[Tim Walsh]

I had to peice it together myself and it sounds like he's using a conventional 4 stroke motor, but then between the exhaust stroke and the intake stroke, just using a desiel injector to inject water to convert the latent heat in the combustion chamber to convert the water to steam creating 2 power strokes out of 3 revolutions of the crank rather than 1 power stroke from 2 revolutions. Interesting idea, I'll bet it works pretty well.