Quote:
Originally Posted by Bowler807
Supposedly during ignition the water flashes to steam and it increases the pressure to drive the piston down. Alcohol and/or methanol simply cool the intake charge.
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I've used water to clean out my combustion chambers before, by sucking it in through a manifold vacuum hose.
It kept the engine clean, smoothed my idle down a tad and quieted the engine as well. My engine felt more powerful, which for some cars could feel like a performance gain. That's my only idea as to how it could claim an HP increase.
With water or steam in the combustion chamber it displaces area for air to fill. It ups the compression but reduces the intake charge. Like Atomic said.
Now the amount of water is barely a mist, i imagine. This won't displace a whole lot of space but will still be there. I'd be extremely worried of what would happen if the engine misfired on a certain cylinder. It might fill up with water and get in the oil pan or might hydrolock it. Worst case scenario but still a worry of mine.