Omni pressurizing crankcase

[glhman]

Ok, so here is the whole story. My GLH-T2 is pressurizing the crank case (blowing out the dipstick and shooting oil everywhere). I checked compression, and it has 115 across the board. I replaced the PCV valve, and no change. Made sure there is no clogs anywhere in the PCV system including the baffle inside the valve cover.

When I give it full boost (~13 PSI for daily driving) and shift at 5.5k, the oil goes shooting everywhere. When I shift at 4.5k, it still does it, but not nearly as bad. When the PCV system is disconnected from the valve cover nipple and I shift at 4.5k, it blows the dip stick up ~.25" and very little oil comes out. When I shift it at 5.5k with the PCV removed, it blows the dipstick up ~.5" and just a little more oil comes out, but nothing when compared to before.

My PCV system is what is considered the correct system, and the motor only has around 15k miles on it. I know I need to do a leak down test, but in light of that does anyone have any ideas?

[tryingbe]

PCV and/or by-pass.

Those are the only two thing that can cause your problem.

[glhman]

Quote:

Originally Posted by tryingbe PCV and/or by-pass. Those are the only two thing that can cause your problem.

It doesn't seem like it is either of them (but I know it has to be)

[tryingbe]

What if you leave the valve cover nipple vented to the atmosphere and plug the PCV vacuum port on the intake manifold? What happens then?

[william]

Quote:

Originally Posted by tryingbe What if you leave the valve cover nipple vented to the atmosphere and plug the PCV vacuum port on the intake manifold? What happens then?

What is the purpose of this test?

Ok... you are running a GLH with a TII, so please go into a bit more detail on your exact PCV setup, other than it is "considered to be correct", since it obviously isn't "stock" per se. I have seen what some folks consider correct, and it often confounds me, especially when it comes to PCV systems. Are you running a stock TII airbox from another vehicle? Cone filter? What size of lines are you using for your PCV plumbing? Please give us as much detail as you can.
Although consistent, 115psi seems a bit low for the average build; what head/pistons/cam are you running? With TII pistons and a G head, I am getting 125. I understand consistency is the key thing, but a leakdown test would be helpful to eliminate ring sealing as the problem.

[tryingbe]

The purpose of that test is to determine if the PCV is routed correctly or not without seeing any pictures of his engine setup.

[glhman]

Update: I did a leak down test today, and I have 2% on all of the cylinders

Quote:

Originally Posted by tryingbe What if you leave the valve cover nipple vented to the atmosphere and plug the PCV vacuum port on the intake manifold? What happens then?

That was my PCV disconnected trial. It still blows up the dipstick, but not nearly as much, and very little oil comes out

[tryingbe]

Is your timing correct? Seems odd to have 2% leak down and 115psi. Post some pictures of your engine bay?

[glhman]

My PCV system:

It goes from the valve cover into a T fitting. The left side goes to a PCV valve, and then into the intake manifold. The right side goes through a catch can and then to the intake piping pre-turbo. I know that the catch can should be before the T, but that wouldn't cause this problem.

Quote:

Originally Posted by tryingbe Is your timing correct? Seems odd to have 2% leak down and 115psi. Post some pictures of your engine bay?

I'm at 1 mile of altidute, so that might be effecting it.


Only pic I have for now
DSC02576mod.jpg - Image - Photobucket - Video and Image Hosting

[jim34]

Maybe the pcv valve is sticking open under boost ?

[glhman]

Quote:

Originally Posted by jim34 Maybe the pcv valve is sticking open under boost ?

Checked it by blowing into it, and it closes. A little bit of air escapes, but not nearly enough to cause this. And this is the 2nd valve I've had in there.

[cawcislo]

Quote:

Originally Posted by tryingbe Is your timing correct? Seems odd to have 2% leak down and 115psi. Post some pictures of your engine bay?

It probably seems lwo because he probably did the compression test without having the throttle body open (he simply cranked the engine over). If he held his foot on the gas pedal to the floor I'm sure he would have got 140+ psi as is normal.

[glhman]

Quote:

Originally Posted by cawcislo It probably seems lwo because he probably did the compression test without having the throttle body open (he simply cranked the engine over). If he held his foot on the gas pedal to the floor I'm sure he would have got 140+ psi as is normal.

Nope, I had the throttle body wedged open with a screwdriver handle, and all of the plugs removed. Although it was on an ancient compression gauge (30+ years old).

[glhman]

anyone?

[shadetreeshop]

Burnt rings.

I had a 2.2 that started to push the dipstick out. then it started blowing the cam plug out (soaking the trans)

until finally #2 piston gave up the ghost , blew a chunk of the upper ring land somewhere...

Most likely the cause is too lean with overshots of boost, It's been my experience that TD's love Rich mixtures , and around 13lbs things tend to a little lean (read extra oil from blowby) ... Detonation will bring on your problem also..IIRC 14.5lbs is where the factory ECM stops providing fuel ?