so i am working on building a traction engine if you do not know what that is look it up.
and was wondering if you guys have any suggestions on how to make it piston powered or stuff like that right now i have a pretty good looking one unreleased that has a decorative piston engine that works it might not work without limitless spin idk.
but my biggest problem with these kind of engines is that i have alot of trouble making the piston work with the right length according to wheel-size

so if you have any suggestions i would gladly like to know anything and everything about this topic so i can build better mechanical machines in general