... optimum engine life；发动机最佳寿命 optimum engine performance；发动机最佳性能 optimum fuel consumption；最佳燃料耗量 ...
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结果表明，一定长度的进气管可以获得最佳发动机综合性能，过长或没有进气管对发动机的性能都不利。
The results showed that the engine could give its rating power only at the definite length of intake.
高性能柴油发动机的运作十六烷值50或更高价值的最佳。
High performance diesel engines operate best with cetane values of 50 or higher.
试验结果表明提高发动机压缩比和选择最佳点火提前角后，发动机性能有一定提高。
The result show that performance of engine will be improve by increasing compression ratio of engine and using best ignition advanced angle.
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