I've been reading about excessive oil temps, of which, happily, I have none. Oil temp is, at highest 169 degrees, and at cruise steady 143 degrees. But, after 5 hours in my RV9A, we are still experiencing CHT's, with OAT's 16-26 F, @450 at TO for #1, being the highest. At cruise 2100 RPM, we're 370 for #1, the others are lower, but not by alot. We have a rebuilt O-320 B1A with chrome cylinders, conical mount. The prop is a metal Sensenich recommended by Van's (79") pitch. Two IA's have looked at the baffling and didn't find any obvious causes for the high temps. We have RTV'd waste areas and lowered a small amount of the intake dams on both sides of the intake per recommendation of the IA. Seemingly no change. I removed two small fiberglass rectangles from the exit of the lower cowl thinking that that would increase airflow. Still no change. VAN's tech said they have not experienced temps that high. It's built per the plans, no mods. I'm not seeing squawks from any of the 1100 or so 9 builders. Does anyone have a clue here? We're at wits end. EIS with GRT HXr.
Thanks to all.
Thanks to all.