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Registered
Join Date: Mar 2003
Location: SW Cheese Country
Posts: 13,629
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Quote:
Originally Posted by sammyg2
Ah the good old days of 6 mpg.
Stoichiometric ratio for gasoline is 14.7 to one.
IOW, 14.7 pounds of air for every pound of fuel used.
Shoich ratio for E85 is 9.8526
That means you have to dump in a helluva lot more fuel per cubic inch displacement. Turbo or supercharge and that radically increases the need for extra fuel.
Ethanol resists autoignition and deiseling so you can run a higher effective compression ratio. That increases torque which increases horsepower.
But you gotta dump in as whole lot more fuel to do it.
a 20% increase in power isn't very economical if you have to burn twice the volume of fuel to get it.
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It also tends too cool the combustion chamber when injected batter than gasoline.
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Brent
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