What are the classifications of spark plugs?

After introducing the structure of spark plugs, let's talk about the classification of spark plugs. Spark plugs are divided into cold spark plugs and hot spark plugs. There is no good or bad distinction between the two models. The only difference is whether they are suitable for your car. The specific choice depends on your car. In the instruction manual, the calorific value of the spark plug will be marked when purchasing. The higher the number, the cold spark plug, and the lower the number, the hot spark plug.
Cold type spark plug: The skirt of the cold type spark plug is relatively short, the heating area is small, and the spiral part has good heat dissipation. It is more suitable for cars with high compression ratio and high speed and generates a lot of heat. If the car has a low compression ratio, low speed and low heat generation, the cold type spark plug is used. Spark plug, if the heat is not enough for the spark plug to reach operating temperature, it is easy for the spark plug to form carbon deposits.
Hot spark plugs: Completely opposite to cold spark plugs, the skirt of the spark plug is longer, absorbs heat faster, and dissipates heat generally. For engines with low calorific value and low compression ratio, it can be maintained at normal operating temperature without being overcooled. Carbon deposits are formed, and if a cold spark plug is used in a vehicle with high calorific value, the temperature may be too high and the spark plug electrode may melt.