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COMP Cams Effect of Changes In Cam Timing and Lobe Separation Angle
Effect Of Changes In Cam Timing And Lobe Separation Angle
The following tables illustrate how variations in lobe separation angle and cam timing will effect the behavior of the engine in which the camshaft is installed.
EFFECTS OF ALTERING CAMSHAFT TIMING
Advancing
Begins Intake Event Sooner
Open Intake Valve Sooner
Builds More Low-End Torque
Decrease Piston-Intake Valve Clearance
Increase Piston-Exhaust Valve Clearance
Retarding
Delays Intake Closing Event
Keeps Intake Valve Open Later
Builds More High-RPM Power
Increase Piston-Intake Valve Clearance
Decrease Piston-Exhaust Valve Clearance
EFFECTS OF CHANGING LOBE SEPERATION ANGLE (LSA)
Tighten (smaller LSA number)
Moves Torque to Lower RPM
Increases Maximum Torque
Narrow Power band
Builds Higher Cylinder Pressure
Increase Chance of Engine Knock
Increase Cranking Compression
Increase Effective Compression
Idle Vacuum is Reduced
Idle Quality Suffers
Open Valve-Overlap Increases
Closed Valve-Overlap Increases
Natural EGR Effect Increases
Decreases Piston-to-Valve Clearance
Widen (larger LSA number)
Raise Torque to Higher RPM
Reduces Maximum Torque
Broadens Power Band
Reduce Maximum Cylinder Pressure
Decrease Chance of Engine Knock
Decrease Cranking Compression
Decrease Effective Compression
Idle Vacuum is Increased
Idle Quality Improves
Open Valve-Overlap Decreases
Closed Valve-Overlap Decreases
Natural EGR Effect is Reduced
Increases Piston-to-Valve Clearance
CAMSHAFT GEOGRAPHY AND LOBE FUNCTION
Tighten (smaller LSA number)
Max Lift or Nose
Flank
Opening Clearance Ramp
Closing Clearance Ramp
Base Circle
Exhaust Opening Timing Figure
Exhaust Closing Timing Figure
Intake Opening Timing Figure
Intake Closing Timing Figure
Intake to Exhaust Lobe Separation