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FJR Motorcycle Forums
FJR Specific Discussion
E15 / Unleaded 88 in 2008 FJR1300
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<blockquote data-quote="RossKean" data-source="post: 1461939" data-attributes="member: 19880"><p>Yes, ethanol absorbs water but the E10 mix will allow water to dissolve completely into the blend until (at equilibrium) water concentration is around 0.4%. (Some references say up to 0.7%.) <u>Until you hit this concentration, there is no separation.</u> 0.4% is around a half ounce of water per US gallon of fuel or over three ounces in a full tank of gas. (Of course, it assumes complete and thorough mixing. Three ounces of water dumped into a tank would go directly to the bottom since it would not have the opportunity to attain equilibrium with the fuel. Mix it long enough and it would eventually dissolve.) </p><p>If you get separation, either the fuel wasn't dry to begin with or you have exposed the fuel to VERY humid air or a LOT of water has condensed into your tank. Unlikely, if you keep the tank full to minimize exchange of air. As mentioned, a small amount of water or water-ethanol mix might burn off OK, although the engine would run a bit rough. A large slug would stall the motor.</p></blockquote><p></p>
[QUOTE="RossKean, post: 1461939, member: 19880"] Yes, ethanol absorbs water but the E10 mix will allow water to dissolve completely into the blend until (at equilibrium) water concentration is around 0.4%. (Some references say up to 0.7%.) [U]Until you hit this concentration, there is no separation.[/U] 0.4% is around a half ounce of water per US gallon of fuel or over three ounces in a full tank of gas. (Of course, it assumes complete and thorough mixing. Three ounces of water dumped into a tank would go directly to the bottom since it would not have the opportunity to attain equilibrium with the fuel. Mix it long enough and it would eventually dissolve.) If you get separation, either the fuel wasn't dry to begin with or you have exposed the fuel to VERY humid air or a LOT of water has condensed into your tank. Unlikely, if you keep the tank full to minimize exchange of air. As mentioned, a small amount of water or water-ethanol mix might burn off OK, although the engine would run a bit rough. A large slug would stall the motor. [/QUOTE]
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FJR Motorcycle Forums
FJR Specific Discussion
E15 / Unleaded 88 in 2008 FJR1300
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