Re: ethanol and fuel mileage

Posted by Dr Cy Kosis on October 26, 2003 at 10:29:38 from (65.174.44.162):

In Reply to: ethanol and fuel mileage posted by Terry on October 26, 2003 at 08:35:08:

It takes twice as much ethanol/alcohol to run an engine as it does gasoline. Gas burns at 14 to 1 air fuel ratio while ethanol burns at 7 to 1 in an engine. Until recent years it was uncommon to run ethanol through carburetors because the passage ways in the carb bodies could pass enough fuel throuh them. Over time special alcohol ccompatible carburetors were developed for racing that made it more commmon to run alcohol without the expese of constant flow fuel injection that had been common before. Ethanol/alcohol makes some good horsepower though. It allows a lot of advance and compression without detonation and it has a massive cooling effect on the intake charge during vaporization. Cooler air is denser air, and denser air allows more fuel to be burned, and makes more power.

10% ethanol by calculation would require richening up the fuel mixture enough that it should reduce the fuel mileage by 5%.

I found out years ago that "Gasohol" in air cooled motorcycle engine was a real bad idea unless you fatten it up a few jet sizes.

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