Iridium
Size:OEM Standard Thread size:standard Warranty:40000 Miles Quality:High Level Type:spark plug
The designer used the length of the insulator skirt to solve this contradiction, so two kinds of spark plugs appeared. One was a short skirt with a small heating area and fast heat dissipation. Large, slow heat dissipation, so the skirt temperature is higher, known as cold spark plugs.
In the standard of the spark plug, the heat value is usually used to characterize the thermal characteristics of the spark plug. The spark plug heat value represents the balance of the heat absorption and heat dissipation of the spark plug insulator skirt. The higher the heat value. The stronger the balance between heat absorption and heat dissipation, the lower the thermal value of the hot spark plug and the higher the thermal value of the cold spark plug. Generally, engines with high power and large compression ratios use cold spark plugs with high heating value; on the contrary, engines with low power and small compression ratios select thermal spark plugs with low heat value. Generally, the selection of spark plugs is determined by the factory through product stereotyping experiments and should not be replaced at will.
The spark plug is composed of an insulator and a metal shell. The metal shell has threads for screwing into the cylinder. The insulator is installed in the shell, which passes through a center electrode and a terminal nut on the upper end of the center electrode. The high-voltage wire from the power distribution board; a ground electrode is welded on the lower end of the casing, and a gap of 0.6-1.0 mm is provided between the center electrode and the ground electrode. High-voltage electricity will ignite the mixture when it enters the ground through this gap. .
Spark plugs can work properly without carbon deposits. Practice has proven that when the spark plug insulator is maintained at a temperature of 500-600 ° C, oil droplets falling on the insulator can be burned away immediately without forming carbon deposits (above this temperature, premature combustion, below this temperature) There is coke).
For high-speed, high-compression high-power engines, because of the large amount of heat generated, the spark plugs need to dissipate heat quickly; for low-power engines with low and medium compression ratios, which require less heat, the spark plugs require slow heat dissipation.
Obviously, cold spark plugs are suitable for high-speed, high-compression high-power engines; hot spark plugs are suitable for low-power, low-speed and low-compression engines.