Repair and replacement of the resonator on a VAZ 2107: do it yourself

Published: 10/30/2020

• Main elements of the exhaust system
• Choosing a resonator for VAZ 2107
• Resonator
• Location of the VAZ 2107 resonator
• Muffler VAZ 2106
• Lada 2107, 241 thousand without capital › Logbook › Replacing the VAZ-2107i injector resonator
• Basic moments
• How are knocking and muffler position related?
• Exhaust system design of VAZ 2107
• What is a muffler for?
• Differences between the exhaust systems of carburetor and injection VAZ models
• Volkswagen Jetta Chocolate shark › Logbook › Self-oil change in DSG-7 1.4 (122). Report.
• Roger Shah meets Aly & Fila and Susana – Unbreakable
• How often does a muffler need to be repaired?
• Car engine noise - elimination principle
• Symptoms of a clogged muffler

Main elements of the exhaust system

The design of the exhaust system becomes more complex, but with each new car model it includes all the same elements.

Collector

The exhaust pipe is an intermediate link between the car engine and the converter (catalyst). The collector is responsible for the removal of gases. Since in this case there is a very strong mechanical and temperature load, which can reach up to 1000 degrees, quite strict requirements are imposed on this part of the muffler. Therefore, in the manufacture of the intake pipe, only the best alloys of cast iron and steel are used.

Also, a vibration compensator (corrugation) is sometimes installed on this part, thanks to which engine vibration is damped and does not pass further through the exhaust system.

Neutralizer

The catalytic converter (or catalyst) “afterburns” unburned fuel residues and processes carbon monoxide. This element of the exhaust system is a special chamber or tank in which a ceramic or metal element in the form of a honeycomb is located. Thanks to these honeycombs, gas mixtures are purified through chemical reactions.

Now manufacturers have begun to produce multi-section neutralizers that meet all international standards, which process a wider range of harmful substances.

Front muffler (resonator)

The resonator is, in fact, one of those parts that are commonly called mufflers. This element performs the function of reducing noise, but not cleaning exhaust gases. When gases pass through the resonator, a lot of noise is created. Therefore, the internal “filling” of the front muffler consists of numerous grilles and holes that reduce the speed of escaping gases, as well as vibration. By and large, a resonator is a tank with a perforated pipe.

Front mufflers are:

• Active. Such mufflers are made of special sound-absorbing materials, and their design is simple.
• Reactive. Silencers of this type use combinations of expansion and resonator chambers.

Do not confuse the resonator with the rear muffler, as their design is very different.

Rear muffler

When we say “muffler,” we most often mean the rear part of the exhaust system. This element provides the final absorption of noise and also carries out the final removal of gases.

Unlike the resonator, the internal “filling” of the rear muffler is heterogeneous. Several chambers with special fillers are installed inside it. Thanks to the porous structure, the system of partitions and air ducts, it is possible not only to get rid of strong noise, but to reduce the temperature in the system.

Speaking of noise reduction, we cannot ignore another type of system that reduces excessive noise in the exhaust pipe.

A cross-section of a car muffler operating on the principle of noise absorption is shown in the diagram.

As in the resonator, partitions and jumpers in the form of tubes are installed here. Only in the latter are many holes of different diameters (perforation) made, and non-flammable absorbing material is laid on the sides. As a rule, basalt or kaolin wool is used for these purposes, which can easily withstand gas temperatures of 600–700 °C.

Sound waves, passing through adjacent pipes with holes, are partially scattered and damped by overlapping each other. The second part of the vibrations is absorbed by the filler, and the third is smoothed out due to partitions and a change in the direction of flow.

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.

Choosing a resonator for VAZ 2107

Four types of resonators are installed on the VAZ 2107:

1. Long section with one tank. Installed on all classic carburetor VAZ 2101-2107 with an engine capacity of no more than 1.3 liters. Catalog number - 2101–1202005.

The last two types of resonators are shortened due to the addition of an additional element - a catalytic converter. Parts for Euro 2 and 3 differ in length (spare parts for Euro 3 are shorter) and the number of mounting bolts on the flange. The second tank is missing - its functions are performed by the catalyst.

