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Originally Posted by Evil Result
A question i have although off topic is.... fuel effiency, what would have better fuel effiency based on equal horsepower outputs say 500hp, using the same mechanical design. This means same fuel delivery, ignition, cam system, induction, exhaust, ect, ect. Just a difference between revs and displacement, which would be more efficent, higher displacement lower reving engine, or a lower displacement higher reving engine?
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I gather that what you're saying is that you want to know, for a given BMEP and power output, whether a low-rev engine or high-rev engine of the same general layout would be more efficient. I'd have to say that the low-rev engine would be, primarily due to the reduced friction losses (and probably reduced pumping losses too, but I'm a bit out on a limb here - no time to check).