一、爆震 应该指出,爆震和早燃是两个不同的概念。早燃是由于气门或火花塞等处有积碳,红热的积碳导致了在出现火花之前点着了缸内的空气—燃料混合气。而爆震则发生于点火之后,由末端混合气自燃引起。短期的严重爆震将折断活塞环,破坏气缸垫,持续的爆震,将使进气管回火,损坏机器。爆震现象在汽油机和气体发动机的试验过程中经常发生。汽油机用的汽油通常成分比较稳定,其抗爆指标是辛烷值,一经选定汽油牌号,便可以正常工作,不 One, knocking It should be pointed out that knocking and pre-ignition are two different concepts. Pre-ignition is due to valves or spark plugs have carbon deposition, red hot coke led to the spark before the point of the cylinder air-fuel mixture. The knock occurs after ignition, caused by the end of the mixture of spontaneous combustion. Short-term severe knock will break the piston ring, destroy the cylinder pad, continuous detonation, the intake manifold will be tempering, damage to the machine. Knocking occurs frequently during the testing of gasoline and gas engines. Gasoline gasoline engine usually relatively stable composition, the antiknock index is octane, once the selected gasoline grade, it can work, not