The choice of resonator depends on the specific modification of the VAZ 2107. When purchasing, you need to keep in mind the following recommendations:

1. On the carburetor version with a 1.3 liter engine, you can easily install a long section with one (VAZ 2101-07) or two (VAZ 2106-07) tanks. In the second case, the sound of the running engine will become quieter, but the power will drop by about 3-5 hp. With. Shortened resonators will not work.
2. Both long resonators are suitable for carburetor and injection VAZ 2107, corresponding to Euro 0. When installing a part with one tank, the exhaust noise will increase and the engine power will increase slightly. Short pipes cannot be installed.
3. The exhaust system for Euro 2 is equipped not only with a catalyst, but also with an oxygen sensor (lambda probe) mounted in the exhaust pipe. For such cars, the original shortened resonator with a two-bolt flange or any long section is suitable. However, such a resonator is not suitable for the VAZ 2107 Euro - it is connected to another catalyst and differs in length.
4. The exhaust system of the VAZ 2107, manufactured in accordance with Euro 3 standards, has two oxygen sensors. On the VAZ 21074 you can install the original short resonator or a long one, but with some modifications.

Once it was possible to modernize a 1.3 liter engine by increasing the displacement to 1.7 liters by replacing the crankshaft and boring the cylinders to size 82 mm. After which it was necessary to replace the “native” resonator with one barrel, because with an increase in engine power, the exhaust pipe began to roar more strongly, especially at speeds above 2500 rpm.

It makes no sense to install a resonator from other brands of cars and front-wheel drive VAZ models on the “seven”. You will have to strongly heat and bend a pipe made of refractory steel. An alternative option is to weld the resonator tank with your own hands based on the burnt-out element.

Installing long sections on the VAZ 2101-07 that comply with Euro 2 and 3 standards is advisable in cases where it is necessary to discard a failed catalyst. The latter is quite expensive, and not every car owner is ready to make a full replacement. In this case, after installing a long resonator pipe, you will have to install a snag instead of the second lambda probe or reprogram (reflash) the engine control controller.

Threaded connection

The old spare part is still cut off with a grinder. In order to install a new part, you must do the following:

• On the rings and exhaust pipe, drill eight holes with a diameter of 4-6 mm around the circumference at the points of contact;
• Using an M5 tap, cut threads in the drilled holes;
• Treat all structural parts with sealant;
• Screw the bolts into the holes;
• Install corrugation.

The use of high-temperature sealant will ensure the reliability of the connection. After completing these steps, you will receive a fairly high-quality and sealed car exhaust system assembly.

Resonator

Resonator - a part of the exhaust system that dampens sound vibrations after gases exit the combustion chamber

The main task of the resonator is to dampen the sound vibrations of roaring exhaust gases escaping from the combustion chamber. The size, shape and design of the resonator directly affect how loud the engine will be. If this part breaks, the operation of the entire exhaust system is disrupted. The car becomes noisy and the smell of exhaust enters the cabin.

The history of the appearance of the resonator in the exhaust system

The first resonator appeared on a car at the beginning of the 20th century. Reducing the noise level was the first task that the developers had to solve, since soon after the appearance of production cars, pedestrians became dissatisfied with their excessively noisy work. This part began the creation of a complete exhaust system, which can be seen in modern cars.

Operating principle of the resonator

Exhaust gases are generated in the combustion chamber and are discharged from the cylinder through the exhaust valve. After this, they move at high speed along the exhaust manifold and exhaust pipe. In this case, the temperature of the gas mixture is about 650 degrees Celsius, so the parts of the exhaust system are subject to serious thermal stress.

The most difficult thing to create is a resonator design for a sports car. On the one hand, it must allow a flow of gases to pass through it without creating obstacles. On the other hand, reduce the noise level

Next, the gas flow enters the catalyst, and then into the resonator, which is a cavity with one or more chambers. A pipe with small holes passes through the chambers, through which a divided flow of gases passes. Passage through the pipe promotes mutual absorption of sound waves.

Types of resonators

More complex modern resonators may have a shell with thermal insulating material between the layers. Such parts not only absorb noise, but also protect the body from heating.

Increasingly, in the automotive industry there are combined resonators that consist of two parts. The first part of the part is based on the classic design with a pipe and internal bulkheads, and the second is filled with noise-absorbing material (usually basalt fiber). Such combined resonators work more efficiently than conventional ones.

Resonator operation and problems

The resonator with a double casing lasts the longest. The material must be resistant to corrosion. Typically, inexpensive mufflers for consumer vehicles are made from aluminized steel, which is regular steel coated with a thin layer of aluminum to protect the surface from corrosion. The volume of the resonator also plays an important role. The effectiveness of its work depends on this indicator. If the volume is not enough, then when you press the gas pedal sharply, the noise will increase significantly, and the part itself may begin to vibrate.

