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Old 08-09-2008, 06:04 PM
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Rzeppa Rzeppa is offline
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Location: Kittredge CO, USA
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IIRC, race cars use methanol, not EtOH. But it's the same thought. Most xtOHs are lighter than water and thus float on water. Higher vapor pressure, lower flash point. And unlike "normal" hydrocarbons, they are very hygroscopic. Gasoline is primarily Heptane (7 carbons), with some octane (8 carbons) thrown in. EtOH is of course, 2 carbons with the OH thrown in at the end. Lower molecular weight, less efficiency per volume. That's why diesel is more efficient than gasoline - more carbons, higher molecular weight.
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