Does ethanol burn hotter than gasoline and what are the engine design concerns?
Answer:
Ethanol doesn't have the power of gasoline all so takes more energy to make ethanol then it will produce.
Here is a link to how to convert over a engine to get the most power.
Ethanol does not have the BTU rating that gasoline has. It takes about 20% more Ethanol to equal the energy of gasoline. Ethanol does, however, burn cooler, actually, than gasoline. The octane rating for Ethanol is about 100, or better. which means that it burns for a longer period of time, and delivers more of it's energy to the engine. The reason that an engine "seems" to get hotter burning such high octane fuel is that the burn time is longer with such fuels as alcohol as opposed to gasoline, so the engine tends to retain more heat than with a lower octane fuel.
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