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Old 02-08-2010, 06:30 PM   #45 (permalink)
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According to Fuels and Chemicals - Auto Ignition Temperatures, Hydrogen has an autoignition temperature of 932degF (500degC), while the autoignition temperature of any grade of fuel oils is much, much lower.

I don't think autoignition will be too much of a problem in most diesel engines, though some can reach 1,000+* under fluid compression, I hear.
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