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Re: Oil Aeration

Subject: Re: Oil Aeration
From: Dave Dahlgren <>
Date: Thu, 11 Sep 2003 06:03:40 -0400
I am not sure what you are asking here.. But a dry sump is used for
many reasons, first and foremost is the feature of a reliable oil
supply regardless of vehicle attitude or g loading. the second is to
scavenge the engine of oil so that it will not be aerated by the
engine components such as the crank and con rods. You can scavenge the
oil to the point that there is a reduced crankcase pressure compared
to atmospheric and most do this to some degree or another. How much is
good and where the line is as to a pressure that is too low is always
a subject of debate. Just remember that there are a lot of parts that
are both lubed and cooled by oil splash and the more you take out the
more you will have to find ways to lube and cool them, such as piston
pins, lifters and valve springs.

One of the causes of high oil temps is the oil systems scavenging or
in a wet sump oil levels that are too high or pans that have poor oil
control. But so are bad bearings, improper clearances, incorrect oil
for the application among others.

Synthetic oil has a lot to offer as well as long as the cost is not a
problem, generally speaking though the cost of the oil is usually the
cheapest part of the engine.

Dave Dahlgren

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