Indeed it would be so much better if it had real valves and an exhaust feature and so on, but its really difficult to make! might be trying to do something alittle more "real" later on
What Algodoo version do you have? So what would you call it? I do know how a 2 stroke works and they do not have an power stroke in bottom dead end. Since it has two complete power/exhaust strokes per revolution that makes it an 1 stroke engine if you think about it =)
@Gear97: Well this pump would'nt work at all without the collidewater changer Thanks for telling me you liked it, ive had hours of fun with i myself actually
@PooPingDung: Yeah it´s very much fun for beeing something that simple