Algodoo

Very nice engine!

I think there is room for improvement though. The max rpm of the engine is hold back by the flywheel hinge. If you go into the scripting menu of the hinge and set legacyMode = 0, the engine can rev much higher. But this will screw up the pistons so it'll need some coding to change the timeToLive of the spawning circles. You might want to let it adjust itself when the engine revs higher. Something like timeToLive = x (-enginerpm / x) might work.