The thermal value of the spark plug is usually used to characterize the thermal characteristics of the spark plug. The spark plug heat value indicates the balance between the heat absorption and heat dissipation of the spark plug insulator skirt, and the higher the heat value. The stronger the heat absorption and heat dissipation balance, the lower the heat value of the hot spark plug and the higher the heat value of the cold spark plug. Generally, a high-power, high-compression engine uses a cold-type spark plug with a high heat value; on the contrary, a low-power, low-compression engine uses a hot-type spark plug with a low heat value. Generally, the selection of spark plugs is determined by the factory through product stereotype experiments and should not be replaced at will.
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