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

[Trevor Frank]

Totally agree, and the oil guy's will tell you that contaminating the
intake gasses with crank case vent is a problem.. i.e. it contaminates
the oil and causes premature breakdown.  Crank case vent into the intake
stream isn't good for any motor, or it's oil.  The only benefit that I
can see is that it's a cheap way to get vacuum, so there may be a
performance benefit there, also as the motor goes bad..and starts to
vent more i.e. get more blow by, it is accounted for by the maf.  This
way an old motor will still have good programming seeing as all the
gasses are still accounted for by the maf..at least at idle, because I
believe your maf isn't contributing anything other than a full 5v signal
much past 300hp or so, rs2 or stock.

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Djdawson2 at aol.com
Sent: Tuesday, February 22, 2005 7:22 AM
To: strangconst at rogers.com; cpayne at bconnected.com;
s-car-list at audifans.com
Subject: Re: [s-cars] Crank Case Pressure and Turbo Smoke?

In a message dated 2/22/2005 6:43:58 AM Mountain Standard Time,
strangconst at rogers.com writes:

> Which way is that pipe (off the valve cover to the MAF-Turbo hose)
designed
>
> to flow.

It is supposed to flow into the turbo inlet... any crankcase pressure is

supposed to be relieved by this flow.

> It should pull air out of the clean intake stream or is it designed to
just
>
> vent gases to the intake stream.
>

It is designed to pull gases through the intake stream.  The crankcase
can
effectively be vented to atmosphere.  Recycling it through the intake is
a means
of lowering pollution.  There is almost always a vacuum in the turbo to
MAF
hose.  This is where the WGFV also gets vacuum to hold your wastegate
shut
under boost.
HTH.
Dave in CO
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