1. What is Cam Lift?

Cam lift refers to the maximum height that the cam lobe lifts the lifter or follower. It's a crucial measurement in engine performance, determining how much the valve opens during engine operation.

2. How Does the Calculator Work?

The calculator uses the cam lift formula:

Where:

• \( Valve\ Lift \) — Maximum valve lift in millimeters
• \( Ratio \) — Rocker arm ratio (decimal value)

Explanation: The rocker arm ratio multiplies the cam lift to determine the actual valve lift. This calculator works in reverse to determine the required cam lift for a desired valve lift.

3. Importance of Cam Lift Calculation

Details: Accurate cam lift calculation is essential for engine builders and performance tuners to select the right camshaft for their application and achieve desired valve timing and engine performance characteristics.

4. Using the Calculator

Tips: Enter valve lift in millimeters and rocker ratio as a decimal value (e.g., 1.5:1 ratio would be entered as 1.5). Both values must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical rocker arm ratio?
A: Most production engines use ratios between 1.5:1 and 1.7:1, while performance engines may use ratios up to 2.0:1.

Q2: How does cam lift affect engine performance?
A: Greater cam lift typically allows more air/fuel mixture into the cylinder, potentially increasing power at higher RPMs, but may reduce low-end torque.

Q3: What's the relationship between cam lift and duration?
A: While lift determines how far the valve opens, duration determines how long it stays open. Both factors work together to determine engine breathing characteristics.

Q4: Can I use this for both intake and exhaust valves?
A: Yes, but note that some engines use different ratios for intake and exhaust valves.

Q5: What about valve spring considerations?
A: Higher cam lifts require stiffer valve springs to prevent valve float at high RPMs.