When the gap between a valve and its actuator (e.g., rocker arm, camshaft lobe) is too large, the valve will not be fully opened or closed as intended. This insufficient lift duration can lead to reduced engine performance and potential damage.
Proper valve clearance is crucial for optimal engine operation. Insufficient lift impedes airflow into and out of the combustion chamber, impacting power output, fuel efficiency, and emissions. Historically, adjusting valve clearances was a regular maintenance item, particularly with older engine designs that used solid lifters. While modern engines often utilize hydraulic lifters or other self-adjusting mechanisms, understanding this principle remains important for diagnosing performance issues and working with older vehicles or specialized engines.
