发动机经修理后,特别是经过搪缸加大尺寸后,组装时如仍装用原标准的气缸盖,则压缩比就发生了变化。由于目前汽车发动机的设计、生产愈来愈多地采用提高压缩比的办法,来达到增大有效功率、扭矩、甚至提高转速的目的。这种提高压缩比的措施,显然受到燃油品质和自燃点的制约,所以汽油机的压缩比总保持在6～9范围内。现今 After the engine has been repaired, especially after the larger size of the boring cylinder, the assembly still retains the original standard cylinder head, the compression ratio has changed. Due to the current automobile engine design, production more and more to improve the compression ratio approach to achieve increased effective power, torque, and even increase the speed of the purpose. This increase compression ratio measures, apparently subject to the quality of fuel and auto-ignition point, so the total compression ratio of the gasoline engine maintained at 6 to 9 range. now