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Old 08-17-2001, 09:50 AM
Southern_Son
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As you know, the crankshaft rotates twice for each complete cycle of intake, compression, ignition and exhaust of fuel. Therefore, the camshafts and associated lifters, valves, etc. only actuate once during the 2 rotations of the crankshaft. I a rod were knocking, you would hear that twice for each spark plug firing. If a valve were ticking, you would hear it only once for each firing.
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