rahmu wroteWhich kinda raises a cool question: Do we have any mechanical expert here on LebGeeks? Maybe someone who knows how to build an engine?
Well arithma is a mechatronics major, which is sort of a hybrid combination of mechanical and electrical expert. Besides, differential gears are taught to all engineers these days (except maybe civil and telecom engineers). They're a key ingredient in system designs.
I built with MrClass a plastic, operational model of a gas engine when I was like 11 (still have it, with spark plugs, pistons, crankshaft, timing gear and wheel, the whole deal):
This was about the same time we took about building gas engines in technology class at school. Not everything moves, just the pistons and timing belt, and the spark plugs turn on and off. However, the operation process highly resembles the real engine. But this is my limited experience in building an engine.