Theoretical: In the theoretical Cycle, when the Piston reaches the Top Dead Center (TDC), Now the fuel is injected into the cylinder by the high-pressure fuel injector at the end of compression stroke. Because to close the valve completely, it will take some time. 360° of crankshaft rotation.Īctual: In the actual Cycle, The inlet valve starts closing right after the piston starts moving upward. These two strokes (i.e., suction and compression stroke) complete one revolution of the crankshaft. The Air in the cylinder will be compressed. At this BDC The Inlet Valve will close, and the piston will start to move upward. Theoretical: In the theoretical Cycle, on completion of the suction stroke, The compression stroke starts when the piston reaches the Bottom Dead Center (BDC). so it has to be started opening a bit early. Because in the actual engine the valve cannot be open instantaneous. Actual: In the actual Cycle, the inlet valve will be started opening just before the piston reaching to the Top Dead Center (TDC) from the previous cycle.
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