[–] chaimanmeow 5y ago ↗ while looking at that came across this, which seems like the way to do it. steam for an added efficiency stroke:https://en.wikipedia.org/wiki/Six-stroke_engine#M4+2
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[ 7.4 ms ] story [ 28.7 ms ] threadhttps://en.wikipedia.org/wiki/Six-stroke_engine#M4+2