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I have had this debate a number of times about the equipment that you install on your car to split the water into hydrogen and oxygen. Obviously the amount of energy required to split the water is far greater than what you would get back from burning the hydrogen and oxigen again (you always have a loss) I think these systems dump the oxygen too which is even worse. Anyway that's my arguement on it (and I think it's where WhiteD3 is coming from too).
A common reply to this is that you are not depending on the hydrogen to give you more power from its combustion but the fact that a small amount of hydrogen being present in the combustion chamber results in a more efficient burn of the fuel. Apparently there is some truth to this but there was a reason (which I can't remember right now) for that not even to be viable (I think it's that you need a lot more hydrogen to get the effect than what is typcially introduced by these kits or something like that)
The arguement for what I have just said above is that if you use such a system on an engine with computer controlled fuel delivery, that the hydrogen changes the relative quantities of the different gases in your exhaust and fool exhaust sensors which results in a correction by the fuel delivery system (I think by running a little leaner but not sure).
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