
INTAKE AND EXHAUST SYSTEMS 143
tion of commercial vehicle diesel engines. In this context
it must be remembered that a diesel engine always
requires a full charge of air regardless of its operating
load, so that the temperature of compression is high
enough for efficient combustion. A partially clogged air
filter can therefore have a more detrimental effect on
the performance of a diesel engine than it would with a
petrol engine. Pre filtering of the air is typically ac-
complished by an integral cyclone unit, the tangential
vanes of which impart a spinning motion to the through
flow of air and cause the heavier dust particles to be
separate ...