Smokey Yunick hot vapor engine
Google this: What Ever Happened To Smokey's Hot-Vapor Engine? - Hot Rod Network
You might need to re-build your internals to handle the compression and heat - the ideal piston/cylinder head, cylinder liner would be nodular iron for ultra low heat transfer, although you might be able to get away with just a ceramic coating on the piston head and cylinder head - you would want to use a bowl shaped piston head like in modern direct injection diesel engines in order to contain as much heat inside the combustion chamber as possible, and you might need to use Total Seal compression rings to contain the increased pressure without having ring blowby.
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