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Visual Dynamics of Camshaft Motion

Visual Dynamics of Camshaft and Valve Train Motion


This graph shows the lift, velocity, and acceleration of valve train components as the cam rotates and acts on the cam follower.



 The diagram above shows the displacement, or lift, of the valve as the cam rotates.  Note the angle is displayed in cam degrees, not crankshaft degrees (since the camshaft turns half the speed of the crankshaft).



 This chart shows the speed, or velocity, of the valve train as the camshaft turns.  Velocity is the mathematical first derivative of lift.  The valve moves at a constant slow speed during the opening and closing ramps, and its speed is greatest around the midpoint of the flank of the lobe.



 The graph above shows the second derivative of lift, acceleration.  The third derivative, jerk, is not shown on this page.

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