What is the formation and function of valve clearance?

Valve clearance is the clearance between the camshaft on the valve and the parts that can hold the valve open when the valve is closed.

Valve clearance directly reflects the performance of the engine.

If the valve clearance is large, the valve opening is small and the air intake is small;

Small valve clearance, large valve opening and large air intake.

If the valve clearance is too large and the air intake is too small, the engine will fight and get bored;

If the valve clearance is too small, the valve is not closed tightly, and the air intake is difficult to control, the engine performance will not work.

Is to adjust the opening of the valve.