There was another guy who invented a motor that used a hybrid system.

I'm not technically capable as of yet but im working on it.

Basically you run a standard piston style motor but combust the hydroxy mix. As the piston comes down it injects water vapor at the right moment.

This causes superheated steam and gives more power in your stroke, than the hydroxy alone, plus you need less of it. It makes on demand production workable.