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if you do the math, it takes a LOT of energy to evaporate or boil water to vapor. Way more energy then exists in the air.
I think the secret to this is to look at what happens on the compression stroke - absolute pressure goes from 10psi to 100 psi or something, and all the vapor turns back to liquid, sucking some of the heat up and slowing detonation.
Then, ignition and everything starts burning. As the fuel and air burn, they give off heat. LOTS of heat.
I think if you had SMALL droplets, this heat would turn the liquid water to steam, giving more thrust on the piston, as well as a LOT more controlled pressure.
Further, this would limit the absolute temperature of the burn event, lowering emissions due to the reduction of NOX.
An absolute win win win for lean burn.
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