In a four-stroke/cycle diesel engine, the camshaft rotates at __________.
β’ Relationship between camshaft and crankshaft in a four-stroke engine β’ How many crankshaft revolutions occur in one complete four-stroke cycle (intake, compression, power, exhaust) β’ How often the valves need to open and close during that full cycle
β’ First, count how many strokes are in the cycle and how many crankshaft revolutions are needed for those strokes. β’ Ask yourself: during those strokes, how many times should each valve (intake/exhaust) open and close? β’ From that, decide whether the camshaft needs to turn faster, slower, or the same speed as the crankshaft to match proper valve timing.
β’ Be clear on: 1 full four-stroke cycle = how many crankshaft revolutions? β’ Check that your chosen camshaft speed would make each cam lobe operate a valve the correct number of times per full cycle. β’ Eliminate any option that would make the valves open too often or not often enough for each full engine cycle.
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