Editing How to choose a camshaft (section)
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====Calculating duration==== If the duration is not stated on the cam card, it can be easily calculated by adding the intake opening point in degrees to the exhaust closing point. If those points are not known, you can estimate the duration by using the advertised duration and the lobe separation angle: #Add the intake and exhaust advertised durations, then #divide the results by 4, then #subtract the lobe separation angle, then #multiply the results by 2
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