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为了保证火花塞工作在500℃～750℃之间(温度过高发动机易提前点火,温度过低火花塞易积碳,工作不良),火花塞有“热型”和“冷型”之分。绝缘体裙部短的火花塞,吸热面积小,传热距离短,散热容易,绝缘体裙部温度低,称为“冷型”火花塞,反之为“热型”火花塞。为了便于选择使用,火花塞的类型用标注在其外壳上的热值数字表示出来。火花塞的热值表明了其工作温度范围和散热能力,国产火花塞的热值用阿拉伯数字1、2、3、4、5、6、7、8、9……表示,数字越
In order to ensure that the spark plug work between 500 ℃ ~ 750 ℃ (too high temperature engine easy to pre-ignition, the temperature is too low spark plug carbon deposition, poor work), spark plugs have “hot” and “cold” points. Insulator short skirt spark plug, small heat absorption area, short heat transfer, heat dissipation, insulation skirt temperature is low, known as the “cold” spark plug, whereas the “hot” spark plug. In order to facilitate the choice of use, the type of spark plug marked with the calorific value figures on its shell. The calorific value of the spark plug shows its operating temperature range and cooling capacity, the calorific value of domestic spark plugs with Arabic numerals 1,2,3,4,5,6,7,8,9 ...... said the number of the more