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internal combustion engines


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This is the delay period as mentioned above,it occurs in CI engines only.The delay period is the time between injection of the fuel and the start of combustion.There is a high pressure rise after the start of combustion which is called uncontrolled combustion.This is what gives "diesel knock" reducing the delay period reduces uncontrolled combustion and therefore reduces the knock.The common rail fuel system working at pressures in excess of 1600 bar reduces this delay period ,this is due to a number of factors but mainly due to a finer spray which is heated up quicker and igniting the fuel in a shorter period of time reducing thedelay period and therfore a quieter running CI engine

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