1. What is Piston Valve Clearance?

Definition: Valve clearance is the radial gap between the piston and valve in an internal combustion engine.

Purpose: Proper clearance prevents valve-piston contact while ensuring optimal engine performance and longevity.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( C_v \) — Valve clearance (meters)
• \( D_{bore} \) — Cylinder bore diameter (meters)
• \( D_{valve} \) — Valve diameter (meters)

Explanation: The difference between bore and valve diameters is divided by 2 to get the radial clearance on each side.

3. Importance of Valve Clearance

Details: Correct clearance prevents engine damage from valve-piston contact while maintaining proper compression and airflow.

4. Using the Calculator

Tips: Enter both diameters in meters (convert from mm if needed). Bore diameter must be larger than valve diameter.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical valve clearance range?
A: Most engines have 0.5-1.5mm clearance, but always consult manufacturer specifications.

Q2: Why measure in meters?
A: The calculator uses SI units, but you can input millimeter values divided by 1000.

Q3: What if my bore diameter is smaller than valve diameter?
A: This indicates an impossible configuration - valves must always be smaller than the bore.

Q4: Does this account for thermal expansion?
A: No, this calculates cold clearance. Running clearance will be smaller due to expansion.

Q5: How often should valve clearance be checked?
A: Typically every 20,000-30,000 miles or per manufacturer recommendations.