4.5.4 Preliminary about the camshaft
Note
Why preliminary? Because for the integrity of the perception of this section, it is necessary to say a few words about the camshaft, and a more detailed description of this detail will be provided below.
The correctness of the alternation of various strokes in the engine cylinders is achieved due to the appropriate location of the cams on the camshaft, as well as by the correct installation of the gas distribution mechanism drive: engagement of the timing gears/pulleys with the drive gear/crankshaft pulley. In a four-stroke engine, the working cycle in all cylinders is completed within two crankshaft revolutions. During this time the intake and exhaust valves in each cylinder must open and close once. This occurs for each revolution of the camshaft. Thus, the camshaft must rotate twice as slow as the crankshaft. In order to do this, the camshaft gear has twice as many teeth as the crankshaft gear, or the pulley must be twice the diameter of the crankshaft pulley.
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