Bsquared
Well Known Member
I have a stock IO-390 but with the 5" oil cooler duct from the new baffle kit. I did my Phase 1 this past winter in relatively mild Southern California conditions with the OAT generally in the 50 deg range. My Oil temp was always rock solid at 180 deg and never over 190 during steep climbs. A few months ago during the Spring I dropped my airplane off at the paint shop and picked it up last week in the middle of a blazing hot summer heat wave. Today I did a one hour cross country flight and the OAT was 84 Deg at 7500'. I had difficulty keeping the Oil temp below 195 in Cruise or below 205 in a step climb regardless of mixture settings. My question is..... are these normal temps for a low time (40 hour) engine in high OAT/Density altitude conditions? Also, CHTs have remained below 350.