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Hey Gang,
I did a bunch of research a while ago when we were discussing this, and I realize I never posted a follow-up.
I found a lot of stuff on the six cycles as well as a lot of research papers on using water vaporization/expansion to convert heat into usable energy. It seems the true caveat is that water takes longer to do its thing completely, and thus would have to have a much slower compression cycle for the water stroke.
Perhaps some opposed piston design, or cam driven valved expansion chamber would do the trick, but it certainly wouldn't work in a normal combustion setup; I guess that answers the question!
Thanks to all that joined in!
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