crank case venting problems
Thread Starter
Instructor
Joined: Feb 2008
Posts: 131
Likes: 1
From: Anderson IN
crank case venting problems
i recenly installed 1:6 roller rockers on my 1990 L98. i did all the mods to the valve covers and with no baffles i went with a standard breather with a baffle and a snout to hook up to the TB. i had to use a larger hose with this set up (5/8). everything to running good other than at mid to hi RPM (5500) i am blowing oil out of my dip stick tube. i am at a loss any thoughts?
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
The pcv vac port is the one on the intake base connected to the drv side valve cover
Be aware that if you run an open breather connected to this port you now have a big air leak as the air into the engine will be UNMETERED
The air from the TB port is metered so the ECM can allow for it in it's calcs.
Last edited by rodj; Feb 20, 2009 at 06:12 PM.
Thread Starter
Instructor
Joined: Feb 2008
Posts: 131
Likes: 1
From: Anderson IN
mine is a MAP car it should just pick up the different density reading if i run a open breather. the TB side (pass side) is connected strait from the valve cover to the TB. correct me if i am wrong but it think thats how it works.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Put your finger over the hole and see if it has vac ????
Pcv vac is on drv side as stated.
The MAP cars still ran a closed PCV system from the factry.
