Glenn & List,
For the Buick, I have purchased a Peterson adjustable vacuum regulator
to regulate crankcase vacuum, its range is from as high as 29.7 in/hg
down to 2 in/hg.
They (NASCAR) have changed valve guide and seal materials just so they
can run the high numbers. Of course sucking the oil from the valves is
not a good thing and not my idea of chances I'm willing to take. I
already run 5 wt oil which doesn't leave much room for error.
Aside from sucking oil down the valve guides, these high vacuum readings
are the reason most NASCAR engines do not use gaskets, (especially thick
gaskets) it's metal to metal with a little RTU for looks.
Another point I should make is that on a dry sump pump you have one
stage that is pumping the oil to the engine. Then there is multiple
scavenge stages, up to 5 are common, that vary in width (capacity), that
do the vacuum. Therefore, a typical pump can pump minimal oil with high
vacuum capabilities without major HP concerns.
Grib
"Do what others Won't and you'll do what others Can't for the rest of
your life"
-----Original Message-----
From: owner-land-speed@autox.team.net
[mailto:owner-land-speed@autox.team.net] On Behalf Of Glenn Ridlen
Sent: Sunday, January 26, 2003 1:19 PM
To: land-speed@autox.team.net
Subject: RE: Dry sump
Whew Russ
Inches of mercury would be a bunch.......might suck the bottom of the
pan up til it touches the crank.....maybe that's the limiting
factor. LOL 20 inches of mercury would be almost 10 psi. I always
thought it was inches of water but what do I know......maybe it is
mercury.
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