[s-cars] Bypass valves - Which one?

[tblack]

Guys, By returning the oil to the sump implies a closed system, as per
Mihnea's comment re: UK S2. Should there not be a means of exhausting the
pressure build-up in the crankcase? It seems highly desireable to not vent
to the intake system as is the case with our cars. What is the solution?
Tom Black.

----- Original Message ----- 
From: "Mihnea Cotet" <mik at info.fundp.ac.be>
To: <QSHIPQ at aol.com>; <tfrank at symyx.com>; <russ at panneton.name>;
<pizzoman at yahoo.com>
Cc: <CaptMagu at aol.com>; <s-car-list at audifans.com>;
<gary.m.lewis2 at BOEING.COM>
Sent: Monday, December 08, 2003 2:30 PM
Subject: Re: [s-cars] Bypass valves - Which one?


> Yup Scott, agreed, but what about using a catch tank with a return line to
> the oil pan??? A friend of mine from the UK with a 400 HP S2 has done
that,
> the idea is excellent as the oil consumption is reduced to almost nothing
> (barely what gets burnt in the chambers due to tired piston rings).
>
> Just a thought...
>
> Mihnea
>
> At 14:20 8/12/2003 -0500, QSHIPQ at aol.com wrote:
> >Actually Minhea, small amounts of oil, even in vapor form, are enough to
make
> >a difference.  In vapor form, it's now part of your 'Air' in the A/F
ratio.
> >Given what I see in perfectly good CIS cars with wet oil PCV, I'm not
with
> >your conclusion.  Oil also tends to help exacerbate hotspots in the
> >combustion
> >chamber.
> >
> >Put another way, when you see perfectly good I5's at the track emptying a
> >quart of oil from a catch can per day, where would that oil go without
> >one?  Ever
> >wonder why at track events, oil consumption reaches extremely high levels
in
> >a perfectly normal S car?  I don't.  I might add that reducing the
> >aeration of
> >the oil is key as well (read:  Big oil coolers = good).  For more on this
SAE
> >970922  Development of Modern Engine Lubrication Systems - coauthored by
Uwe
> >Geiger Audi AG
> >
> >SJ
> >
> >
> >In a message dated 12/8/2003 1:10:03 PM Central Standard Time,
> >mik at info.fundp.ac.be writes:
> >Though, with regards to detonation/pre-ignition, I guess it would take
> >$hitloads of oil puking through the breather in order to produce
> >detonation, but then it would mean that the engine is so FUBAR that it
> >doesn't need to have any performance anymore...
>
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