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Positive crankcase ventilation

Updated: 10/25/2022
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16y ago

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Also known as PCV, and commonly associated with a PCV Valve. What is it? A method the engine on your car uses to ensure there is no excessive pressure build-up in your crank case (By allowing it to vent when needed); And also (More important for pollution control) - Redirects that vented gas back into the air-intake system to be burned off as combustion during normal engine operation. The PCV Valve is just a little (usually plastic) one-way vent tube. It allows the engine to release pressure, but does not allow the engine to "Pull" or "Inhale" for lack of a better word, through the same valve. If the engine could not vent excess gas, it would cause all kinds of problems, from stalling to moisture-contaminted oil. If one were to remove the PCV valve, the excess gas would be released into the open air, more causing pollution. The engine it self will continue to run without the PCV valve installed, but there are some down-stream issues with this; Namely the ability for moisture and other pollutants & particulates to re-enter the engine's crank case and mess things up.

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