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Excuse me for not reading the entire thread in detail before writing this, but someone mentioned alcohol injection and I recently read an old but rather interesting book about alternative fuels where I found a warning about adding fuels in to the intake air on a diesel engine. In the book they had made tests with propane/LPG and "wood-gas" as the main fuel together while only a small amount of diesel were injected the normal way to act as an ignition fuel. This definitely works and the diesel engine can deliver more power than normal but since all fuel is burnt rapidly the "diesel-knocking" becomes hard, increasing the wear of the engine.
I guess adding methanol can work great as an intercooler but it may also give an uncontrolled and rapid combustion that can damage the engine.
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