99C5-HP

I Have A New 427 And Under High Rpm Accelleration It Boots Oil Out Of The Dipstick Tube And Hits The Underside Of The Hood And Leaks All Over The Header . Its Obvious It Has A Crank Case Presure Problem, Wondering If Anybody Has A Fix...i Could Never Race This Thing In This Condition....thanks

allmee

Have you a PCV setup on the motor? If only a breather, it may not be enough to relieve the pressure. I disconnected my PVC line to the intake on my Grand National, to eliminate hot air going in the intake, & started getting the same, oil out of the dipstick at hard accel & high RPM's.

Rob

Chevy Guy

There shouldn't be any real "pressure" like that in the crankcase. If you have oil shooting up out of the dipstick ID say you have a very serious leak down/blow by problem or the engine is about 3 quarts overfilled.

PCV is a positive vacuum system to evacuate the crankcase, its not meant to relieve active pressure.

tiojames

Has to be over filled or compression leaking by the rings.

ISeeRed

I had the same problem on an older Vette......Hate to say it, the motor was new and the rings they used had the wrong end gap...... too much end gap and the thing blew out the dipstick tube every time I got on it. ....you'll see compression is down too....do a compression check to verify!!

allmee

I did give the ring thing a thought also............but that would be such a major drag

99C5-HP

its definatly not overfilled...if the rings aren't seated yet could that be a possibility?and i guess a leak down test would let me know if the rings have a problem?correct..

99C5-HP

=allmee;1563099973]Have you a PCV setup on the motor? If only a breather, it may not be enough to relieve the pressure. I disconnected my PVC line to the intake on my Grand National, to eliminate hot air going in the intake, & started getting the same, oil out of the dipstick at hard accel & high RPM's. Thank you for your help...it has a pcv on the right valve cover that runs to the air cleaner and thats it..the other day i was accellerating hard and it was blowing a serious oil cloud behind me apon decelleration.. when i checked under the hood i saw all the oil on header and all over the engine compartment.. hoping for the best that the oil blowing out from behind me was coming from the oil on the header but after reading a few of these post i'm starting to think the ring/end gap deal is the problem ..I called the engine builder he said put a breather on the oiL fill and that should do, I LOST MY CAR FOR A COMPLETE YEAR SPENT THOUSANDS OF DOLLARS...for this pile.. Rob[/QUOTE]

99C5-HP

thank you .

redtopz

You might try sending a pm to RichieRichZO6 on this forum. He had the same problem a few weeks ago and is in the process of correcting it right now. Plus he works at a chevy dealership and knows his stuff.

99C5-HP

THANKS, I appreciate the help...you could only imagine the fustration after waitig so long for it to be finished and i got a crop duster back...that stains my driveway...

David426

Who did the work on the engine?? I'd raise cain..

99C5-HP

IF I TOLD YOU YOU WOULDN'T BELIEVE ME.....

ISeeRed

you can't just drop that bomb and not tell us......If you don't want to go public---At least PM me the answer!

foxycar

Try driving it with no oil that should solve the oil leak! P.S Who built the motor?

rustyguns

mickey mouse?

foxycar

Maybe Miney Mouse

foxycar

I WOULD BELIEVE YOU!!

foxycar

Was this engine installed up side down? that would cause oil to leak.

rustyguns

well...you could get a morosso vacuum pump for the engine

do a compression test and check valves and then do a leakdown test, double check the PVC system G/L !