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E85 for 2 strokes

Posted: Mon Jul 06, 2015 2:59 am
by ChrisK
Has anyone done a conversion to run E85 fuel in a 2 stroke carbureted motor? I'm interested in what had to be done jet wise and whether the motor ran perceptibly cooler? If this was in a race situation, so much the better.

Re: E85 for 2 strokes

Posted: Mon Jul 06, 2015 10:18 am
by Barry S.
It would probably destroy the motor in short time.

Re: E85 for 2 strokes

Posted: Mon Jul 06, 2015 10:53 am
by ConnerVT
Bottom of this link discusses E85. -- http://www.klemmvintage.com/gasolines.htm

Re: E85 for 2 strokes

Posted: Tue Jul 07, 2015 6:03 am
by tz375
Methanol for some reason doesn't seem to be as beneficial in 2 strokes as it is in 4 strokes according to racers I know that used it back in the day. On our 4 strokes we had to open up the pilot jet, went with an AMAL Z profile on the needles and used main jets that flow approx 230% of stock.

Ethanol is similar to methanol in terms of needing a much lower A:F and it seems reasonable to expect E85 to need somewhat less in of a change. We could work it out by checking the upper and lower heating values and density of ethanol and methanol and make an educated guess. Get it right and the engine will run cooler than on gas. Err on the rich side and leave it a little rich and you should be OK.