Not to get in a messy thread about silly stuff like HHO but for Nerys, if you want a 4% gain with the HHO using a couple of deep cycle batteries why not just ditch the alternator and run the car off the deep cycles? It has been proven to work and get you as much as a 10% gain in mileage. As an added boost you could swap out the alternator to an electric motor and use that to help drive the car directly instead of the indirect and inefficient method of going from electric > HHO > mechanical you could go straight electrical > mechanical with better than 90% efficiency.
I can see people wanting to make this work and I am all for random experimentation for the sake of personal knowledge. But this is no the 19th century and a lot of fields have advanced farther than a backyard tinkerer typically understands so even though the age of backyard discoveries is not totally over they are much harder to pull off now than they have been in the past. So if you have seen someone try and do something and it either didn't work or they never said if it did(probably didn't), try something else and see if you can get it but duplicating a failed experiment and hoping for a different result typically isn't going to get anyone that far.
But to maybe add something beneficial to this thread. How about before making a HHO powered/assisted car someone actually designs an experiment mythbusters style that does away with the engine all together and just combusts some gasoline in a 14.7:1 AFR and measure the energy output. Then add some HHO, H2, or whatever to the mix and see what kind of difference it makes in the energy output as well as analyze the exhaust gasses. Should be a fairly basic experiment and would be easy for others to duplicate and verify. From there the complexity can be increased incrementally until you are up to running your car on it. A basic step in actual scientific experiments is having others duplicate your work to verify it. If anyone working on HHO really wants it to work, repeatability and duplication should be a basic part of your experimenting.
Zombie Feynman says, "'Ideas are tested by experiment.' That is the core of science. Everything else is bookkeeping."
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