[s-cars] Crank Case Pressure and Turbo Smoke?

[Paul Gailus]

I think that trying to make the oil return line have a continuous
downward slope is a good idea.
The oil out of the turbo bearings can get aerated and foamy at high
shaft RPMs. If there's a low spot on the return line, then this
might trap clumps of foam that could then get pushed up the hose
into the turbo by crankcase pressure. And it may not take much
pressure to push up some relatively light oil foam.

Maybe you can try some table experiments on this with Guinness Stout  ;-)

Paul

----- Original Message ----- 
From: Cody Payne <cpayne at bconnected.com>
To: <s-car-list at audifans.com>
Cc: <JShadzi at aol.com>
Sent: Thursday, February 24, 2005 1:17 PM
Subject: RE: [s-cars] Crank Case Pressure and Turbo Smoke?


Gents,
Well so far no luck here...still smoking and small seepage of
oil on the hot-side.

So far I have:
-1) Fixed small drip on Oil Return line in the hopes that the oil was
hitting the hot side turbine
http://worldsbeer.com/urs4/P1010023.JPG

-2) Replaced the Valve Cover PCV return line with an open air breather
http://worldsbeer.com/urs4/P1010030.JPG

-3) Placed on .04" Oil Restrictor on the high pressure oil feed
http://worldsbeer.com/urs4/P1010019.JPG

But oil still seems to be coming out between the center section and hot
side:
http://worldsbeer.com/urs4/P1010029.JPG

Ola over at ITS states "....most likely it is leaking due to oil level
inside the bearing housing is able to reach the area of the piston ring
seal, this "seal" which is not there to keep oil in, but to keep
pressure from the exhaust out, cannot stop the oil from flowing past
it."


My next thing to try is to shorten the Oil Return hose so that it has a
downward sloping angle all the way and doesn't flatten out at all:
http://worldsbeer.com/urs4/P1010017.JPG

If that doesn't work I either have:
-1) Bad PCV Valve (Any write-ups here on changing that?)
-2) Bad Turbine oil seal
-3) Thicker oil? Running M1 10W-30


Any other thoughts?

Thx Guys 

Cody
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