Diesel combat is still alive and kicking here on the West Coast. Go to this page and you can read more about it....
http://www3.bc.sympatico.ca/dieselco...age_diesel.htm
In fact there's a rare photo of me holding a couple of my planes. In the second pic on the page I'm the one kneeling on the right side holding the blue and yellow models.
I haven't done any for about 3 years now since I just plain got tired of fixing the darn things all the time but it sure is a lot of fun.
Diesels are a lot of fun to run if you have not done it before. But your flying clothes will stink something fierce! You also need to be sure to have fresh fuel as the ether will evaporate right through a metal container given time. Don't even THINK about storeing deisel fuel in a plastic bottle for more than a few days. In metal it's good for a season... or most of it at least....
Frankly there's enough proper deisels that I would not bother with conversions. Eric Clutton has the PAW line and maybe some others.
And if anyone is interested I've got a couple of the Chinese Seagull 15's that I'll part with. They are a nice little sport or trainer engine but don't have gobs of power. They start easilyand run consistently though. Would do nicely in a 36 to 40 inch span profile or very light built up stunter or just a lightweight (14 oz total) combat wing for sport flying. They don't come with any sort of muffler as they use the typical British style 4 exhaust ports in a ring around the raised cylinder liner.