure that all fastening connections and joints exactly match the original.

If the pipe swings strongly, it is necessary to replace the rubber bands with new ones.

If none of these measures gives results, you will have to cover the impact area of ​​the muffler with a thick piece of rubber. Rubber will eliminate the sound of impacts and protect the surface of the pipe from deformation.

What to do if the muffler is broken

You can break through the device very simply - just drive at high speed on an uneven road. Even the thickened walls of the pipe cannot prevent the metal from being severely deformed, and holes may even form.

The legislation of the Russian Federation clearly indicates that operating a vehicle with a broken muffler is prohibited.

If the driver discovers that the mechanism is broken, he has only two options:

• Replace with a new one. This is the easiest way, besides, you can buy a home-made “glushak” and install it on the car yourself.
• Using a welding machine, weld a hole in the housing. This option is more expensive, since it is necessary to apply welds very carefully so as not to burn through the muffler. In addition, the driver does not always have the skills to operate the device and has to turn to specialists.

Operation of a muffler with a hole is prohibited

Muffler device (diagram)

The design of the muffler has already been partially discussed, now let’s delve deeper into the topic.

You probably already realized that mufflers have many distinctive features; no devices have the same design; each manufacturer introduces its own innovations to improve the design of its brainchild.

The main goal is to reduce the sound as much as possible without losing engine power.

In a typical production car, the muffler takes from 5 to 7% of the power. To achieve absolute silence, you need to either increase or install an additional device with a resonator, and this will take another 5 to 7% of the power. The total is 10–15%, which no one wants to lose.

Those. It turns out that it is not so easy to make an ideal muffler so that there is little noise and no loss of power.

The design of the product is largely influenced by:

1. Engine capacity;
2. Tuning or regular engine installed;
3. Make of the car and its purpose (sports or regular);
4. Who is the manufacturer.

The classic muffler for most cars consists of:

1. Inlet and outlet pipes;
2. Internal pipes;
3. From two or more expansion chambers;
4. Internal partitions;
5. Helmholtz resonator.

The sound entering the device through the inlet pipe is reflected from the walls and travels a distance of more than 1 km, constantly weakening.

The resonator serves to weaken the most powerful component of the sound wave, which a conventional labyrinth cannot cope with.

The chambers in the muffler are of different sizes because the length of the sound waves is also different.

The inlet pipe, as a rule, has holes and is considered dissipative, since sound entering it is partially dissipated in the first chamber.

The waves move chaotically in space, reflecting from the walls and constantly losing energy. This occurs due to the force of friction against air molecules.

The more of the wave remains in the first chamber, the more the wave attenuates.

The remaining waves pass into the second scattering chamber; however, it is not easy for them to pass from a narrow pipe into open space since, according to the law of acoustics, a sound wave seems to collide with a wall of air.

Part of the wave is not able to enter the second chamber and is reflected back from the interface and partially absorbs the oncoming flow.

The same waves that were able to get into the second chamber are randomly reflected from the walls, absorbing each other and losing energy during friction with the air.

But the main component of the sound wave passes further and enters the Helmholtz resonator.

The sound wave again has to leave the narrow space into the free chamber, and it seems to press on the air in the resonator, creating air vibrations.

This creates a reverse sound wave that has the same frequency as the original one. They collide and destroy each other.

Some of the waves remaining in the second chamber enter another pipe and are transported to the third chamber.

There again, sound loss occurs due to friction with the air, and only after this the weakened wave enters the output pipe, and from there out.

What materials are they made from?

Silencers of all types can be made from:

• Of stainless steel;
• Aluminized (alloy of aluminum and steel);
• Regular black steel.

A stainless steel product can last, during active vehicle use, from 6 to 10 years, as it is least susceptible to corrosion.

They are sold on the market in a high price range, their big advantage is that despite the high price, they are mass produced and can be matched to most car brands.

Products made from aluminized steel are sold in the middle price range, they are also quite durable, but they are difficult to match to a specific car brand, since the choice on the market is not large (only a few companies produce them).

It is problematic to make such a muffler in a garage. The main advantage is a long service life of up to 6 years, and are less susceptible to corrosion.

Products made of black steel are mass produced because they are the cheapest. They can be made in a garage for any brand of car, but they will serve for 3, maximum 5 years, then the aggressive environment and rust will do their dirty work.

Sound absorption technologies

The exhaust system, and in particular the muffler, can use one or several sound absorption technologies:

• change in gas flow cross section;
• changing the direction of gas movement;
• surface absorption of sound waves.

Depending on which frequencies predominate in the engine exhaust sound spectrum, this sound reduction method is used. For example, to suppress low frequencies, it is effective to use several resonator chambers with different volumes. The use of different sections of input and output pipes combats high frequencies well. But in principle, a muffler, like a good musical instrument, is customized exclusively for a specific brand of engine. Then the noise reduction efficiency is much higher and there is less power loss.

