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I don't think you'd ever want nearly that much water injected into the engine. In fact, I don't think you want to inject much at all. If the point is to create steam from the water so the expansion of the steam aids in powering the engine, you want to inject already hot water (easy enough, just use coolant to heat). But, you don't want to inject a ton because the phase change takes quite a bit of heat energy to complete. You might end up just cooling down the combustion, not turning much water to steam, and thus loosing power and decreasing efficiency.
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i certainly wouldn't want to get a whole lot of water in the intake, i'd prefer something comparable with what it would get driving in rainy conditions with loads of spray.
my dad once experimented with steam when he was young by trying to boil water using exhaust heat. unfortunately, they never got enough heat to get propper steam.
i'm thinking about routing a pipe to my airbox trough my wai and poking an injection needle trough the air filter, on the other hand perhaps connect this pipe to the top of an air reservoir and have the reservoir such in air trough a submerged bubbler. this way it would such up suspended air bubbles wich would than pass trough a warm duct and be sucked up above the air filter where i imagine is more low pressure than below it.
but perhaps if u use a bubbler i need a bigger intake than a syringe needle?