Hi,

I have a YS 1.10 with a Hatori pipe mounted in a Swallow pattern plane. I'm running the new low viscosity Coolpower oil 22% with 20% nitro, and a 15x8 APC prop. The ambient temp was about 35 degrees Centigrade.

The engine seems to overheat, both at idle on the ground and in flight. I noticed it losing power on the last flight.

I decided to try to run it without the cowl to see if that improved the problem. The engine then promptly detonated and threw the spinner.


Do I need to strip the engine to check for damage? How would I recognize heat damage? Any idea's for a fix?

Steve