Where is it located and how does it work?

The muffler is installed on the underbody of the vehicle at the end of the exhaust system.

As a rule, a resonator is installed in front of it, closer to the engine, which reduces low-frequency vibrations and plays the role of an additional component in the exhaust system.

Despite the seemingly small size of the device, the sound wave travels through it for several kilometers. This is achieved by the presence of labyrinths inside the muffler, which attenuate sound waves.

The further a wave travels, the more energy it loses and the smaller the sound becomes.

To understand what a muffler consists of, you need to understand what types of devices there are and how they differ from each other.

Repair methods

Often traveling along our “magnificent” roads, you now and then run over all kinds of bumps, potholes, and holes. If, after passing another similar obstacle, the car begins to make noticeable noise, which was not the case before, then the most likely outcome is a hole in the main muffler. The presence of a hole does not allow you to work calmly, quietly and efficiently as before.

The law of the Russian Federation states that it is prohibited to operate a car with a broken muffler. Therefore, the only correct solution would be to repair the unit.

There are two ways to repair the main muffler:

• Replace with a new one. Practical, easy and fast. You can do this kind of work with your own hands without any problems.
• Fill the hole. This option is suitable only if the hole can be welded given its size, and you also have experience in welding. It is better to entrust welding to professionals.

Replacing the main muffler

To remove the muffler, follow fairly simple step-by-step instructions.

• Arm yourself with a 13mm deep socket socket, a 13mm spanner and a ratchet.
• Drive the car into the inspection hole, or lift it using a lift. Although you are unlikely to have a lift in your garage. But almost all garages in auto cooperatives are equipped with pits.
• Wait until the entire exhaust system has cooled completely, otherwise burns will occur.
• Disconnect the main muffler from the resonator, that is, the additional muffler. To do this, find a tie rod. The fastening nut is grabbed with a spanner to avoid turning. At the same time, the bolt is unscrewed using a ratchet.
• After unscrewing the bolt, remove the fasteners, disconnect the exhaust system elements, remove the clamp and free the main muffler from the resonator.
• Carefully remove the front part of the silencer from the rubberized suspension.
• Remove it from the rear suspensions and pull the damaged element out.
• Then act according to the circumstances. As we noted, a broken muffler can be welded, or a new one can be installed in its place.
• Reassembly is carried out according to the instructions provided, only in the opposite sequence.

When choosing a new main muffler, focus on the characteristics of the factory product. If you want to modify the rear of the car, simply install a decorative nozzle on a regular pipe. You should invent something with the modernization of the aircraft only if work is being carried out on the technical modification of the car - tuning.

Replacing the resonator

To change the additional muffler, follow the instructions provided:

• By analogy with the previous stage, disconnect the main and additional mufflers;
• Disconnect the element from the catalyst. Here you have to use a spanner wrench to unscrew a pair of mounting bolts;
• Lift the unit a little and disconnect it from the rubber hangers;
• In some cases, this cannot be done manually. In such a situation, use a flathead screwdriver to pry out the hangers;
• The dismantling process is even easier than in the case of the main muffler;
• Installing a new element is performed in the reverse order.

Changing the resonator

To do this, we need a basic set of tools (open-end wrenches and heads), as well as an inspection hole. You can start repairing the VAZ-2109 exhaust system only after making sure that it has cooled down. So, we need to disconnect the resonator from the muffler on one side and the catalyst on the other. You need a socket wrench to unscrew a couple of bolts. Then we lift the resonator and disconnect it from the rubber pads. If the resonator does not budge, you need to use a flat-head screwdriver. With this we can carefully pry off the rubber suspension element. Then everything is simple - we take the part out and put a new one in its place. Assembly is carried out in reverse order.

Tuning

Those who want to change the exhaust sound to a sportier one can install a straight-through Stinger muffler. The exhaust system of the VAZ-2109 is also modified by installing a “Stinger” brand spider.

As a result, gases will freely leave the combustion chamber. But you need to understand that the exhaust sound will increase several times. Since there are no such labyrinths in a direct-flow muffler, all gases go directly into the atmosphere.

The car will sound sporty, but there is no need to talk about a significant increase in power. A more correct solution is to install such a muffler after upgrading the engine. You can start by installing a 16-valve head, then change the intake system, mount a turbine, and so on. There is no point in installing direct flow on a simple VAZ engine. The standard exhaust system already copes with the exhaust from a simple atmospheric engine. In the case of installing a turbine on a “nine”, such modification is simply necessary.

The main reasons for loss of performance

Despite many nuances, the structure of the exhaust system of the car in question is of a high level of quality. Since the design is quite simple, there is practically nothing to break there, except perhaps a violation of the structure of the muffler. Most often, a decrease in the performance of the muffler occurs as a result of the appearance of holes. A broken muffler is common on roads with poor quality surfaces.