What is the outcome of excessive valve clearance?

Excessive valve clearance in an engine refers to a greater-than-normal gap between the valve and the rocker arm or cam, which affects the timing and operation of the valves. When valve clearance is excessive, it leads to a delay in the valve opening and closing events. As a result, the valves will open later than intended, which can reduce the engine's efficiency as the intake of air-fuel mixture and exhaust expulsion are both impacted. Additionally, the closing of the valves occurs earlier than designed, preventing the cylinder from fully utilizing the combustion process. Thus, the outcome of excessive valve clearance is that valves open late and close early, which can result in decreased engine performance and efficiency.