1. What Is Desmo Shim Calculation?

Desmo shim calculation is a method used to determine the correct shim thickness for valve clearance adjustments in desmodromic valve systems. This ensures optimal engine performance and longevity.

2. How Does The Calculator Work?

The calculator uses the standard desmo shim formula:

Where:

• \( Old\ Shim \) — Current shim thickness (mm)
• \( Measured\ Clearance \) — Actual measured valve clearance (mm)
• \( Desired\ Clearance \) — Manufacturer's recommended clearance (mm)

Explanation: This formula calculates the exact shim thickness needed to achieve the manufacturer's specified valve clearance.

3. Importance Of Proper Shim Calculation

Details: Correct valve clearance is critical for engine performance, fuel efficiency, and preventing valve train damage. Proper shim calculation ensures optimal valve operation.

4. Using The Calculator

Tips: Enter the current shim thickness, measured valve clearance, and desired clearance values in millimeters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is valve clearance important in desmodromic systems?
A: Proper valve clearance ensures optimal valve timing, prevents valve float at high RPM, and reduces wear on valve train components.

Q2: How often should valve clearances be checked?
A: Typically every 6,000-12,000 miles or as specified in your motorcycle's service manual.

Q3: What happens if valve clearance is too tight?
A: Too little clearance can cause valves to not close fully, leading to loss of compression, burnt valves, and reduced engine performance.

Q4: What happens if valve clearance is too loose?
A: Excessive clearance causes noisy operation, reduced valve lift, and accelerated wear on camshafts and followers.

Q5: Are shims available in standard sizes?
A: Yes, shims typically come in standardized thickness increments (usually 0.05mm or 0.025mm steps) to allow for precise adjustment.