Geniuses like Nikolaus Otto and Rudolf Diesel came up with the bases of internal combustion and industrialists like Soichiro Honda built whole companies on brilliant engine designs. Still, it's these ten engineers who got the closest to engine perfection.
10.) Felix Wankel
Felix Wankel might have been a nazi nutjob while his engines are unreliable oil-burners that bankrupt NSU and pushed AMC towards a slow death with the Pacer, but who cares? Jesus loves rotaries certainly doesn't: