I am mechanical engineer. I have done research on cam follower mechanism from last five years. Cam is used to open and close valve of I.C Engine. My cam follower system is different then today's system. In my cam follower system Energy used to move follower and we get output energy on cam. We get 3 times more energy on cam than we use to move follower. You can find exact drawing and prototype at mechanicalresearch.info In short Clean Energy<Coal