Gday Raymo
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If the water is under fairly high pressure, and at a temp of >400 degrees
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Agreed, but in this case the energy to heat the water and also raise its pressure has to come from the engine itself.
At this scale, the pump required would probably use more energy than you got back, let alone when you factor in all the other thermal losses along the way. Be fun to crunch the numbers reqd, based on only having tiny pistons.
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Some steam recip engines operate at a bit over 1000rpm
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Yep, but i dont know of any designs that would do that based on using an existing cylinder in a std IC engine block.
Andrew