Possibly Causes of Over Pressurize Crankcase
Registered User
Joined: Mar 2010
Posts: 1,309
From: South-central Pa.
Jmho but this is the the only logical explanation. Everything else is just working around the problem. I would perform the leak down test and then you will know for sure. Oil drain back due to plugged oil passages makes no sense to me. How much oil would it take to fill the intake valley to leak out of the intake? Wouldn't be anything left in the pan! However, I do believe the extra PVC valve would disguise the symptoms of poorly sealing rings. If your only consideration is to eliminate the oil blow by, then the extra PVC is a good option. If you are concerned with the amount of power you lose with poorly seating rings then I would do the leak down test. Let us know how this works out.
http://www.jegs.com/i/Moroso/710/25025/10002/-1
I know engine builders that put these in every engine they built are they anticipating badly sealed rings on a $60,000 motor.Unfortunately I didn't know what they were for until I had this problem.My engine starts as soon as I hit the key I hardly hear the starter is that a sign of the rings being bad being bad for 6or 7 years?
What dose jmho mean?
Administrator
Joined: Oct 2009
Posts: 42,475
From: Poteau, Ok
JMHO=Just my humble opinion. There are many trains of thought on the vent tubes and most say not to do it on a street engine. They are more for redirecting oil to the back of the galley than for additional venting.
Registered User
Joined: Dec 2012
Posts: 1,605
From: Fuquay Varina NC
If poorly seated rings are the only cause then why do they make these.
http://www.jegs.com/i/Moroso/710/25025/10002/-1
I know engine builders that put these in every engine they built are they anticipating badly sealed rings on a $60,000 motor.Unfortunately I didn't know what they were for until I had this problem.My engine starts as soon as I hit the key I hardly hear the starter is that a sign of the rings being bad being bad for 6or 7 years?
What dose jmho mean?
http://www.jegs.com/i/Moroso/710/25025/10002/-1
I know engine builders that put these in every engine they built are they anticipating badly sealed rings on a $60,000 motor.Unfortunately I didn't know what they were for until I had this problem.My engine starts as soon as I hit the key I hardly hear the starter is that a sign of the rings being bad being bad for 6or 7 years?
What dose jmho mean?
Thread Starter
Registered User
Joined: May 2009
Posts: 1,452
Jmho but this is the the only logical explanation. Everything else is just working around the problem. I would perform the leak down test and then you will know for sure. Oil drain back due to plugged oil passages makes no sense to me. How much oil would it take to fill the intake valley to leak out of the intake? Wouldn't be anything left in the pan! However, I do believe the extra PVC valve would disguise the symptoms of poorly sealing rings. If your only consideration is to eliminate the oil blow by, then the extra PVC is a good option. If you are concerned with the amount of power you lose with poorly seating rings then I would do the leak down test. Let us know how this works out.
I never got a change to do a leakdown test, I ran into some other non Oldmsobile problems towards the end of the season last year so the Cutlass took a back seat. I'll work on doing a leak down test.
I ran a compression test and it held good number across all 8 cylinders. Not sure if that's relevant at all though.
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