The characteristic of the spark plug

In the standard of spark plug, the calorific value is usually used to characterize the thermal characteristics of spark plug. The calorific value of spark plug represents the balance ability of heat absorption and heat dissipation of spark plug insulator skirt. The higher the calorific value is. The stronger the balance between heat absorption and heat dissipation, so the calorific value of hot spark plug is low and that of cold spark plug is high. Generally, cold spark plugs with high calorific value are selected for engines with high power and high compression ratio; On the contrary, the engine with low power and low compression ratio selects the hot spark plug with low calorific value. Generally, the selection of spark plugs is determined by the factory through the product type test, and should not be replaced at will