Sorry for the delay in reply. Hope this is the final note on Dry Sump
Attributes.
I only repeat what I get from the Engine Builders, and comments are that
the greater the vacuum, the greater the loss of oil from the top end.
This includes wrist pins as well as valves. Most recent reply was "I
can't tell you the reason, only the result"
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 Elon
Sent: Sunday, January 26, 2003 11:12 PM
To: LSR-List
Subject: Dry Sump stuff
Grib said (snip...)
More (crankcase) vacuum means more HP, till you get to an amount that
you
start pulling oil past the valves.
I just don't see how that can happen, Grib. (For simplification I leave
out
both ram tuning on the intakes and exhaust). The pressure in the
intake(at
WOT) should be close to atmospheric. And the vacuum you mention would
be
throughout the valve covers as well as the crankcase. So the delta P
will
always be preventing oil from being sucked "down" the valve guides. In
other
words the vacuum around the valve stem is greater on the outside (under
the
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