Quote:
Originally Posted by Old Mechanic
Peak BSFC is more power than the car will use at any normal cruising speed. To reach peak BSFC you would have to reduce the engine size to the point where maximum power would be insufficient for climbing grades and other high sustained load situations.
regards
Mech
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If you reduced the engine size that far, you would need to regularly run WOT up to redline RPM to climb hills and accelerate. BSFC drops at high RPM because of engine friction. The best overall compromise is an engine sized so that most driving is below best BSFC RPM.