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You mentioned "thermal efficiency", but you forgot the "other side"...

...that I've posted here before, and everyone chooses to ignore. But that's what happens when you base it on "laws of physics", rather than MSM/marketing.

You are absolutely correct regarding thermal efficiency. The other side is that there is a finite amount (Joules) of energy "stored" in a given quantity (gallons or liters) of fuel. Some combustion engines (especially newer ones) are more effective/efficient at capturing that released energy, and converting it to useable hp/torque at the crankshaft.

BUT--and this is the BIG "BUT"--if you want 400 hp at the crank, it requires a certain amount of fuel to be burned to obtain the required amount of energy. Again, engines vary in efficiency at capturing this combustion energy, but the limitation of energy per unit fuel is essentially a constant. There are other factors, such as vehicle weight, internal/external friction and other drivetrain "losses" that come into play, but the bottom-line is XX amount of energy per unit fuel--simple physics. Space-X rockets aren't launching on pump-gas.

But we're not engineering for better fuel-mileage. We're engineering to squeeze 400+hp out of a 2.0L turbo-4, rather than a 5.7L N/A V-8. But you still require a (very) similar amount of fuel to attain that--remember, there's only so much energy per unit fuel.

Using the "tech" we have now, we COULD be building vehicles that easily exceed 100 mpg. They wouldn't have 400+hp, but they'd easily achieve that mileage goal.

But that's not what sells.




"So I talk to the night, I head for the light, try and hold it on the road. Thank God for the man who put
the white lines on the highway"--a very dear friend for decades Michael Stanley (Gee)--RIP


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  • You mentioned "thermal efficiency", but you forgot the "other side"... - dark_dave56 05:24:37 11/26/21 (0)

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