When buying a resonator made of aluminized steel, you should remember that the low price of the product is obtained by reducing durability. The best resonators are made from stainless steel

Like any part of the exhaust system, the resonator is exposed to the harmful effects of aggressive factors: operation in a gas environment, high temperatures. Because of this, the service life of exhaust system parts is very short. Signs of a breakdown may include increased noise, the smell of exhaust gases in the car, or the presence of wisps of smoke under the bottom. In this case, it should be changed.

Resonator in motorsport

Due to its simplicity and low weight, the resonator is used in motor sports, but for these purposes the part often undergoes significant changes. As a rule, sports cars are equipped with resonators that have a more complex type of chamber that provides sound absorption and has minimal resistance, that is, it does not increase back pressure in the exhaust system. Sports mufflers are usually made from stainless steel, since it has a smoother surface (creating a minimum of turbulence in the system), and parts made from it work better in extreme temperature conditions.

Some breakdowns

The exhaust system of the VAZ 2107, the price of which can be impressive, does not always provide for the need to contact a car service if a breakdown occurs with it. There are malfunctions of the muffler itself, the exhaust manifold, corrugations, and neutralizer. The muffler most often fails due to low-quality gasoline and mechanical failures. On average, this unit lasts about three years.

Here we can advise you to refuel only at proven gas stations, and be careful when driving over obstacles in nature. When replacing, buy a quality product

A VAZ 2107 exhaust system diagram may be needed if you intend to make repairs. Many questions arise when the neutralizer fails. The replacement just costs a pretty penny. Many car owners simply throw it away. Even then, some work needs to be done. There is a way out of this situation. In place of the standard neutralizer, you can install parts from another manufacturer. They are much cheaper and have good quality. The main thing is to first find out what reviews there are about this part. This is not a problem when purchasing. Both the seller and other buyers will advise.

The exhaust system of the VAZ 2114, the price of which is 500 rubles, may require the installation of a flame arrester. One feature must be taken into account here. Not every flash arrester will fit your vehicle. You will have to look for one that is suitable for your brand. The metal catalyst is mostly praised. According to reviews, such failures are much less common.

Location of the VAZ 2107 resonator

The exhaust system of carburetor VAZ 2107 consists of three sections:

• double exhaust pipe connected to the exhaust manifold flange;
• resonator;
• main muffler.

A similar system was installed on the first seven with an injector that complied with Euro 0 standards. Later, injection modifications of the VAZ 2107 appeared, produced in accordance with the requirements of Euro 2 and Euro 3, in which the exhaust tract was supplemented with a fourth section - a catalytic converter located between the exhaust and resonator pipes .

The resonator, connected at the front to the exhaust pipe or catalyst, starts under the gearbox and ends in front of the rear axle beam. The resonator tank is located to the right (in the direction of travel) of the propeller shaft. The connecting pipe coming out of the body is bent upward and docked with the main muffler pipe that goes around the rear axle. The entire structure is supported by the engine exhaust manifold flange, a metal bracket and rubber hangers attached to the bottom of the car.

Alternative options for modifying the unit

Methods for cleaning a car exhaust system

If there are no problems with the exhaust system, then tuning can be done. The second tuning option, on the contrary, brings considerable benefits to the exhaust system. All parts from the exhaust manifold to the muffler are rigidly connected. When moving, vibration occurs, and therefore cracks and breaks occur. What can be done in this case? There is only one way out - installing corrugations. Then the entire structure is divided into two independent parts. Vibration will no longer have an effect. Frequent visits to a car service are eliminated.

To install the corrugation, you will have to contact the craftsmen. This work requires tools that the average car owner will not have in his garage. The VAZ exhaust system, the price of which should interest you before purchasing, can not only be repaired by the car enthusiast himself, but also tuned.

Muffler VAZ 2106

Today, mufflers for the “six” can be purchased in two versions: stamped and welded.

The stamp-welded muffler can be considered a classic option, since these are the models that were installed on all old cars. The essence of such a muffler is in its production: the two halves of the body are welded together, then a pipe is welded to the body. The technology is very simple, so the device is inexpensive. However, it is precisely because of the presence of welded seams that the stamped-welded “glushak” will last at most 5–6 years, since the seams will quickly corrode corrosion.

