Here is Perry's new oil cooler duct.
Did you seal the core in this thing Perry?

No, the hop around the pattern was just like you saw it.
There are air leaks between the oil cooler and the duct.
And big gaps between the cowl and the oil cooler duct.
So a lot of work and experimentation to go.

I forgot to take a picture of the outlet duct.
What does it look like?

There is no outlet duct on the oil cooler.  Just the hole
in the cowl at the rear in front of the big fan.
Amazingly on the ground I was feeling suction at the
oil cooler duct inlet, despite those huge leaks in the
cowl.  Just sealing the cowl will help.

If after sealing it still runs hot I'm going to try my
other '82 oil cooler and then the '86 if the plumbing
changes don't prohibit it.

--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

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