Valve timing and valve lift are key technical parameters of an engine.

配气相位、气门升程是发动机最关键的技术参数指标之一.

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In - cylinder flow characteristics under variable valve lift ( VVL ) were studied single - cylinder - valve optical engine.

在一台四气门可视化光学发动机上,研究了可变气门升程下缸内气体流动特性.

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