Products made using traditional technology are affordable

A sunset muffler is more durable and can last up to 8–10 years. Its production technology is more complex: a sheet of metal is wrapped around the inside of the muffler. Technology makes production more expensive.

Modern rolling technology allows us to produce high-quality and durable mufflers

Which muffler to put on the “six”

Choosing a muffler is not an easy matter. In auto stores and on the automobile market, sellers will offer a variety of models of mufflers, and at quite attractive prices:

• muffler IZH from 765 RUR;
• muffler NEX from 660 RUR;
• AvtoVAZ muffler (original) from 1700 RUR;
• muffler Elite with nozzles (chrome) from 1300 rubles;
• muffler Termokor NEX from 750 rub.

Of course, it is best to spend money on an original AvtoVAZ muffler, although it is 2–3 times more expensive than other models. However, it will serve many times longer, so the driver can decide for himself: buy an expensive one for a long time, or buy a cheap muffler, but change it every 3 years.

Original mufflers are preferable for the VAZ 2106, as they last longer and do not provide the driver with additional problems associated with maintenance

What materials are they made from?

Silencers of all types can be made from:

1. Of stainless steel;
2. Aluminized (alloy of aluminum and steel);
3. 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.

Lada 2107, 241 thousand without capital › Logbook › Replacing the VAZ-2107i injector resonator

Hello everyone, back in the winter on New Year’s Eve the resonator burned out, it was 4 years old, it was inherited from the previous owner, I changed the main muffler about a year and a half ago. I decided to wrap it with asbestos cord until spring, but after a month it burned out, so I wound it again.

Recently it became warmer, and the whipping started again - I decided to replace it.

I bought a resonator made in Tolyatti in advance; the main muffler was from the Seversky Pipe Plant, near St. Petersburg.

It turns out that there are 2 types of injector: Euro-2 and Euro-3. It differs in the bend of the flange and, it seems, in length. Before purchasing, I had to look under the car to make sure I have Euro-2, so the pipe with the flange has a bend, while for Euro-3 it is straight.

For some reason I bought a metal-graphite ring with bolts, which is used to connect the exhaust pipe and the catalyst, in my case they are not needed - the resonator with the catalytic converter has a rigid flange connection. But I think sooner or later they will also come in handy.

I prepared the tools, lubricant and sealant, there was an extra clamp left over from the last time.

With sin, I unscrewed two stuck bolts from the flanges; the clamp on the muffler came off easily, since it lubricated the threads even when replacing the muffler. During removal, the resonator flange completely came off - it was already held on by snot.

I had to unhook the muffler to disconnect the pipelines; the fastening belt broke, but fortunately I have a spare repair kit, also from last time.

The catalyst honeycomb is visible.

Just for fun, I decided to measure the thickness of the metal pipe of the new resonator - it is about 1.5 mm.

It looks well made, the seams are from an automatic machine, for some reason the article number comes from the “six”, although it seems that no injectors were installed on them.

Before reassembling, I lubricated the joints with a thin layer of graphite paste.

During installation, a problem immediately arose - the bend of the muffler began to rest against the bottom of the car - this is the geometry.

I tried this way and that, but still something stuck somewhere - either in the handbrake cable bracket, then in the cable itself, or in the shock absorber.

There was no autogen, to heat it up and bend it, I had to cut off a couple of centimeters from the tip of the resonator pipe with a grinder.

Somehow we managed to move it a couple of centimeters away from the bottom. Before the final tightening, I also lubricated all the bolts with copper grease, and on top of that with graphite grease, and installed new engravers.

I also lubricated the wire securing the muffler belt with pushsal, since everything there also rusts and you have to tear the belt with a mounting tool or saw it.

Upon inspection, it turned out that siphonage was coming from the new resonator at the place where the 2 halves were welded from a small hole of half a millimeter. It was discovered by the condensate coming out - such is the quality of production, they don’t even check the tightness of the seams.

I didn’t have time to drip it with electric welding or cover it with epoxy, I’ll fix it next time.

Subscribe! Good luck on the roads!

