Exhaust system VAZ-2109: purpose, device, technical characteristics, features of operation and repair

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

VAZ-2109 is perhaps the most famous Russian-made car. This car has been produced since the days of the USSR. It was the first car where the torque was transmitted to the front rather than the rear wheels. The car is very different in design from the usual "classics". But is the VAZ-2109 exhaust system so different? The device, purpose and features of the system will be described later in the article.

What do you need?

The main task of any exhaust system is to exit the exhaust gases from the combustion chamber of the engine. In this case, the temperature of the gases decreases on the way to the external environment. Their sound also decreases, thanks to additional elements (we will consider the device of the VAZ-2109 exhaust system below). The design of this system is not complicated, but it is impossible to do without it.

Device

In total, this system includes several elements. This is:

• Exhaust manifold. This is the very first detailthrough which the gases pass after combustion. The collector is popularly called a spider for its characteristic shape. This element is supplied to each of the four cylinders of the internal combustion engine. Further, all these pipes are combined into two, and then into one single one. There are also sports manifolds with a 4-2-1 exhaust pattern. They are installed to add power. As practice shows, gases move more freely along the path, however, the driver will still not feel a significant increase in power.
• Downpipe. It connects to the collector. Inside this pipe there is a special probe. This is an oxygen sensor, or lambda probe. If we talk about the VAZ-2109 exhaust system (carburetor), there is no such sensor in the system. But on auto injectors, a lambda probe is required. The slightest problems with it may be accompanied by a "Check Engine" lamp on the instrument panel. In fact, the receiving pipe has the simplest device. There are no sound-reflecting baffles or special fillers. This is an ordinary hollow pipe, which can accommodate a single sensor.
• Catalyst. As in the previous case, this element is present only on injection versions. There is no catalyst on carburetors. What is this element for? Its main task is to reduce the concentration of harmful substances in exhaust gases. Passing through the catalyst cells, harmful metals turn into harmless oxides. Thanks to the use of this element, the machine began to comply with the environmental standard Euro-2 and higher. The catalytic converter is the most expensive element in the exhaust system. VAZ-2109 (injector). Therefore, when it malfunctions, many install flame arresters or simply knock out the core and weld the walls, leaving the catalyst empty inside.
• Resonator. This element is present on both carburetor and injection versions. A resonator is installed behind the catalyst. What is his task? The resonator serves to absorb the main noise from the exhaust gases. Thanks to this element, the sound of gases becomes less. The resonator is simple. This is a metal case, inside of which there is a perforated pipe. Additionally, there may be a partition inside.
• Main muffler. The resonator can be called an auxiliary muffler, but it is the last muffler located under the rear bumper that absorbs the main sound energy. It enters the resonator and absorbs up to 90 percent of the sound. This element is somewhat more complicated. Perforated tubes are also taken as a basis here, but there are several of them, as well as cameras. Usually these are three or four tubes and two cameras. Passing through this maze, the gases lose their energy and exit silently.

Faults

Due to its simple design, this system is very reliable and rarely needs attention. But nothing lasts forever, so over the years, the muffler and other elements burn out. Most often, it is the muffler that fails, as it takes on the entire blow. It can burn both outside and inside. In the latter case, you can determine the breakdown by the loud sound of the exhaust. Riding with such a silencer is not dangerous, but not very comfortable. Firstly, noise insulation suffers, and secondly, gases can break through into the cabin. Therefore, it is better to replace this element immediately, given that it costs a penny.

About renovation

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

How to replace?

Based on the above, we can conclude that the best muffler repair is to replace it. This statement is also relevant for other parts of the VAZ-2109 exhaust system. The muffler is replaced if there is an inspection hole, a spanner wrench for 13 and an end head with the same size. All actions are performed step by step:

• The car is driven into the inspection hole and put into gear.
• The main muffler is disconnected from the resonator. To do this, you need to find a clamp. The fixing nut is grabbed with a spanner wrench (to prevent scrolling). At this time, the bolt is unscrewed with a ratchet.
• After the fasteners are removed and the elements of the exhaust system are disconnected. The clamp is reusable, so we will put it back.
• The front part of the muffler is carefully removed from the rubber "pillow",through which the part is attached to the body. Then the same operation is done with the front "pillows".
• If the muffler is stuck to the resonator tube, it can be rotated counterclockwise and vice versa. This makes it easier to remove the muffler.
• A new element is installed in reverse order.

Please note that rubber pads may be torn. It is better to buy a spare set. On the "nines" they are very flimsy. It is advisable to put pillows made of durable material (for example, polyurethane). This will not affect comfort (there will be no more vibrations), but the resource is at least twice as large.

Changing the resonator

To do this, we need a basic set of tools (open-end wrenches and heads), as well as a viewing 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 with the muffler on one side and with the catalyst on the other. You need a wrench to unscrew a couple of bolts. Then we raise the resonator and disconnect it from the rubber pads. If the resonator does not lend itself, you need to use a flat screwdriver. With it, we can gently 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.

Catalyst

Replacing the catalyst on the "nine" is an inexpedient operation due to the cost. It is much cheaper to replace this element with a flame arrester. Exhaust systemVAZ-2109 (injector, 8 valves) will not change its characteristics, while the exhaust will still be quiet. The only thing that will change is the toxicity of gases. Exhaust will be more caustic. So, what is needed for this? The catalyst itself is removed first. To do this, you again need a set of keys and a viewing hole. After unscrewing all the fasteners, the part gets out. In its place is a flame arrester. A ready-made flame arrester is ideal in size. There are a lot of these sold in stores.

Tuning

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

As a result, the 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 straight-through muffler, all gases go directly to 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 silencer after upgrading the motor. 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 putting forward flow on a simple VAZ engine. Regular exhaust system and so cope with the exhaust from a simple naturally aspirated engine. In the case of installing a turbine on the "nine" suchrevision is simply necessary.

Conclusion

So, we looked at how the exhaust system works on the VAZ-2109. As you can see, the design of this system is very primitive, and therefore all repairs can be done by hand.