We find this article in WikiPedia to be a good start if you are interested in the technical aspect of using hydrogen as a diesel or gasoline fuel supplement:
http://en.wikipedia.org/wiki/Hydrogen_Fuel_Injection
Basically, in a research carried out by NASA’s Lewis Research Center in 1977 on a 1969 Cadillac engine, they found that adding hydrogen as a supplemental fuel would allow the engine to run at a leaner fuel/air condition. Without adding hydrogen, the stoichiometric ratio of gasoline/air is 1 to 14.7 by mass. With hydrogen added, the engine can run at a gasoline/air ratio of 1 to 20 or more, which is impossible without the adding of hydrogen. Leaner ratio means less fuel needed, which is exactly what we want.
If you cannot understand the technical terms, then the following post entry on the chemistry of Brown’s gas (another name for HHO) explains the best in simple-to-understand terms:
http://www.fuel-saver.org/Forum/showthread.php?tid=814&pid=6911#pid6911
More resources will be posted here as we find them.
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