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Originally Posted by teoman
Just read that the new gasoline engines are supposedly compatible with E85, which has corrosive water and alcohol inside.
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Most of the fuel injection hardware nowadays are compatible to E85, and the ethanol is actually more corrosive than water. Anyway, since in my country we use hydrated ethanol at a concentration of 96% by volume with the other 4% being mostly water, and that an ethanol-capable engine can still operate at a concentration of 80% ethanol by volume with the other 20% being water (seems inviting to run on homebrewed vodka not standardized to 40% alcoholic volume), it sounds like using hardware from a fuel system for the water spraying device won't get you in trouble as long as you avoid using tap water. Distilled water prevents electrolythic corrosion of the metal parts.
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What water soluble oil/lubricant would not upset a diesel engine?
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Alcohols, either ethanol or methanol, can be used to emulsify some lube oils and the water. Those castor-based oils used for competition 2-stroke engines are more likely to work since they're easily soluble on alcohols.