The exhaust system of a vehicle, often also called exhaust system or silencer system, must be type-approved. It is precisely matched to each engine in order to achieve optimum engine performance with the prescribed noise reduction.
The exhaust system has the following tasks:
The up to 1000° hot exhaust gases still have an overpressure of approx. 5 bar. Without silencing, loud noises occur, whose energy is slowly extracted and whose vibrations are reduced.
Therefore, different types of damping are required for the different frequencies:
Most silencers are therefore a combination of several silencing types.
The main silencer is mainly used for actual silencing. All types of silencing can be installed in it. In the cut-open model you can see the inlet pipe with lateral perforations (interference). In addition, the perforated pipes are surrounded by silicon-based sound absorbing material. Due to the friction on the absorbing material, the sound waves lose vibration energy. The sound waves are reflected at the back of the wall.