Finger Engine Simulator Fidget

When I saw the topic of engines,I realized that there is no model anywhere, including here in MAKER WORLD, that simulates the mechanics of a real engine. What the heck am I talking about???All internal combustion engines (except rotary engines) have a mechanism that uses the force of the fuel explosion to create reciprocating motion of the piston and convert that force into rotational motion. However, all the 3D printed engine models I've seen reverse this transfer of force, using rotational