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Originally Posted by t vago
Water is hydrogen and oxygen.
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It is a chemical combination of both, but it isn't either.
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And until I see actual studies that show that HHO really is better than traditional water injection at promoting combustion inside the combustion chamber, I'm going to continue to maintain that the HHO mechanism is just a dangerous and inefficient form of water injection.
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It's inefficient because of the way the hydrogen is being generated, but it has advantages over injecting water in that the hydrogen can be combusted whereas the water cannot be.
Gasoline and diesel are harder to get burning, and because of their chemical complexity, are harder to burn completely, especially at high flow rates / high rpm. That's why you get more black soot out of a diesel at high load - more fuel is being added, but it can't get burned completely.
The gains of adding LPG, CNG to diesel or H2 to gasoline engines, is that like water they reduce combustion temperatures (good for reducing NOx), but unlike water they also replace part of the chemically complex liquid fuel by something that burns more easily. This in turn helps the combustion of the reduced amount of gas or diesel, which becomes more efficient, leading to less emissions - beyond what is achieved by substituting the simple additional fuel.
The idea of mixing in an easily combustable gas definitely has merit.
The way the H2 is generated, less so.