不可忽视凸轮轴的早期磨损发动机凸轮轴的早期磨损俗称“塌鼻子”，表面看来平滑完整，没有划伤磕碰或沟痕，但凸轮轴的几何角度、尺寸已发生了变化。它直接影响了发动机的配气相位，使进排气门的理论行程缩短，破坏了发动机设计上的“吸气充足，排气于净”的理论计算指标... Can not be ignored early wear and tear of the camshaft Early wear and tear of the engine camshaft commonly known as “collapsed nose”, the surface appears smooth and complete, there is no scratches bump or groove marks, but the camshaft geometric angle, size has changed. It directly affects the engine’s gas distribution phase, so that the theory of intake and exhaust stroke shortened, undermining the engine design “sufficient intake, exhaust in the net,” the theoretical calculation of indicators ...