I have been running a TH .75 for about 2 years now and it hasn't given me much more than a headache! I have it now installed in a BH Matrix but everytime I run it for over 3 minutes, it shuts down. Both times I've been able to get it back okay, with only the first deadstick ripping out the right wheel pant and axle.

I am running it at 11k with an APC 12x7 prop. When I tested on the ground, it also would run about 2 minutes sounding healthy and then aferward it would loose some power.

I guess it may be overheating but I don't think I have too few holes. I mean some of the engines run purely in cowl. Right now I have maybe a 1 in to .7 out.. Could this not be enough?