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Dan Olsen,

This is what I did to provide air to the  oil cooler on my L320.  Take the
NACA duct layout from page 416, Figure 353 and scale it up to 2 times the
size shown.  Cut this opening in the lower left side of the bottom cowling.
Position the NACA duct and the oil cooler on the firewall so that a short
fiberglass duct can be constructed between the two with slip joint for cowl
removal.  This is the air inlet for the oil cooler.
The exit air from the oil cooler is directed downward toward the top of the
exhaust pipes by a fiberglass shroud that is attached to the oil cooler.  I
believe this helps to keep hot air away from fuel lines, gascolator etc..

I have heard of more builders who have had problems with CHT in flight, so I
would be leery about taking any of the cooling air from the top plenum.  My
oil cooler arrangement has worked well for me, even on very hot (100F) days.
Be sure to get a 9 vane cooler.

Bob Jude
N65BJ



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