Price: 730 ₽ Mileage: 226,000 km

Basic moments

To replace the VAZ 2107 muffler as quickly as possible, you will need screwdrivers, a set of keys and sockets, as well as an inspection hole. If there is none, then you can raise the entire rear of the car as much as possible so that it is convenient to work under it. The main muffler is located at the rear of the car. Its edge is visible when looking at the car from behind. This element must be replaced either in case of severe deformation, as a result of which the ability to pass exhaust gases is greatly deteriorated, or if it is completely burned out, due to which exhaust gases escape from the muffler without being cleaned and noise reduced. Even if there are breakdowns or burnouts, the noise level increases many times. In this case, it is necessary to replace this element.

Replacement

First prepare the tools:

1. WD-40, or another similar composition (even brake fluid or used oil will do).
2. Bulgarian.
3. A set of keys.
4. Hammer.
5. Pliers.
6. Wide flathead screwdriver.
7. Graphite grease.

First, you need to place the machine on an overpass or pit and ensure normal lighting of the workplace. Sequence of operations.

1. Find the connection point between the main muffler and the resonator (near the rear axle).
2. Moisten the WD clamp connecting the main muffler to the resonator. After 15-20 minutes, lightly tap it with a hammer. Do the same with the pipe connection.
3. Remove the clamp, using a screwdriver to help pull the flaring of the silencer off the flaring of the resonator.
4. If the flaring petals cannot be flared, cut them off with a grinder, under no circumstances touching the resonator pipes.
5. Disconnect the muffler from the resonator, using light blows with a hammer if necessary.
6. Disconnect the muffler from the suspension belt and three cushions.
7. Replace the old part with a new one in the reverse order. Make sure that the pipe from the resonator fits completely into the flared muffler pipe.
8. Press the connection point tightly using a clamp.
9. It is advisable to purchase new pillows and install them when assembling the structure. Treat joints and threads with graphite lubricant. This will protect them from moisture penetration and save them from corrosion.

If you need to replace the resonator, then there is nothing complicated either, the only thing you need to remember is that it is not attached to the bottom of the car, so you should hold it while working so that the exhaust pipe does not become deformed.

As a result of proper operation of the muffler, the exhaust gas exhaust system will work properly, the engine sound and exhaust smell will not be irritating.

A clear understanding of the algorithm of actions when carrying out such an event as replacing a VAZ 2107 muffler will help every car enthusiast carry out his plans quickly and without errors. On the one hand, removing the old muffler and installing a new one seems simple, but on the other hand, you need to be prepared for some difficulties.

How are knocking and muffler position related?

If the muffler suddenly starts knocking on some parts of the car, find the source of the extraneous sounds. Usually the reason lies in stretched rubber fasteners. After replacing them, the knocking will stop.

Sometimes a knock appears after work related to removing the muffler. In this case, extraneous sounds are a consequence of installation errors. Round pipes at the joints with clamps can be slightly rotated relative to the correct position: more or less than required, pushed into each other.

To eliminate knocking, restore the optimal position of the exhaust system elements.

Sagging mufflers can be “treated” using similar methods—by replacing rubber bands and correcting the position of joints.

Exhaust system design of VAZ 2107

Like most passenger cars, the VAZ 2107 has an exhaust system consisting of three main parts:

1. a receiving pipe into which gases enter from the exhaust manifolds;
2. VAZ 2107 resonator (additional muffler), where gases are directed from the exhaust pipe and where the exhaust sound is partially reduced;
3. muffler, which absorbs most of the engine exhaust noise.

In addition to the above parts, the exhaust system includes:

• muffler mounting pad;
• pillow bolt;
• muffler suspension belt;
• clamp bolt and clamp securing the muffler to the resonator;
• clamp bolt and clamp securing the resonator to the exhaust pipe;
• clamp bolt and clamp securing the exhaust pipe to the body;
• nuts securing the exhaust pipe to the manifold;
• pad;
• locking plate;

What is a muffler for?

Naturally, making the car sound quieter. Physically, the combustion of a mixture of air and gasoline produces vibrations of different frequencies, from low to high. The sound from the exhaust manifold carries all the energy of sound vibrations into the muffler, which is equipped with several special chambers. Like any wave, the sound from a motor has energy, or amplitude. The higher it is, the noisier the motor is. When it enters the chambers, the sound “gets entangled” and gives up its energy, turning into heat. This is why the muffler parts are so hot, although they are far from the engine, and the exhaust itself from the exhaust pipe is slightly warm. So, the first function is to make the engine quieter.

The second important function is the removal of combustion products, otherwise the mixture will not ignite in the zone of high carbon dioxide content.

The third function is keeping the cylinders clean and ventilating them.

