火花塞有热型火花塞、中型火花塞和冷型火花塞。其绝缘体长度h=8毫米为冷型,h=11～14毫米为中型,h=18～20毫米为热型),一般热型火花塞的传热途径长,散热慢,适用于燃烧温度较低的发动机;而冷型火花塞的传热途径短,适用于燃烧温度高的发动机(高转速、高压缩比的汽油发动机和二冲程摩托发动机)。火花塞的型号选择应根据发动机的性能和使用条件而定,各发动机厂家在使用说明书中,都有明确规定,发动机随着功率、冷却方法、压缩比、转速和其它参数的不同而有不同的温度状况,因此,配用具有相适应的火花 Spark plugs have hot spark plugs, medium spark plugs and cold spark plugs. The insulator length h = 8 mm for the cold type, h = 11 to 14 mm for the medium, h = 18 to 20 mm for the thermal type), the general heat-type spark plugs long heat transfer, slow cooling, suitable for combustion temperature is low The cold-type spark plug has a short heat transfer path and is suitable for engines with high combustion temperatures (high speed, high compression ratio gasoline engines and two-stroke motorcycle engines). Spark plug model selection should be based on the performance of the engine and conditions of use, the engine manufacturers in the operating instructions, there is a clear rule, the engine with power, cooling method, compression ratio, speed and other parameters have different temperatures Therefore, with the appropriate spark