The spark plug refers to the amount of heat dissipated by itself as the [heat value], and the heat dissipation is called the high calorific value (cold type), and the relative heat dissipation is called the low calorific value (combustion type). However, the calorific value is high. It depends on the temperature of the in-cylinder mixture and the design of the spark plug. The low calorific value spark plug insulator has a longer term, and the surface area covered by the flame and the volume of the air pocket are large. In addition, since the heat is radiated from the root of the insulator to the outer casing, the heat dissipation is small, and the temperature of the center electrode is likely to rise. In response to these, the insulator of the high calorific value spark plug is relatively short, and the surface area covered by the flame and the volume of the air pocket are small. In addition, due to the short heat dissipation path and high heat dissipation, it is not easy to cause the temperature of the center electrode to rise.
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