Exhaust system of VAZ 2108, 2109, 21099 cars with carburetor engine

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The exhaust system does not have a complex design or device at all. Its main task is to release exhaust gases. But it's not that simple. If you released exhaust gases into the atmosphere, the damage to nature would be enormous. Therefore, modern developments have been applied that allow gas to be purified before exiting, making them safer for the environment.

Bottom view

Let's study the exhaust system using the example of the VAZ 2109 model.

Muffler device for VAZ 2108 and 2109

It should be noted right away that the mufflers of the VAZ 2108 and VAZ 2109 cars are practically no different from each other in design. The only difference is the dimensions: the exhaust pipe on the “nine” is 8 cm longer.

The muffler on VAZ 2109 and 2109 cars consists of two parts:

• main muffler;
• additional muffler (aka resonator).

The main muffler body has the shape of an oval pipe and is made of alloy steel. The housing has a number of partitions that form resonator compartments. There are also two exhaust pipes (exhaust and inlet) and the main exhaust pipe. All these elements are connected using rolling. Spot welding is practically not used in such devices, so as not to reduce their corrosion resistance.

The resonator body is a round tube with an aluminum coating. Inside there is another pipe with holes, at the ends of which there are mounting flanges. With their help, the resonator is connected to the gas receiver of the car.

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.

How to determine whether a muffler is faulty

It is not difficult to understand that the muffler of a VAZ 2109 car is faulty:

• the volume of the engine increases sharply, the engine begins to growl;
• In this case, the engine power is reduced by two or even three times;
• the cabin smells of exhaust fumes;
• if the driver does nothing, the growl of the engine is replaced by a deafening roar, which can sometimes be accompanied by pops similar to pistol shots.

All this suggests that a hole has formed in the muffler housing. If you don't do anything about it, then problems are inevitable:

• If the muffler is faulty, carbon dioxide contained in the exhaust gases may end up in the vehicle interior. This gas is colorless and odorless, but causes severe headaches and dizziness. And if exposure to dioxide lasts for a long time, it can lead to the death of the driver;
• Driving with a faulty muffler cannot be called comfortable;
• Driving with a faulty muffler is expensive: there are rules to limit noisy driving. Violation of these rules may result in fines.

Main malfunctions of VAZ 2109 and 2108 mufflers

There are several typical muffler breakdowns that owners of VAZ 2109 and VAZ 2108 cars encounter:

• Holes appear in the main muffler housing. Due to high temperatures accompanied by strong vibration, the case simply burns out. The cause can be either thermal or chemical corrosion. The problem is solved by applying a patch and subsequent welding of the damaged body;
• The muffler constantly overheats. As a rule, this occurs due to coking of the holes in the resonator partitions. In this case, hot exhaust gases accumulate in the silencer, and engine power rapidly decreases. To eliminate the problem, the muffler body is opened, damaged resonator partitions are replaced with new ones;
• The muffler is ringing. Ringing in a muffler occurs when the resonator partition in its body is completely or partially torn off. The problem is eliminated in the service using spot welding;
• The muffler is knocking. This is observed when one or more mounting hangers are broken. After this, the muffler body begins to dangle under the bottom of the car, periodically hitting it. It is not possible to fix such a breakdown on the road. The only way out is to slow down to a minimum and drive to a car service center with an inspection pit, where mechanics can replace the broken fasteners.

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

Replacing the muffler on VAZ 2109 and 2108

Replacing a muffler on VAZ 2109 and VAZ 2108 cars always begins with the selection of the necessary tools and materials. Here's what we need to get started:

• new muffler;
• set of open-end wrenches;
• set of socket heads with ratchet;
• pliers;
• flashlight.

