Crankcase venting?
Thread Starter
Instructor
Joined: Jul 2003
Posts: 153
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From: Tecumseh, OK USA
Crankcase venting?
I have a stupid question... Is it possible to build up oil pressure at higher RPM's and have an oil leak only when you have your foot in it? Does the crankcase pressurize? I only run about 50/60psi going down the road on my worn 350. Seems like I've developed a leak that I only "smell" occasionally. Couldn't see anything from the topside (so I didn't think much of it), but when I crawled underneath to change the oil my freakin' headers were stained and the bottom of the car was wet. 
Looked like the timing chain cover was leaking where it meets the oilpan!? Should the oil fill cap be vented? Does it matter? I could hear the PCV rattling like normal... does ANY of this question make sense?? 
Thanks in advance...
Looked like the timing chain cover was leaking where it meets the oilpan!? Should the oil fill cap be vented? Does it matter? I could hear the PCV rattling like normal... does ANY of this question make sense?? Thanks in advance...
Team Owner
Joined: Jul 2001
Posts: 182,997
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From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
The crankcase does pressurize.. It's even worse if your rings don't seal perfectly... Open style breathers might help, but a crankcase evacuation system is best against crankcase pressure. However, such system only works with open exhaust...
Melting Slicks
Joined: Jul 2002
Posts: 3,128
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From: Deltona (son of Deland and DAYTONA) FL
If your PCV (Positive Crankcase Ventilation) is functioning, there should be no need for regular breathers. At higher RPM the oil pressure will be a little higher AND if your front seals are seaping the balancer could be flinging it into the path of the headers.
Thread Starter
Instructor
Joined: Jul 2003
Posts: 153
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From: Tecumseh, OK USA
crankcase evacuation system??
Originally Posted by GrandSportC3
The crankcase does pressurize.. It's even worse if your rings don't seal perfectly... Open style breathers might help, but a crankcase evacuation system is best against crankcase pressure. However, such system only works with open exhaust...
