I have two hydrogen generators and have done some testing. Using an inefficient generator drawing 60 amps from a second 12v battery (not connected to the engine) I was unable to make a difference to an idling engine. The engine was a SOHC 2L carburettor equipped mazda B2000 engine.
However my delivery method was flawed (hose into the top of the carby) and I had no guarantee that the hydrogen was actually going into the engine (the hose was not under vacuum). I'm going to try my test again using a vacuum port to guarantee the gas gets to the engine. I'm also going to use the more efficient generator at a higher electroyte concentration to hopefully get more gas output without melting wires or generating steam...
Watch this space I suppose...
*edit: the engine was also badly tuned at the time. not so now
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