Well I think we've got it licked! When I went to put the oil thermostat back
into the oil cooler I discovered that I had put it in backwards when I was
checking it out after my engine rebuild. So I checked it out once again and
put it back in right-way-round. I also switched the hoses around so the "In"
hose went into the "In" port on the oil cooler (which happens to be the
lowest hole on oil cooler the way I have it installed).

I warmed the engine up well and felt the oil cooler and, OUCH! - it was
quite warm at both ends. There were no leaks and nothing looked like it was
going to fall off so I took it up for the real test. Climbing out oil and
water were 180F and that's where they stayed all through the climb. When I
leveled out and ran at full throttle (5300RPM for me) for 30 minutes oil
dropped to 165F and water was 180F (that must be where the thermostat is
set).

So, thanx for all the encouragement and words of wisdom. Now I just need a
good hot day to really try it out. It was a blazing 74F at ground level and
54F at 3000ft so not much of a challenge compared to Florida's 90F days. We
usually get a 90F day or two in August!

Thanx,
Joe Hull
Cozy Mk-IV #991 (In Phase1 Flight Test - 33.0 hrs flown)
Redmond (Seattle), Washington