1. What is the 1.5 to 1.6 Rocker Calculator?

The 1.5 to 1.6 Rocker Calculator estimates valve lift change when switching from 1.5 to 1.6 rocker ratio. It helps automotive enthusiasts and mechanics predict how valve lift will be affected by this rocker arm ratio change.

2. How Does the Calculator Work?

The calculator uses the rocker ratio formula:

Where:

• \( Old\ Lift \) — Original valve lift measurement in inches
• \( 1.6 / 1.5 \) — Ratio conversion factor (1.0667)

Explanation: The formula calculates the proportional increase in valve lift when changing from a 1.5 to a 1.6 rocker ratio, maintaining the same cam profile.

3. Importance of Valve Lift Calculation

Details: Accurate valve lift calculation is crucial for engine performance tuning, ensuring proper valve clearance, and preventing valve-to-piston interference in modified engines.

4. Using the Calculator

Tips: Enter the original valve lift measurement in inches. The value must be greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why change from 1.5 to 1.6 rocker ratio?
A: Increasing rocker ratio can improve valve lift and duration without changing the camshaft, potentially increasing engine performance.

Q2: What are typical valve lift values?
A: Typical valve lift values range from 0.400" to 0.600" for performance engines, though this varies by application and engine type.

Q3: Does this affect valve spring requirements?
A: Yes, increased valve lift may require stronger valve springs to prevent valve float at higher RPMs.

Q4: Are there limitations to this calculation?
A: This calculation assumes the cam profile remains unchanged and only the rocker ratio is modified. Actual results may vary based on specific engine components.

Q5: Should I check piston-to-valve clearance?
A: Absolutely. Any increase in valve lift requires verification of sufficient piston-to-valve clearance to prevent engine damage.