Algodoo

This is my latest engine. It is technically a 1-stroke, and it could be considered a turbo spawn engine because the killer that destroys the spawned circles also attracts them. Not much new with this engine except that by using the autobend feature and changing the bend target of the cam shaft, you can change the timing with the press of a key, and therefore change the direction the engine runs in. The car is connected to a large mass to show its power. The graph shows the potential gravitational energy of the car and the large weight, and so you can see how much energy it puts out. It can put out around 40-50 megawatts, which is around 50,000 hp.
Controls are:
Engine on/off: Enter key (toggled)
Start: Shift key (you only need to press briefly)
Clutch: Up arrow (toggled)
The left and right arrow keys change the direction the engine runs in. If you want to change direction, then shut the engine off, press the direction you want to go in, and then restart the engine. If you change direction while moving you will get a whole bunch of spawned circles flying out of the engine.