Quote:
Originally Posted by Old Mechanic
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Lets look at it another way, bsfc for most small passenger car diesels are right at 200 or just slightly lower in their sweet spot (generally speaking). For gas engines it's right at 250 (also generally speaking). Take 200 and divide that by .88 and you get 227.2, round that off to 227 and you have more than 50% of the difference due to the energy content of the fuel.
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sorry dude, but bsfc is by weight (grams), not volume, and gas and diesel are about the same in the weight department (gas is actually a little higher)
http://upload.wikimedia.org/wikipedi...gy_density.svg
I think UFO explained the effects of increased compression ratio pretty well, higher expansion ratio=more energy extracted.