It must be remembered that the exhaust system takes on very large thermal and chemical loads, and parts can “burn out”, since toxic exhaust gases, mixing with condensate, form complex acids, which are very aggressive at high temperatures.

On the outside, moisture, impacts from gravel, salt in winter and other causes also contribute to wear. Those who use their car in winter need to replace the muffler much more often.

What is the design of the VAZ 2107 muffler

The muffler is only part of the exhaust system. Its structure is as follows:

• Exhaust gases penetrate through the exhaust manifold into the so-called “pants” 12, which are called the exhaust pipe. The “pants” are separated from the exhaust manifold by a special gasket 11, which is designed to seal their fastening.
• The pipe is attached to the gearbox using bracket 15.
• Then there is a series of additional resonators, or mufflers, front and rear, which are attached using clamps 7 to the “pants” and 6 to the main muffler. These mufflers cut off certain sounds from high engine frequencies. Together they are called "additional muffler" 13.
• The main muffler (main) 3 is movably fixed to the bottom so that its frequency is not transmitted to the body. This mount can additionally dampen vibrations due to the “sway” of the muffler itself. It is produced using parts 1-4.
• Next comes the exhaust pipe.

Here it should be said that by the color of the exhaust and the condition of the pipe, one can draw certain conclusions about the operation of the engine, just as doctors draw conclusions about the work of the intestines by analyzing stool. For example, if you run your finger inside the pipe and a greasy, oily residue remains, then the oil scraper rings have become unusable and the engine “eats” oil, which is indicated by the black color of the exhaust. Normally, the inside surface of the exhaust pipe is dry.

The exhaust system assembly is shown below:

The main muffler contains numerous chambers consisting of perforated pipes.

The figure also shows the main muffler mounting and extension pad

An important feature of the VAZ 2107 muffler is its complete “interchangeability” with the rest of the classics. If you purchase parts from a VAZ 2101, or any other modification, you can’t go wrong

If your muffler needs replacement, it is better to do this at a service center, and purchase spare parts there so that there is a guarantee for the installation. Simply replacing a muffler is a messy business, especially if you have to start from the “pants.” It is possible that you will need to cut off the stuck joints with a grinder.

A few words about sports modifications of the VAZ 2107 muffler

A conventional muffler is indirect, this increases the pressure in the exhaust manifold and can reduce engine power. At that time, a direct-flow, sports muffler filled with ceramic fiber is able to increase engine power by faster cleaning of the cylinders from exhaust gases. It should be said that the sports muffler of the direct-flow system will never “scream”, and the engine operating volume will be quite acceptable.

Article: 2101-1203025, additional articles: 21010120302500

Order code: 001325

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Today, the next article in the series “Crystal VAZs or typical breakdowns of domestic cars” is dedicated to the “classics”: VAZ-2101, 2103, 2104, 2104, 2105, 2106 and 2107. These cars have been driving along our roads for decades and, despite Despite all the shortcomings that we will talk about, their popularity is still high.

Suddenly, out of the blue, while driving your favorite “Seven” in complete comfort, an incomprehensible “roar” appears at the throttle. The driver turns off the radio and listens. After every press on the gas pedal, the car growls and roars like a tank. After climbing under the bottom, it is discovered that the VAZ 2107 muffler is completely unsoldered, the pipe has moved away from the resonator, and the fastening is broken. If the inside of the exhaust pipe is “jammed” and the removal of exhaust gases is impaired due to a decrease in diameter, then the engine “chokes” and a loss of power occurs.

Differences between the exhaust systems of carburetor and injection VAZ models

Installation of an injection system on a VAZ 2107 required modernization of the exhaust system. Two additional details were added to it:

• an oxygen sensor that determines the composition of the mixture, which is embedded in the exhaust manifold;
• an exhaust gas catalyst (“catalyst”), which is installed in front of the resonator, in the central tunnel under the bottom.

In connection with the installation of the catalyst, the VAZ 2107 resonator (injector) was moved a little back.

The new exhaust system has become a little more complicated, but it allows for a reduction in the toxicity of the VAZ 2107 exhaust and ensures that the car complies with EURO-2 standards.

