Page:Investigation of the discharge rate of a fuel-injection system.djvu/2



In connection, with the development of a method for analyzing indicator cards taken from high-speed compression-ignition engines, this investigation was undertaken to determine the average quantity of fuel discharged during each crank degree of the injection period. The fuel discharged by a cam-operated pump and automatic injection valve was collected in a rotating receiver. The weight of fuel discharged per unit time was determined for various crank-angle positions over the entire injection period.

The results show that 98 per cent of the fuel was discharged during an interval of 25 degrees, whereas' the duration of the period from the start to the stop of the fuel spray was 68 degrees. The duration of the period as obtained in these tests checks with the results obtained with the oscilloscope. During the 29 crank degrees after the start of injection and the 14 degrees before the stop of injection only 2 per cent of the total weight of fuel is discharged.