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Diamond Aircraft has fiberglass oil cooler diffusers (they call them
"plenums") that they use on their Katanas.  They looked pretty nice at
Oshkosh, where I saw one installed on the Continental engine with FADEC
installed.  I didn't get to see it on the Katana because they had the cowling
on.  It has a round inlet for SCAT tubing, making a 90 degree bend and
transitioning to a rectangular outlet which attaches to the cooler.  It
looked like a lightweight part painted with speckly black paint, like
Zolatone.  Not a prize-winning showplane part, but perfectly serviceable.

Their family of aircraft uses two different oil coolers, the Stewart Warner
10568 (Positech's equivalent is #4212) and the Stewart Warner 10599
(Positech's equivalent is #4215).  The Lancair 320/360 uses the latter (10599
/ 4215).

The Diamond part number for the plenum for the 10599 / 4215 cooler is
22-7923-10-00.  The price is $168.92.  You can order it through Diamond at
(519) 457-4041.  Push "2" to get the parts department.  There is presently a
three-week backlog.

At that price, I'll probably make my own....unless Lancair can cut us a nice
deal....

- Rob Wolf
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Please send your photos and drawings to marvkaye@olsusa.com.
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