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Seems feasible. The outside piston would seal just like any other, the combustion "chamber" is between the 2 pistons. Wrist pin strength would be fine because there's a rod on either side of the piston, instead of inside, so no cantilevered load. The second piston is needed to uncover the exhaust (intake?) port, and help pump the gasses. I assume the outside rods would be enclosed in the crankcase.
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