After finding out that magnets are endless power source (example:
http://www.sparkworkz.com/fc2/index.php?designId=50886) I started thinking how good they could actually be in a game with no real friction.
Well here's what I came up with:
http://www.sparkworkz.com/fc2/?designId=52070Even though i tried to make it as symmetric as i could, eventually at time 3100 the speed gets too fast, the parts get jammed and the whole thing blows up

. Compared to the car engine, they are like nothing.
You can add third circle too, but the part limit gets too close (takes more than 142 pieces) :
http://www.sparkworkz.com/fc2/index.php?designId=52041That red ball has been added to slow down the speed a little.
Please feel free to comment this invention
