So explain how H injection doesn't work again?

[GasSavers_RoadWarrior]

Steam Age PWM ...

Take 4 inches of broomhandle, take a 12V dc motor, drill broomhandle for motor shaft, cut equilateral triangle about 3.5 high, by 3.5 base out of copper foil, wrap round broomhandle, make two wipers/brushes, position one at the point where there is 100% copper wrap of the broomhandle, make a sliding shaft for the other so you can vary it's position... with the motor powered, you now have a pulse width modulator variable from 0-100% duty cycle...

However, a sophisticated HHO setup should not need a PWM... my HHO concept is getting wayyy too sophisticated... I may just kludge and bandaid it together to experiment with like everyone else. I would like to have the cell held at constant temperature by the engine coolant. With automatic water top-up (Constant electrolyte concentration) it should require a constant voltage at constant current... no thermal run-away, plus it scavenges engine heat as a proportion of the energy required to operate, instead of the hit or miss environmental heat scavenging according to ambient temperature. (I think it's something like 20% of the energy comes from ambient heat at room temperatures, but you can push that to something like 60% if you couple it to coolant heat. Cell boil over should be avoided by i) never overvolting it, because you don't need extra volts to get it going cold, ii) high electrolyte concentration.. pushes BP up to 240F or so... iii) coolant coupling should also cool the cell if it started making excess heat above about 210F... so you're operating in a constant range of 195-210 ish.