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Lobe Separation Angle Formula:
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Lobe Separation Angle (LSA) is a camshaft specification that represents the angular distance between the centerlines of the intake and exhaust lobes. It's a critical parameter in camshaft design that affects engine performance characteristics.
The calculator uses the LSA formula:
Where:
Explanation: The LSA is calculated as the average of the intake and exhaust centerline angles, providing a measure of how widely separated the cam lobes are from each other.
Details: LSA affects engine characteristics such as idle quality, torque curve, power band, and emissions. Narrower LSAs typically produce more low-end torque, while wider LSAs improve high-RPM power and idle quality.
Tips: Enter both intake and exhaust centerline angles in degrees. Values should be positive numbers representing the angular measurements of your camshaft specifications.
Q1: What is a typical LSA range for performance cams?
A: Performance camshafts typically have LSA values between 106-114 degrees, with tighter LSAs for more aggressive idle and broader torque curves.
Q2: How does LSA affect engine vacuum?
A: Wider LSA camshafts generally produce better engine vacuum at idle, which can improve drivability and accessory operation.
Q3: Can LSA affect emissions?
A: Yes, LSA can impact emissions. Wider separation angles tend to reduce overlap, which can help lower hydrocarbon emissions.
Q4: What's the relationship between LSA and cam duration?
A: While related, LSA and duration are separate specifications. Duration refers to how long valves stay open, while LSA refers to the angular separation between intake and exhaust lobes.
Q5: Should I choose a cam based on LSA alone?
A: No, LSA is just one of several important camshaft specifications. Duration, lift, and lobe design should all be considered together when selecting a camshaft.