Algodoo

You don't have to use lasers! Just make the piston collide with the spawner and it will work. Just make sure that the balls you spawn don't collide with the spawner

For example your piston can be collision layer E and F; the spawner is collision layer F, and the spawned balls are collision layer E and D (D is to kill them with a killer later, don't use timeToLive)

I've done that and i'm getting 700 RPM out of your engine and the wheel slips uncontrollably

Wow I don't know why I didn't try that, I made the small pistons collide to the spawner, works really well, thanks