发动机气门的调整方法已多有论述 ,但存在以下不足 :一是理论分析太繁琐 ,如配气相位分析、曲轴、凸轮轴转角推算等 ;二是不便于记忆 ,如图表法等 ;三是虽介绍了“口诀” ,但理论分析不够。本文的特点是 :理论分析简捷清晰 ,调整方法简单实用。1　示功图与气门工况随着发动机转 Engine valve adjustment methods have been discussed, but there are the following deficiencies: First, the theoretical analysis is too cumbersome, such as gas phase analysis, crankshaft, camshaft corner estimation, etc .; the second is not easy to remember, such as the chart method; Third, although the Introduced “formulas”, but the theoretical analysis is not enough. This article is characterized by: simple and clear theoretical analysis, adjustment method is simple and practical. 1 Kinetic diagram and valve conditions as the engine turns