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dwcsr · 09-26-2008, 04:16 PM

Yes they are very neccessary.
Their main function is to draw off any unburned gasoline that make make it by the rings or bad pump and vent it back into the engine. If you have ever seen a oil pan grenade and blow off an engine you know how useful that $4 part is. Having breathers on a valve cover and no PVC helps with the pan detenation process.

Vacuum in the crank case also helps seal the rings.

09-26-2008, 04:16 PM	#2
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,131	Re: Are PCV's necessary? Yes they are very neccessary. Their main function is to draw off any unburned gasoline that make make it by the rings or bad pump and vent it back into the engine. If you have ever seen a oil pan grenade and blow off an engine you know how useful that $4 part is. Having breathers on a valve cover and no PVC helps with the pan detenation process. Vacuum in the crank case also helps seal the rings.