Jock itch (tinea cruris) is a fungus, the same one that causes athlete's foot and scalp ringworm. The groin area is the perfect place for the fungi to grow and cause a fungal infection because it is moist, warm and dark.
The camshaft lift is the resultant net rise of the valve from its seat. The farther the valve rises from its seat the more airflow can be provided, which is generally more beneficial. Greater lift has some limitations.
Merge this question into. Split and merge into it. Answer by Dorsai. Confidence votes 1.6K. On some engines the cam-shaft does not directly operate the valves, but uses a lever (the Cam Follower) to transmit the force from the cam to the valve. Basically they are levers, and they are used to open the valves.