How is camshaft lift defined?

Camshaft lift is defined as the height of the lobes on the camshaft. This measurement is crucial because it directly affects how far the engine's intake and exhaust valves open during operation. The lift determines the volume of air and fuel that can enter the combustion chamber, significantly influencing engine performance, efficiency, and power output.

Higher lift typically allows for more air and fuel to enter, which can enhance performance, particularly at higher RPMs. Understanding camshaft lift is vital for tuning engines and making modifications, as it can greatly affect the timing and effectiveness of the valve operation.

The other options relate to different aspects of valve operation but do not accurately define camshaft lift itself. For instance, how far the valves open, the duration they remain open or closed, are related to lift but do not specifically define it.