Posted for a flyer <aflyer@direcway.com>:

Rob, how about trying a bigger oil cooler? I used  a SW 8432R on my RV8. I
have an O-360 souped up by Lycon to 223 HP, and never see temps above 180
degrees flying in the southwest. It is mounted on the rear engine baffle the
same as yours (plenum system). The larger pan will just mean it takes a
little longer to get to the same temperature.

The Pacific Oil Cooler site ( http:// www.oilcoolers.com ) has heat transfer curves for many of the popular oil coolers.

John Huft, RV8, 110 hrs.
Pagosa Springs, CO