Hoping you hillclimb guys can answer this..
Had a discussion with a friend of mine who reckons rotary engines provide the best power to weight ratio of all naturally aspirated powerplants while Im thinking the 90KG Hayabusa derived Hartley V8 with over 400bhp must be right up there. The amazing DP1 uses this powerplant.. see
http://www.dpcars.net/dp1/index.htm
There must be other engines also, please educate me..
Cheers,