Engine – Cayenne V8
Page 1.35
Positive Crankcase Ventilation – Naturally Aspirated Engine
Positive Crankcase Ventilation - Turbo Engine
The positive crankcase ventilation system in the Cayenne Turbo can
reduce the amount of fuel that goes into the engine oil during combus-
tion. The aeration and ventilation system (Positive Crankcase Ventilation-
PCV) ventilates the crankcase with a steady stream of fresh air, which
accelerates the evaporation of fuel that is carried in.
For this purpose, fresh air is removed between the charge air cooler and
throttle valve and is delivered to the crank chamber via a line. The
pressure that exists at any time between the removal position and the
crankcase causes a steady flow of fresh air through the crankcase. To
ensure enough vacuum in the crankcase in all operating states, the
vacuum in the intake manifold is used in the part-load ranges. A
pressure regulating valve regulates this vacuum until the required value
is reached. The vacuum from the compressor is used in the boost range
(no vacuum present).
1 - Return connection for blow-by gases
2 - Return line
3 - Tank vent
4 - Positive crankcase ventilation
1 - Return connection for blow-by gases
2 - Return line
3 - Tank vent
4 - Positive crankcase ventilation
5 - PCV connection
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