Hey, are there any .30 class 4-stroke heli engines out there?

Thanks -Matt

From everything I have read on 4 strokes you wouldn't want one in a heli. You can't keep them cool enough. The one that was on the market seems to be gone now. There was someone who put a 4 stroke in a Raptor but gave up on it. His main problem other than heat was that the engine wouldn't idle right in the heli orientation. It worked fine if he was inverted though......