I read an article about something similar... let me see if I can find it...
here it is
But it looks like with this they are just using electricity to split the H2O, and the Al to remove the O.
Anyway cool stuff, thanks for posting that. I've also read that HHO can be made from steam (with a fancy platinum thing) with high ef. If I had lost of money, time and a machine shop I'd be playing around with that right now
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