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Camshaft Duration Formula:
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Camshaft duration refers to the amount of time, measured in crankshaft degrees, that a valve remains open during the engine cycle. It's a critical specification that affects engine performance, power band, and efficiency.
The calculator uses the camshaft duration formula:
Where:
Explanation: The total camshaft duration is calculated by adding the intake valve duration and exhaust valve duration measurements together.
Details: Proper camshaft duration calculation is essential for engine tuning, performance optimization, and ensuring proper valve timing for optimal combustion and power delivery.
Tips: Enter the intake duration and exhaust duration values in degrees. Both values must be positive numbers representing the valve open duration measurements.
Q1: What is a typical camshaft duration range?
A: Duration typically ranges from 200-300 degrees for street performance cams, with race cams often exceeding 300 degrees.
Q2: How does duration affect engine performance?
A: Longer duration generally increases high-RPM power but may reduce low-end torque. Shorter duration improves low-RPM torque but limits top-end power.
Q3: What's the difference between advertised duration and duration at 0.050"?
A: Advertised duration is measured at valve lash point, while duration at 0.050" is measured when the valve is lifted 0.050 inches, providing a more standardized comparison.
Q4: Can I use this calculator for both hydraulic and solid lifter cams?
A: Yes, the basic duration calculation works for both types, though actual performance characteristics will differ based on cam design and lifter type.
Q5: How does lobe separation angle relate to duration?
A: Lobe separation angle (LSA) affects how the intake and exhaust durations overlap, influencing engine characteristics like idle quality, torque curve, and emissions.