Originally posted by Z:

I reckon a 20mm restricted, <610cc engine could get close to 90kW (at the crank, no accessories, etc.). But as before, I reckon that would be a pointless exercise in FSAE.

(Note that said engine, probably a single with big plenum and bespoke turbo, would have to have all bearing sizes minimised, oil/water pump flows minimised, 2-ring piston(s) with tiny skirts, gear drive to cams (?), CR on the edge of detonation, DLC everywhere, and quite a few other things. But the biggest influence on max power would be the fuel. Ie., use the one with highest energy release for a given amount of air breathed.)

Z
Keep back pedaling. "reckon"? C'mon Z you preach more then anyone that we should know our shit before coming out and making a statement.

As for 90kw, Nobody in FSAE will ever see 90kW unless there engines are pushing over 40% efficiency and .9 Discharge co-efficient throughout the intake and a god of an engine map etc.

Anyone claiming more then 85-ishhp is obviously using smaller ponies most likely shetlans.

I'm expecting someone from Swinny or Stuttgart to chime in about now.