Thread: PCV size?

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Ok, just finished reading a wonderful article in wiccopedia ( sp ? ) about the PCV, and I actually learned a thing or two. Not a small accomplishment considering how long I have been dinking with engines. Anyway..

couple of questions come to mind: Is there any advantage from a performance stand point to having the vent to atmosphere as compared to the breather? I am assuming that you would have a slightly enriched fuel mixture by running the vent to the breather.

Second: how does one choose the appropriate PCV for a modified engine? Any suggestions for a chev. 350 with mild cam?

Also< I don't think I'll ever wrap my brain around the fact that the intake has almost no vacuum at WOT, but I do accept it as I have heard it too many times. SO.. that being a given: the sizing of the PCV is only relevent at idle-to-part throttle?

hi. if you pull the pcv out of the engine while it's running and put your finger over the hole in the valve that is sucking, then you should have a slight drop in engine rpm and that all you need for everything to work right. good luck .dave

at insane rpm's then letting completely off the throttle oil will blow out of the rubber grommet around my pcv. never had this happen until the rebuild got me way morer hp than previously.