Algodoo

Engine works this way:
1 Piston hits rod
2 Rod pushes 2 props along with it
3 At top position right activator changes power of thrusters to push the piston
4 2 springs installed inside are pushing it back to it's home position
5 At home position left activator disables thrusters to make piston move on its own
6 GOTO 1

Minimal speed of engine: 15-16 rad/s

It comes with vehicle.
Controls:
A - Stall engine
S - Starter
W - Handbrake
Right - Increase throttle and engage clutch