PSTN is still bugged, but here is the concept

you sorta fixed it, you fixed the stickyness, but its not an engine anymore

but it doesnt have a compression stroke like in a 2 stroke, thats the problem, and its exuast pipe is the whole compression chamber

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Update! moved some things around inside the engine, and added a cooling system

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VERSION .04, i added a solar power cell, it uses my unlimited energy battery as the source for electricity, and some user freindly buttons and lights