PCV System, The Lungs of Your Engine.
Before PCV was invented, blowby vapors were simply vented to the atmosphere through a “road draft tube” that ran from a vent hole in a valve cover or valley cover down toward the ground.
The major component in the PCV system is the PCV valve. It consists of a simple spring-loaded valve with a sliding pintle inside. The movement of the pintle up and down changes the orifice opening to regulate the volume of air passing through the PCV valve.
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