以不同密封座面直径的油嘴在油泵试验台上和发动机上的试验证明，适当地减少密封座面直径，可使油嘴压力室内的压力升高，针阀开启时间缩短，并使泵端、嘴端的压力波形发生变化，发动机的油耗有所降低，文内给出了试验结果，并对原因作了初步的分析。 The tests on the oil pump test bench and the engine with different sealing seat diameter nozzles proved that reducing the diameter of the sealing seat surface properly can increase the pressure in the pressure chamber of the oil nozzle and shorten the opening time of the needle valve and make the pump end and the mouth The pressure waveform at the end changes, the fuel consumption of the engine is reduced, the test results are given in the article, and the reasons are preliminarily analyzed.