I once saw a video on valve fluctuation. And I saw that the valve spins até high rpm. I heard that the piston rings also spin, except for two strokes, that there is a lock preventing the rings from spining. Why does this occur? What is the physics involved in this? If the piston had a movable upper pin, like a ball, would it also work spinning?
Sorry for the english, i'am from Brazil. And i use a Translator :D