Ben Baltrusaitis wrote:

Paul and everyone,
I need some help with cooling a Kitfox 5 with an EJ-22 Subaru. I bought this plane so I have something to fly while my Acroduster Too w/20B is under construction.
My problem is that on climbout it is running hot. (Cruise is no problem.)This is due to the fact that the air is flowing over the muffler and then through the radiator.
I need a simple cheap fix. I would rather not redo the whole cowl and radiator position as I will probably sell this plane after my Acroduster is flying. However, if I must I will.
I have thought about ducting the muffler to dump air in front of the radiator, keeping the flow out of the radiator. I don't know if that will destroy the air flowing from radiator exit.
Another problem area, there is also little clearance under the radiator for a good flow out. I know from your recommendations that the clearance is tight. If you tell me I must move the radiator, I
will, but would rather not. I think this engine could be cooled with a smaller radiator if it was properly setup. The radiator size was doubled after it was test flown.
Thanks! Your ideas will be most appreciated!
Ben
(Short for Benedict)

Yep! sSre is in a bad place. You might try a sheet metal wedge shaped diffuser and
come in to the right top end of the rad and up to the right cowl scoop with a six
inch SCAT hose. The sheet metal wedge should shield it from the radiant heat from
the muffler. Seal the duct perfectly.

Paul Lamar
 
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