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Desmo Shim Calculation Formula:
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The Desmo shim calculation is used to determine the correct shim size for Ducati's desmodromic valve system. It ensures proper valve clearance for optimal engine performance and longevity.
The calculator uses the Desmo shim formula:
Where:
Explanation: This calculation determines what size shim you need to achieve the proper valve clearance specification.
Details: Correct valve clearance is critical for engine performance, fuel efficiency, and preventing valve train damage. Too tight clearance can cause valve burning, while too loose clearance reduces power and increases noise.
Tips: Enter all measurements in millimeters. Ensure accurate measurements of current clearance and refer to your service manual for the correct desired clearance specification for your specific engine model.
Q1: How often should valve clearances be checked?
A: Typically every 12,000 miles or as specified in your motorcycle's service manual. More frequent checks may be needed for high-performance or heavily used engines.
Q2: What tools are needed for shim replacement?
A: You'll need feeler gauges, shim kit, valve cover gasket, torque wrench, and basic mechanic's tools. Special tools may be required for specific engine models.
Q3: Can I reuse old shims?
A: Shims can be reused if they're in good condition and the correct thickness, but they should be inspected for wear and measured accurately before reuse.
Q4: What if the calculated shim size isn't available?
A: Use the closest available size and recheck clearance. Minor adjustments may be acceptable within manufacturer's tolerance specifications.
Q5: Should I adjust both intake and exhaust valves?
A: Yes, both intake and exhaust valves typically require periodic adjustment, though they may have different clearance specifications.