>First off, thanks for the educational responses. I love threads like these. This is what the internet is great for. Agreed. I wish there was more discussion like this on Poal. It would make this site even better if we could have serious discussions rather than endless shitposts. Anyway, I don't think using ultrasonic vibration would help any in the electrolytic process to generate HHO. The mechanical energy wouldn't add anything significant to the process aside from helping to degas the water which could make harvesting the HHO better, but not by much. The addition of other ions to the water, such as salt, does greatly improve electrolysis by making the water more conductive, but now you have to deal with chlorine gas being part of your recovered HHO. Probably not what you want to have in your welding gas mix. I have seen some promising experimentation with pulsed and high frequency electric current used in electrolysis that does appear to improve the efficiency of the process. I remember seeing a video of a guy getting good results with a setup where he was able to create more HHO using a function generator to pulse the input power to his generation cell with a specifically shaped waveform at a couple of kilohertz. He was also using palladium electrodes and platinum-on-carbon coatings to greatly increase the electrode surface area which also improved the process. He was getting good output but it's hard to say if it was the electrodes or the pulsed energy that was improving the process. He didn't have any appreciable data at the time I saw it to back up his work, but it's been some years since I saw that video and he might have some better results now along with the data to back it up. If we can get HHO production by electrolysis to a viable point, then water engines could become viable. I still think it is better to use the H2 and O2 to power a fuel cell rather than direct combustion for powering vehicles, but that's a very debatable subject. Hydrogen burns too hot in a pure oxygen environment for me to consider it a good candidate for direct combustion engines. The engine parts would become more exotic to deal with the heat and take away much of the benefit of the concept. Fuel cells allow for more flexibility in that they can be used with existing electric motor technology that has already improved greatly and would not require managing the high heat of combustion. Of course fuel cells bring their own danger in needed to store compressed H2 and O2 gases which makes vehicle use quite dangerous should a collision occur. There's no perfect answer, but at least we have options. It's hard to be gasoline for energy density, safety and ease of use though so the future will still see gasoline engines continue to reign supreme for years to come.