
7 Intake and exhaust systems
7.1 AIR CLEANER AND SILENCER
General requirements
Efficient removal of dust particles from the considerable
quantities of air flowing into the engine is of vital
importance. Otherwise, their presence would contribute
to internal abrasive wear, especially between the work-
ing surfaces of the cylinders, pistons and rings. It has
therefore been long-established practice to install an air
filter unit on the intake system of motor vehicle engines.
The air cleaner is also required to act as a silencer for
the carburation system; that is, it must suppress engine
induction noise to an acceptable low level. With small
throttl ...