1 Front exhaust pipe ("pants")
2 Pre-silencer or catalytic converter (on engines with lower power without a catalytic converter, there is simply a section of pipe in this place)
3 Main muffler
4 Additional muffler
Four- and five-cylinder engines have similar exhaust systems. List of parts:
- The exhaust manifold is mounted on the cylinder head.
- It continues with the front exhaust pipe, which, depending on the modification, is made in the form of a single or double pipe.
- Next comes the catalytic converter with a short pipe section. On cars without a catalytic converter, there is a small pre-silencer or a straight pipe section.
- The middle and end mufflers are connected to each other by a short section of pipe. For repairs, these parts are sold separately. On some models, the section of pipe before the middle muffler has a narrowing.
Service life of the exhaust tract
The rate of corrosion from exhaust gases decreases with decreasing exhaust gas temperature. From this point of view, less harm is caused by short trips with stops and engine cooling than by long-term movement with a warm engine and constantly hot exhaust gases. However, during cooling, condensation forms in the mufflers, which, mixing with combustion products, forms aggressive acids that corrode the metal of the exhaust stroke from the inside.
Regardless of the driving mode, moisture from the outside causes rust. Stone hits or driving over uneven surfaces also shorten the service life of the exhaust system, as well as vibration caused by defective suspension rubber or poor engine mounting.
[The original version of the article is posted on the website audimanual.ru]