[s-cars] Re: [Audi20V_Kruemmer] was: NEW MOTOR-Oil in breather system- UPDATE

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Hi there,
i have discovered a similar thing on my (and other) 10V MC engines.
Since i have upgraded my breather system with some 90° hose fittings, the amount of oil entering the CIS intake boot, is way less than before. The hose from the valve cover to the intake boot & the hoses to the turbo intake are now completely dry & without any traces of oil etc.

But...,

oil can still be found in in the hose from IC to intake manifold after the turbo!
My suggestion is that: oil is not only vented by the breather system, but also by the turbo itself.
Seems like under high boost & high oil pressure, some oil is blown around the oil gaskets inside the compressor housing into the turbo exit hose.
It may be difficult to realise this problem on the 20V engine, as the breather hose is routed directly to the turbo intake.
On the 10V engines, this hose is first routed to the CIS rubber boot, so that oil can normally be found in the turbo intake hoses as well (and not only after the turbo).

HTH

Greetings,
Olli W.





  ----- Original Message -----
  From: brian bilotti
  To: s-car-audi-kruemmer ; s-car-list at audifans.com
  Sent: Friday, September 12, 2003 11:01 PM
  Subject: [Audi20V_Kruemmer] was: NEW MOTOR-Oil in breather system- UPDATE


  Ladies and Gentlemen,
  Specifically Mark Halligan, Jani Peltopuro, Tommy
  Arnberg, and the rest of you gearheads, you know who
  you are. Here's an update, it seems that this oil in
  the breather system issue is shared by several others
  and I suspect that everyone has this issue but it is
  excasperated by higher horsepower/boost pressures. As
  most of you know, I have been driving around with a
  clear, vented bottle with a hose attached to the front
  of my valve cover (replacing the valve cover to turbo
  hose). While driving with a full crankcase (top of
  hash marks)this bottle would partially fill, 1/4 of a
  quart. This would occur only under boost conditions.
  At the same time I monitored the oil level on the
  dipstick and once it got to half way on the hash
  marks, NO MORE OIL went in the bottle. Nada, zip,
  zilch. Hmmm, it has been suggested that I might have
  the wrong dipstick or the dipstick tube was elevated
  somehow, NOPE. I checked both with a friends S4. Soo,
  it seems the next step is to add a breather bottle and
  eliminate any chance of oil going through the intake
  system.
  My recommendation to anyone running higher boost is to
  check your intake hose coming from your IC and going
  to your throttle body and see if there's an oil film
  in there. If so, you're pumping oil into your
  combustion chambers and we all know that's not a good
  thing. I welcome anymore comments or advice.

  May the rings be with you

  Brian

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