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Lift of Valve refers to the maximum height to which an engine valve is lifted during operation, allowing the flow of gases into or out of the combustion chamber. It is a critical parameter in engine design and performance optimization.
The calculator uses the formula:
Where:
Explanation: The lift is calculated by dividing the force required to lift the valve by the stiffness of the valve spring, which represents the spring's resistance to deformation.
Details: Accurate valve lift calculation is essential for proper engine timing, optimal gas flow, fuel efficiency, and preventing valve train component failure. It affects engine power output and emissions.
Tips: Enter the force to lift the engine valve in Newtons (N) and the stiffness of the valve spring in Newtons per meter (N/m). Both values must be positive numbers greater than zero.
Q1: Why is valve lift important in engine performance?
A: Valve lift directly affects the amount of air-fuel mixture that enters the combustion chamber and exhaust gases that exit, impacting engine power, efficiency, and emissions.
Q2: What factors affect valve spring stiffness?
A: Spring material, wire diameter, coil diameter, number of active coils, and spring design all contribute to the overall stiffness of a valve spring.
Q3: How does valve lift relate to camshaft design?
A: The camshaft lobe profile determines the maximum valve lift. The shape of the cam lobe controls how quickly the valve opens, how long it stays open, and how quickly it closes.
Q4: What are typical valve lift values in automotive engines?
A: Typical valve lift values range from 8-12mm for standard production engines, while high-performance engines may have lifts of 15mm or more.
Q5: Can excessive valve lift cause problems?
A: Yes, excessive valve lift can lead to valve-to-piston contact, increased wear on valve train components, and potential engine damage if not properly designed.