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气缸盖

福特5000cc引擎的气缸盖

气缸头又称为引擎的上半座,座落于气缸床之上,在顶置气孔设计(OHV)的引擎中,其内部包含了主要的阀机构,如气孔、气孔弹簧、气门挺杆/摇臂, 而在顶置凸轮轴(SOHC or DOHC)设计的引擎中,又包括了凸轮轴,凸轮齿盘等等。同时也包括了燃烧室。火花塞也安装于此。气缸头跟气缸床被紧密地锁在一起,中间夹有气缸床垫片。

气缸头可视为发挥引擎性能的重要关键,如进排气道的流量大小,跟凸轮轴的搭配将密切地影响容积效率。燃烧室的形状并决定了引擎容不容易爆震的特性,其容积也跟压缩比息息相关。

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气缸盖
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