Cam 21 Z
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This graph illustrates lobe lift in inches on the vertical axis (y axis) and degrees of duration across the horizontal axis (x axis). This particular camshaft has 0.470-inch lift and 224 degrees of duration measured at 0.050 lobe lift. The blue triangular area is the overlap area, which is where the exhaust valve is just starting to close and the intake is just beginning to open. To determine the lobe separation angle, add the exhaust lobe centerline (BTDC) to the intake centerline (ATDC) and divide by 2. As an example, if the exhaust lobe centerlines is 116 degrees BTDC and the intake centerline is 106 degrees ATDC we simply calculate 116 + 106 = 222/2 to get 111 degrees. Remember, the lobe separation angle is stated in camshaft degrees and the intake centerline is always expressed in crankshaft degrees. View Related Article
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