Advantages and disadvantages of the injection modification of the VAZ 2107

The “Seven” in injection version and with a modernized exhaust system has a number of advantages over the old “carburetor” model. They are as follows:

• thanks to the injector, the engine operates more stable in all modes;
• the specific power and torque of the injection engine are higher;
• the exhaust of a VAZ 2107 with an injection system is cleaner than smoke from a carburetor engine;
• Driving a car with an injection engine is easier, it is not so demanding on the driver’s qualifications and “forgiven” mistakes when operating the gas and clutch pedals.

But installing the injector at the same time worsened some performance characteristics:

• the clearance of the injection “seven” decreased to 7 cm, which worsened its cross-country ability;
• due to the installation of the catalyst, the “survivability” of the exhaust system has decreased;
• the high temperature of the catalyst sometimes causes grass and dry leaves to ignite when the car is stopped.

Advice: to avoid fires, it is necessary to park the injection vehicle so that there is no grass or other flammable debris under it. When stopping, it is better to turn off the engine to allow the catalyst to cool down.

Types of products

You can buy the following types of mufflers for the domestic brand:

• assembly model “Izh-Auto”, which is suitable for VAZ 2104, 2106 and 2107;
• model for a sedan body, which is suitable, in addition to the VAZ 2107, on varieties 2101, 2103, 2105 and 2106.

The following types of exhaust systems are available on the market:

• stamped and welded. They involve stamping two metal parts of the product can, welding them and attaching them to the pipe. Initially, exhaust systems were made in this way, but then the more reliable rolling method replaced it;

Muffler for VAZ 2107 - stamped and welded

• sunset _ Involves wrapping sheet metal around the muffler. Despite the reliability of the method, factory parts are made only by the first method, so you can purchase roll-up exhaust systems separately.

Muffler for VAZ 2107 - sunset

Car engine noise - elimination principle

In addition to the engine, additional noise is created by tires when rubbing against the road, as well as wind flows affecting protruding structures and machine parts. But the operation of the engine creates the greatest noise effect, requiring urgent measures. And the first priority is to carry out insulation in the engine compartment.

This action, as a rule, is included in the general set of measures for the installation of complete sound insulation. However, work can only be carried out on a specific area. Insulation of the engine compartment is the most effective for the entire car and brings the noise level to the optimal level. In this case, the main task is to create a sealed coating when all surfaces of the engine compartment are treated from the inside.

In order to effectively remove car engine noise, it is necessary to adhere to a certain technology when applying materials such as vibration absorbers and, directly, sound insulation. First of all, the partition between the engine compartment and the passenger compartment is processed, as well as the inside of the hood.

Symptoms of a clogged muffler

The blockage indirectly affects all the main systems of the car - it reduces engine power, increases fuel consumption and changes dynamics. Therefore, this problem option should be considered if the machine shows signs of deterioration. Check whether the engine overheats after a short start, whether there is rust or heavy smoke outside.

When the muffler is clogged, the removal of exhaust gases produced during combustion of the fuel mixture is impaired; The natural result of this is a decrease in engine power. The problem is most often encountered by car owners whose exhaust system is equipped with a catalyst (catalytic converter), which reduces the amount of harmful emissions, but also often becomes clogged. Often, a plug occurs in the main or additional muffler, as well as in the pipes connecting them to each other, and the reason for this may be mechanical damage or destruction of internal parts.

Methods for checking for exhaust gas obstructions:

• Measure the outlet pressure.
• Determine the concentration of harmful impurities CO and CH (a measuring device is available in most car services).
• Check the pressure in the converter using an ordinary pressure gauge with a measuring limit of 0.5. The insufficient throughput of the catalyst is indicated by the maximum indicator of the device when pressing the gas pedal.
• Visually inspect the catalyst honeycombs against the light, having previously dismantled it.

Some recent cars have two oxygen sensors (Lambda Probe). In this case, you can check the effectiveness of the neutralizer based on the readings of the sensor located in the lower part (at the outlet). The electronic control unit will show an error if significant problems are detected.

Recommendations for tuning

Problems with the exhaust system, admittedly, occur quite rarely. But sometimes drivers need tuning. When remaking this unit, do not forget about the need to reprogram the ECU. If changes have been made to the design, then you need to inform him about it. Otherwise, interruptions will occur and the injector may behave inappropriately.

Many car owners like to install devices that change the exhaust sound. This is where your imagination can run wild. A device for every taste. You can make the car quiet, or you can turn your horse into a sports car. It will roar like at a race. Mostly young guys love such tricks. This does not bring any benefit to the car. Only the owner’s “rating” increases in the eyes of some public.