The heat value of the spark plug is 6 degrees instead of 7 degrees

Spark plug calorific value

The 6 degrees and 7 degrees mentioned above all refer to the calorific value of the spark plug.What is the calorific value? Simply put, it refers to the ability of the spark plug to heat and dissipate heat.There are 9 levels of calorific value of spark plugs, 1-3 is low calorific value, 4-6 is medium calorific value, and 7-9 is high calorific value.The higher the calorific value, the stronger the heat-receiving and heat-dissipating ability. This kind of spark plug is also called a cold spark plug, otherwise it becomes a hot spark plug.Generally, the original spark plugs equipped with vehicles have three calorific values ​​of 5, 6, and 7.

Application of spark plug calorific value

High calorific value spark plugs (cold type spark plugs) are suitable for high-power engines with high speed and high compression ratio; while low calorific value spark plugs (hot type spark plugs) are suitable for low-speed, low compression ratio low-power engines.The calorific value of the spark plugs equipped with each engine is the best calorific value obtained by the manufacturer after a lot of research and experiments. When we switch to spark plugs with other calorific values, we must refer to the original calorific value to choose.

Replacement principle of spark plug calorific value

The principle of changing the calorific value of the spark plug is based on the calorific value of the original spark plug, and the upper and lower difference is controlled within one.(Otherwise, the normal operation of the engine will be affected in the slightest, and the spark plug or even the damage of the engine will be caused in the severe case),soIf the original spark plug has a calorific value of 6, it is feasible to switch to a 7 spark plug.But it must be changed according to actual usage,For example: If the vehicle often runs at high speeds and continues to drive at high speeds, you can switch to spark plugs with higher calorific value.