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Message: <blockquote data-quote="jswong" data-source="post: 3612513" data-attributes="member: 8004">Don't confuse hydrogen hybrids with those hydrogen fuel-saving devices. Hydrogen hybrids use hydrogen gas (not HHO) through another device to produce electricity, e.g. like methanol fuel cells. It's a chemical reaction to produce electricity. When running with hydrogen fuel, hydrogen hybrids use the generated electricity to power electric motors.It is totally, totally different from HHO devices.Furthermore, why do some vehicles run fine with HHO gas and others don't? The reason is because for HHO gas to enrich the fuel-air charge so that less fuel is required, the car needs to know that the mixture is now richer due to the presence of HHO, and deliver less fuel so that the effective air-fuel ratio remains around the same.If you have an open-loop ECU, it's not likely this will work because the ECU doesn't monitor the AFR of the burnt mixture.If you have a carb, perhaps you'll have to adjust the jetting of both the carb and the HHO generator, but that'll mean that your engine will be running way too lean once water runs out, so you can't really run dual-fuel.If you have a closed-loop ECU, there's a possibility that it'll work but the combustion of hydrogen within a steel or cast iron engine block will result in premature fracturing due to hydrogen embrittlement.This is the primary reason why car manufacturers don't use it as a standard device, because prolonged combustion of hydrogen in a regular internal combustion engine will cause the engine block to crack prematurely due to the reaction between hydrogen and steel.P.S. as for NASA testing such devices, it's normal for NASA to test any power generation system. If, for them, you can provide distilled water to a spacecraft and let the solar cells power the electrolysis process, and then you burn the resultant HHO gas to produce thrust, no doubt this would be a desirable technology for space travel. But guess why it hasn't been deployed to any space probes, and not even to satellites in orbit that get regular amounts of sunlight and only need an occasional jolt of thrust to keep their positions in orbit.</blockquote>