Sequencing

In order for the result of the work to please the car owner, it is advisable to act according to the following algorithm:

1. The car is installed on the inspection hole. The engine is turned off and wheel chocks are placed under the wheels.
2. The muffler pipe is disconnected from the resonator pipe. To do this, the nut on the clamp is held with a 13-mm open-end wrench, and the bolt from below is unscrewed using a socket head with a ratchet.
3. The clamp, freed from the bolt, is slightly bent with pliers and removed.
4. The muffler is held under the bottom by a system of rubberized suspensions. There are three hanging hooks on the muffler body. To remove the muffler, you need to lift it slightly so that all the hooks are disengaged (usually at this moment a characteristic click is heard).
5. The muffler removed from the hangers is removed from under the car.
6. A new muffler is installed in place of the old muffler. All installation operations are carried out in reverse order.

When installing the silencer, you should pay attention to the reliability of the connections and make sure that it is correctly secured under the bottom of the car.

Video: removing the muffler on a VAZ 2109

Engine support cushions

If, while driving, knocking noises are heard in the engine area, regardless of whether the car is driving on a flat road or on bumps, and at the same time the car begins to vibrate, shake, or the steering wheel hits, then you should pay attention to the engine mounts, especially often on VAZ 2110/2115 and others, the lower support of the internal combustion engine (on the gearbox) fails

You also need to check the condition of the left and right airbags. To do this, just grab the engine and shake it. If the unit wobbles freely, there is something wrong with its supports. Strong vibration of the internal combustion engine may also be observed during its operation.

There is only one way out - replacing the failed support cushions.

Wheel rim bolt pattern for VAZ, Ford, Opel, Nissan, bolt pattern table

Assembly of a double muffler for a VAZ 2109

Before describing the process of assembling a double muffler, I would like to note that in order to successfully carry out such an assembly, the driver must be able to work with a welding machine. If you don’t have such skills, it will be much easier to buy a ready-made double muffler for the VAZ 2109 in a specialized store.

Double muffler assembly sequence

To install the muffler, follow the sequence of operations:

1. The muffler is removed from the car in accordance with the instructions presented above.
2. A hole for a pipe with a diameter of 5 cm is carefully cut out on the side of the muffler body. Then the upper part of the muffler body is carefully cut off, and all resonator partitions are removed. In their place is installed a perforated metal mesh, twisted into a tube.
3. The pipe is inserted into the body and welded to it. Its end is inserted into a twisted perforated mesh, in which a hole is previously cut. This end is welded to the mesh.
4. A pair of L-shaped pipes are welded to the standard muffler pipes.
5. For heat and sound insulation, the entire structure is filled with glass wool.
6. The previously cut off upper part of the muffler housing is put in place and welded. The resulting design is shown in the photo below.
7. Now the double muffler is installed on the car.

Replacing a muffler is not a particular problem even for a novice driver. All you need is a viewing hole, a couple of keys and a little patience. But the repair of this device almost always involves welding work. And if the car owner does not have such a skill, then it will not be possible to do without the help of qualified auto mechanics.

The most common problem with the VAZ 2109-2108 exhaust system is muffler burnout, and this often happens even after 50,000 km. Here, first of all, everything depends on the quality of the steel from which it is made. The factory one, as a rule, lasts much longer than the ones installed afterward, since the quality of the original parts is somewhat higher. If your car's muffler is burnt out, it needs to be replaced.

Of course, there are some owners who try to repair the burnt areas, but such “patches” obviously won’t last long, and sooner or later you will still have to replace the part with a new one. For this job you will need the following tool:

• head deep 13
• ratchet handle
• open-end or socket wrench 12 or 13 (depending on the installed mounting bolt)

So, the first step is to disconnect the muffler from the resonator, for which you need to unscrew the clamp. Use one key to hold the bolt from turning, and use the second to unscrew the nut:

About repairs

Some owners resort to muffler repair. But it must be said that such measures, if not useless, are at least temporary. The fact is that gases can break through not only outside the muffler, but also inside. That is, after installing the patch, the exhaust sound will not change. The cost of a new muffler for a “nine” is now about a thousand rubles. And it will last much longer than the old repaired one.

Features of the system design

The structure of the exhaust gas removal system has a similar structure on all domestically produced cars. One such example is the VAZ 2109.

