From my reading, you don't need much HHO (aka Browns Gas, Water Gas) to change combustion chamber characteristics. I believe that the current market HAFC (Hydro Assist Fuel Cell, a commercial unit) is currently making somewhere around 60 L/hr @ 15 amps. That is enough Browns Gas for a 3.0L engine. Their unit is not the most efficient either. I'm aiming for roughly half of what they are getting, so 30 L/hr @ 7 amps or less. That should be plenty for my Paseo or Matrix. Anything over and above the amount of Browns Gas needed to change combustion characteristics is simply used as fuel and will decrease efficiency.
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