pcv question

[Fred T]

Originally Posted by GREASEMONKEY72

i dont mean to steal your thread or anything but i was just wondering do you even need the pvc? or can i run without it, would it make a difference in performance or anything? and btw that pcv looks cool

The Positive Crankcase Ventilation is a feature that you want on your vehicle. It does have a small negative effect on performance. What it does is use the engine vacuum to suck oil fumes from the crankcase through the engine, burning them in the process. If you simply disconnect the system, pressure will build in the engine, causing gaskets to blow out and leak.

Before the PCV system, engines had a breather and a road draft tube, which pulled air through the engine on the highway. Any time you stopped, oil condensation formed on the draft tube and dripped on the driveway.

The line to the air filter is for filtered fresh air to enter the crankcase. There is also a vacuum line that connects to the PCV valve, where the vapors are sucked out of the engine.