I know this is relatively old news, but the Continental diesels bear some attention. On a 172 they slightly underperform an O-360 up to 2000 ft.ASL , at which point the performance curves cross over, with the diesel maintaining full power to a much higher altitude. My son is currently setting up a shop which will, among other things, be a certified service centre for these engines, and he was very excited about them after attending their factory training in Mobile. They also have a much bigger, horizontally opposed 300 hp diesel coming out right away that would be an awesome power plant in a 10. Significantly lower fuel consumption than their avgas alternatives, of course. Worth a look!
Moose Jaw Saskatchewan
RV6A "Second Wind" C-GERZ (born N242UL)
O-360 A1A, Sensenich FP prop
Those who think any system is foolproof greatly underestimate the ingenuity of fools