<VV> Test for Oil transferring heat .

[Mark Durham]

John, thanks for your support on the fact that the oil in a corvair
engine Does play a roll in removing heat from the engine. Everyone will
note that water cooled engines do not need oil coolers because the
water cooling system keeps everything in the design temp range for the
engine and oils in use. However, the air cooled engine is different.
The internals would experience over temp because the overall temp of
the air cooled engine is 125 to 150 degrees hotter in normal operation.
So an oil cooler was added to pull the heat out and keep those internal
components in there normal temp range, including the oil. Again, I
refer to my experience on air cooled aviation engines which use larger
oil coolers that are not enclosed in the tin like the Corvair so it has
a continual flow of air, and in 200 hp plus engines, you start to see
spray nozzles that spray the bottom of the cylinder bore and pistons
and rods expressly for cooling purposes. I have seen engines fail
because one of those spray nozzles plugged up. The piston end of the
rod turns blue and the piston pin seizes, then the piston wear
accelerates, not a pretty sight. Mark Durham

Sent from my Windows Phone
From: John Howell
Sent: 2/5/2012 9:18
To: virtualvairs at corvair.org
Subject: <VV> Test for Oil transferring heat .
NOTE:  I don`t think that you will have to be a petroleum engineer to do
this test.

Next time you change the oil in your car warm the engine up good before
you drain the oil.  As soon as you drain the
oil into a catch pan stick your finger into that oil and see if the oil
removed any heat from the engine ! Ha!


John Howell
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