Abstract: There are many factors influencing the performance of diesel engine, and fuel injection system is undoubtedly the most important one. This paper analyzes the effects of each parameter of the fuel injection system on the performance of diesel engine, and proposes a series of improvement methods, in view of the existing problems and the causes of X6105 diesel engine. Through bench tests, the optimal match condition of this engine's fuel injection system was found out, achieving the goals of improving the performance of the engine, enhancing the market competition, widening the application fields and adapting to the requirements of the down-hole power unit.

Key words: X6105 diesel engine, Fuel injection system, Optimal match, Emission control