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Lobe Separation Angle Formula:
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Lobe Separation Angle (LSA) is a camshaft specification that calculates the average angle between the intake and exhaust lobe centerlines. It's a critical parameter that affects engine performance characteristics including idle quality, torque curve, and power band.
The calculator uses the LSA formula:
Where:
Explanation: The formula calculates the average of the intake and exhaust lobe centerline angles to determine the lobe separation angle, which indicates how far apart the intake and exhaust lobes are positioned on the camshaft.
Details: LSA affects engine characteristics significantly. Narrow LSA (104-108°) provides more overlap, better top-end power, but rougher idle. Wide LSA (112-116°) gives smoother idle, better low-end torque, and broader power band.
Tips: Enter both intake and exhaust centerline angles in degrees. Values must be positive numbers representing valid camshaft specifications.
Q1: What is a typical LSA range for performance engines?
A: Performance engines typically range from 106-114 degrees, with street performance around 110-112 degrees and race engines using narrower angles (106-108 degrees).
Q2: How does LSA affect engine sound and idle quality?
A: Narrower LSA creates more overlap, resulting in a lumpy idle and distinct performance sound. Wider LSA provides smoother idle and quieter operation.
Q3: Can LSA be changed after camshaft manufacturing?
A: No, LSA is fixed during camshaft grinding. To change LSA, you need a different camshaft with the desired lobe separation angle.
Q4: How does LSA interact with duration and lift?
A: LSA works with duration and lift to determine overall camshaft profile. The combination of these three parameters defines the cam's personality and performance characteristics.
Q5: What LSA is best for street driving?
A: For street applications, LSA of 110-114 degrees typically provides the best compromise between performance, driveability, and emissions compliance.