The bloke who built Lycomings did Build cars and REO was Continental.
Car engines for Cars and aircraft engines for Aeroplanes.
Power to weight ratio, Efficiency and reliability is foremost in Aircraft. Racing car engines don't have to be built to last Long . IN the early days some aero engines featured Prominently in land speed record cars like NAPIER and some aero engines ended up in Tanks. RADIALS and Liquid Cooled . A version a the RR Merlin was used in Centurion tanks. Nev