Actually, if you just mix ethanol with gasoline, the vapor pressure will go up (not like salt in water). To compensate, the refiners formulate the gasoline that is going to be mixed with ethanol to have a ‘lower’ vapor pressure (volatility) so that when the ethanol is added the vapor pressure is then in the right range.

 

Bill Schertz
KIS Cruiser #4045
N343BS
Phase one testing Completed

It raises the boiling point in the same way salt does to water... and is proportional to the mixture ratios..

Dave

On 9/2/2011 2:04 AM, Steven W. Boese wrote:

 

The higher temperature tolerance of the auto fuel with ethanol compared to the auto fuel without ethanol was surprising to me.

 

But I only collect data --- it is up to an engineer to make sense of it ;>)

 

Steve Boese

RV6A, 1986 13B NA, RD1A, EC2

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