Positive Crankcase Ventilation: Description and Operation

Positive Crankcase Ventilation System:

PURPOSE
A Positive Crankcase Ventilation (PCV) system is used to provide more complete scavenging of crankcase vapors.


OPERATION
Fresh air from the air cleaner is supplied to the crankcase, mixed with blow-by gases and then passed through a metered orifice into the intake system. Once in the intake system the mixture is then added to the intake fuel/air charge and burned in the combustion process.