From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] Oil cooling
To: lml
Date: Thu, 02 Jan 2003 22:25:09 -0500
Message-ID: <web-1944157@logan.com>
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Posted for "Dave O'Donnell" <daveodonnell@direcway.com>:

I don't know the answer, but have some ideas about how you could figure
it out;

Measure oil cooler exit-air temperature and ideally the exit-oil
temperature.  Question; Your "oil temperature" is being measured were?
I believe it is customary to measure "oil temp" on the cooler outlet
side (cold).  If the exit-air temp is near the exit-oil temp then you
are getting the energy into the air, you just need more air volume to
cool oil further (work on the inlet, try and create lower pressure on
the exhaust side, etc).  I believe you suspect this as the problem now.
You could then measure cooler air inlet and exhaust side pressures
relative to each other and relative to static to get clues were to work.
If there is a large air pressure drop across the exchanger (inlet to
outlet) then the exchanger is an air bottleneck.  An exchanger with a
bigger air cross section could help move more air through.  

If the cooler exit-air temp is significantly less than the exit-oil temp
then heat energy is not transferring to the air.  This would mean you
need a bigger more efficient air side exchanger (larger deeper (relative
to air flow) exchanger).

Maybe someone who has been through this directly will speak up and give
you the answer straight away.  You might ask the cooler companies
directly what exchanger size they would suggest for your engine.  They
should have some guidelines / rules of thumb.  

Best regards,

Dave O

>>>I am having problems getting my oil temperatures below 200 degrees with
outside temperatures at or around the 32degree level.  Most of the time
I am running at 220 to 230 degrees.<<<