Ring Gap Formula:
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Definition: This calculator estimates the proper gap for piston rings based on engine bore diameter and a gap factor.
Purpose: It helps engine builders and mechanics determine the correct piston ring gap for optimal engine performance and longevity.
The calculator uses the formula:
Where:
Explanation: The bore diameter is multiplied by an appropriate gap factor to determine the proper clearance for thermal expansion.
Details: Correct ring gap prevents engine damage from thermal expansion while maintaining proper compression and oil control.
Tips: Enter the bore diameter in millimeters and select an appropriate gap factor (default 0.005). All values must be > 0.
Q1: Why is ring gap important?
A: Proper gap allows for thermal expansion while maintaining seal. Too small can cause ring butting; too large reduces compression.
Q2: What's a typical gap factor range?
A: Most engines use 0.004-0.006, with 0.005 being a common default value.
Q3: When would I use different gap factors?
A: Higher factors (0.006) for forced induction or nitrous; lower factors (0.004) for street applications.
Q4: How do I measure bore diameter?
A: Use a dial bore gauge at multiple points in the cylinder to get accurate measurements.
Q5: Does this apply to all ring types?
A: Top rings typically use this calculation, while second rings and oil rings may have different specifications.