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Science is iterative
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this post was submitted on 05 May 2026
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I'm aware of some large ships that do that, using either a sterling engine or maybe even a steam engine to put waste engine heat to use.
I have heard of a 6-stroke engine. The idea is, intake compression power exhaust steam exhaust. The four strokes of the Otto or Diesel cycle happen, and then hot high pressure water is injected directly into the cylinder which flashes to steam and expands, pushing the piston, and then another exhaust stroke lets it out. This puts much of the waste heat out through the crankshaft rather than wasting it via radiator. It's not without its problems though.