This is one of a couple tantalizing stories I've seen on that site over the years, something that sounds really promising but then leads nowhere, calling the whole story into question. The other one is the lawnmower engine retrofitted with a magnetron in place of the spark plug, turning the engine into a type of steam engine running on water. Poster acted like it was no big deal, and apparently moved on to more interesting things.
Ok, this magnetron-on-lawnmower thing is interesting me. The problem I'm seeing is that unless you run an extension cord to the mower, it's not actually going to do anything. Steam is a useful way to turn pure heat into something that can push a piston, but turning water into steam doesn't actually generate any new power. I think it would be really cool to do... but the end result would surely be no better than simply putting an electric motor into your lawnmower.
Also, this definitely reminds me of all those "free energy/orgone/powah of da pyramids" kind of things that people without a decent physics education get suckered into. Run your car on water!
