Joseph M Berki wrote:

Has anyone used an aircraft oil cooler like a unit from a IO 540 to

cool a

13B? I know the Mazda unit works but it's form does not really fit some
installations.  Thanks for any help.

Joe Berki
Limo EZ

I know where you are coming from Joe. I've had about 10 different
ducting mods to my oil cooler installation, trying to fit that crazy
thing into a LEZ. I've finally hit upon the most elegant solution, and I
am finally done with that thing. But if anyone comes up with a more
favorable form factor that works I am all ears.

--
Perry Mick
Custom Composite Props
mick@bridgingworlds.com
http://www.ductedfan.com

Joseph M Berki wrote:

Recently, I witnessed my friend's Cozy MK IV with a 180 hp Lycoming
complete first flight.  We looked at a lot of things to insure that
everything is functioning perfectly.  This included oil temperature which
was on the money if not a little cool.  The installation was a simple
aviation cooler per plans.  The cowl was pressurized via a large NACA inlet
and the cooler provides a way for the air to get out.  Here was a 180 hp
engine with 1/3 of it's heat load being dissipated by this miniature oil
cooler.  Gee, the rotary should make 180 hp and 1/3 of the heat goes
through the oil.  What am I missing? Thanks for any help.

Joe Berki
Limo EZ-- 

I don't think you are missing anything Joe except perhaps the overall
percentage of heat going to cool the rotary.
Here are the heat balances on a Continental liquid cooled engine, a Merlin
and a rotary. I don't have it for a Lycoming.

Usually the oil temp comes down when you get the liquid cooling right.
Another factor is the sheer volume of oil in an aircraft engine.
My 230 HP Continental O-470 holds 12 quarts. It takes time to heat 12 quarts of oil.

Another factor is the large amount of aluminum surface area in the crankcase
and oil pan that is exposed to the hot oil in a air cooled engine compared
to the small surface area of a rotary.

Also what was the ambient temperature on test day?

Paul Lamar


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