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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