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<p>Thanks Paul and others. That is basically what I was looking for; especially your information that if the temperature of super heated steam is high enough, it will liberate the oxygen and hydrogen. Here is the inspiration for my question: Recently BMW has announced a prototype for a new type of hybrid vehicle powered by an internal combustion engine that makes steam through an exhaust heat exchanger, and then uses the steam to power a steam engine, which contributes to the propulsion of the vehicle. </p><p><a href="http://editorial.autos.msn.com/article.aspx?cp-documentid=434462">http://editorial.autos.msn.com/article.aspx?cp-documentid=434462</a></p><p>Reclaiming waste heat from the exhaust sounds like a good idea, but adding a whole second engine just to utilize that waste heat seems a bit much. It sounds like they actually added two steam engines for the power reclamation, with the second being smaller than the first.</p><p>I was just wondering what effect could be had by making superheated steam with the exhaust heat and then injecting it back into the combustion chambers of the engine that made the exhaust heat in the first place. Certainly it would put heat energy back into the combustion chambers and may reclaim power by doing so. But what if the steam were superheated enough to liberate the hydrogen and oxygen? Could this become fuel to supplement the galsoline or diesel fuel that the engine runs on to begin with? </p>
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