The exhaust system of the car in question has the following structure:

• Receiving type pipe. A special-purpose probe is mounted in the pipe cavity. The capabilities of the device include processing the composition of emitted gases, which makes it possible to analyze the mixture used as a flammable liquid and, according to incoming data, make the necessary changes, which implies monitoring the quality of the liquid;
• A catalytic converter is installed after the exhaust pipe. The functions of this element include cleaning the gas mixture from harmful elements, which is the main task of the excretion system;
• Additional muffler. This element is fixed using a clamp. Its mounting location is located on the catalytic converter. An additional muffler is installed to reduce the sound waves generated;
• Main muffler. This element is secured to the additional muffler using an identical clamp. Its function is comparable to that of an additional muffler.

Paying attention to the exhaust system of the new VAZ 2109 car, you will notice that it is installed on rubber mounting hangers screwed into the bottom.

Main elements of the exhaust system

The muffler resonator is installed immediately after the exhaust pipe and the catalyst, and its task is to level out pulsations of the gas flow. In cross-section, it looks like a perforated pipe placed inside a metal chamber of a larger diameter. The pipe can change its cross-section on the way from the inlet to the outlet of gases.

The main muffler may have a more complex design and has the main function of noise reduction. Modern systems can have almost all noise reduction schemes in the rear muffler can. The chamber through which the main pipe passes can have several sections, each of which has noise reduction at its own level. Typically, these chambers are filled with heat-resistant fiber material, which further dampens vibrations and absorbs sound vibrations.

The design of a car muffler is constantly evolving, and we try to follow the news from the design bureaus of the most progressive automakers and tuning studios. Stay with us, and let your mufflers only please the ears of avid motorists. Happy travels to everyone!

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.

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.

Removal and restoration of the main muffler

Quite often, when using a VAZ 2109 car, problems arise with the performance of the muffler. This often happens as a result of careless driving when the car hits a bump or hole. A hole appears, which disrupts the work. The operation of a vehicle with a damaged exhaust gas exhaust system is limited by special technical regulations. One way or another, to restore functionality, it is necessary to repair the element responsible for neutralizing sound vibrations.

Direct flow - how to make it yourself.

The muffler is an element of the engine exhaust system. Its presence does not depend on the type of fuel the engine runs on - gasoline, diesel fuel or methane. The muffler dampens sound vibrations, helps attenuate, subside and resonantly reduce sound waves from engine exhaust. Interlocutors will not be able to communicate around a running engine without a muffler. The noise of the engine will drown out their speech. Nevertheless, many car owners dream of remaking the exhaust system and making it forward-flowing. Some people can create it with their own hands.

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.

After this, the element rises a little and is freed from the rubberized parts of the suspension. If difficulties arise, use a hard metal object, such as a screwdriver. Removing the additional muffler is easier. Installation of a new part or a restored one is carried out in order, only in reverse order.

Measures to replace the catalytic converter

The performance of this element is quite high. Violation of its functioning is a fairly rare case, however, understanding and knowledge of the basics of its dismantling and repair, in the future, can make life much easier. Before starting repairs, you should familiarize yourself with the safety rules. All elements, one way or another involved in the process of removing exhaust gases, heat up to high temperatures during operation. The catalyst is no exception; its temperature can exceed 600? C. It will take longer to cool down than cooling the mufflers.

Removing the catalyst is possible according to the following scheme:

• To begin with, the catalytic converter is freed from an additional type of muffler. When unscrewing the bolts, a spanner is used to fix the nuts;
• After this, in an identical way, the catalyst is freed from the receiving tube, on which it is held with bolts;
• After removing all possible fasteners, the catalytic converter can be removed from the rubberized suspension part of the car.

After reviewing the information, you can draw certain conclusions about the complexity of the repair. All work, in fact, is quite feasible without outside help, the main condition is the availability of tools. The greatest attention is paid to safety, since the problem of the car’s performance can be solved without problems, which cannot be said about the health of the body.