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本文对Ｃａｔ６１２１柴油机的燃烧系统、配气正时及增压排气系统进行了分析，并提出了相应的改进意见，同时设计了螺旋流增压排气系统。
In this paper, the combustion system of Cat6121 diesel engine, the timing of gas distribution and the pressurized exhaust system are analyzed, and the corresponding improvement suggestions are put forward. At the same time, the spiral flow pressurized exhaust system is designed.