crankcase pressure under boost ?
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
That kind of blowby at 5-6psi of boost is unusual. You need to do a leak-down to confirm (or not) a bad cylinder. As you get past 10psi there'll be blowby which could be considered normal but not at the level you describe and definitely not at your boost levels.
Also, and you may as well check this out first, check your pcv and confirm its working correctly. To isolate just disconect it and plug the intake where it had been connected.
Hope everything turns out to be all good
Arnel
Also, and you may as well check this out first, check your pcv and confirm its working correctly. To isolate just disconect it and plug the intake where it had been connected.
Hope everything turns out to be all good
Arnel
Melting Slicks
Joined: Mar 2006
Posts: 2,130
Likes: 0
From: NJ New Jersey
i had a maggie on my car and i got blow by and it resulting in the oil shooting out from my dip stick, and 3 cracked pistons and a cracked #5 cylinder wall.. but that was b/c my motor was whipped already really bad.... lol
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
Have you had the turbos for a while, and it just started doing this, or did this happen as soon as you put the turbos on?
Where is your oil return from the turbos hooked up?
Edit: Oh, and you don't still have the crankcase air supply connected to the throttle body, do you?
Where is your oil return from the turbos hooked up?
Edit: Oh, and you don't still have the crankcase air supply connected to the throttle body, do you?
Last edited by Warp Factor; Apr 16, 2006 at 07:13 AM.
Thread Starter
Racer
Joined: Apr 2006
Posts: 383
Likes: 0
From: los angeles calif.
i have had the turbo's one for 3 weeks blow by was not that bad at frist it did blow the dip stick i used tie's to hold it down. then i put on the catch can it got worse. no i don't have the air supply going to t/b. thanks for feedback ill check the filters! p.s keep it comin
Safety Car
Joined: Aug 2004
Posts: 4,067
Likes: 62
From: Houston Texas
Doesn't sound good my friend to have that much blow by at 5.6 psi, I would take quick's advice go with a one way krank vent valve to a vented catch can or to the atmosphere off the valve cover. That will definitely help, but I afraid it is not going to be the long term answer, you may end up having to swap out some pistons.
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Safety Car
Joined: Aug 2004
Posts: 4,067
Likes: 62
From: Houston Texas
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
Originally Posted by gary buchanan
02 Z at 5.6 lbs. of boost blows oil avery where, i put on a catch can blew oil out of the filter, any cures welcome !!!
If you have have the stock PCV system intact, without a one-way check valve in-line, you will be pressurizing crankcase.
Charlie
