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![]() The difficulty in measuring the opening and closing points is the result of the very shallow and gradual starting and stopping of the valve motion. Therefore the lobe center is used to reference cam timing. The opening and closing points and resultant figures of the cam, although important, are very difficult to reference to set cam timing and are, after all, the result of where the lobe center is placed. The process of “degreeing” cams allows the engine builder to place the lobe center of a cam in the correct orientation with reference to the crankshaft. The location of this center in relation to the rotational position of the crankshaft is known as the lobe center. Naturally, then it also has a middle or center. Like any event, it has a beginning and an end. The opening and closing process of an inlet or exhaust valve as controlled by a cam lobe constitutes a complete “event” in the cycle of the engine. One of the least understood topics and regarding engine tuning and building continues to be the concept of cam timing and “lobe centers”.
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