Quote: Just curious... Why would any evac system create horsepower? Would it be because the rings seal better? Or the intake? Or is it something else that I'm not seeing or understanding? Help me understand. Thanks,
Crankcase vacuum stabilizes the ringpack and allows a better seal. You should also use a low friction oil control ring and that frees up some more. If the crankcase is pressurized there will be some resistance against the piston bottom as well.
