Nice Scene man. Uploaded, but got bored so I started modifying it. Not much has changed but its pretty cool now. You mind if I re-upload once its all done up and give you credit?
Aha, yeah, it only self times when its running free. I might just let them run until I like the positions of the piston, and then join them with a conecting rod or two. My single cylinder version is powerfull enough when placed on a square that doesnt collide with anything, to move its self. Thanks for the comments though, its really helpfull!