Pcv System

Some articles on pcv, pcv system:

Crankcase Ventilation System - Components and Details
... The PCV valve is only one part of the PCV system, which is essentially a variable and calibrated air leak, whereby the engine returns its crankcase combustion gases ... The PCV system is not a classical "vacuum leak" ... The PCV system just diverts a small percentage of this air via the breather to the crankcase before allowing it to be drawn back in to the intake tract again ...
Crankcase Ventilation System - Positive Crankcase Ventilation (PCV)
... The PCV system and its control valve were invented to meet this need, but no need for it on automobiles was recognised ... built many tanks during WWII, recognized that installation of PCV on vehicles could bring the first major reduction in automotive hydrocarbon emissions ... After confirming the PCV valves' effectiveness at hydrocarbon reduction, GM offered the PCV solution to the entire U.S ...

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