spark plug in auto engine is like the lighter if the spark plug is broken, the auto will not start at all
The working principle of the ignition spark plug is high-voltage discharge. When the pulsed high-voltage electricity generated by the ignition coil is sent to the electrode of the spark plug, the high-voltage electricity will break down the mixture and generate this electric spark. The car lights up. It can be said that it is a very important part in the engine.
The type of ignition spark plug is distinguished by material, and the design life of different types is completely different. It is mainly divided according to the electrode material, such as nickel alloy, silver alloy, yttrium gold, platinum, iridium, double iridium, iridium Platinum spark plugs and more.
Performance of ignition spark plug
The calorific value of the spark plug is a parameter that indicates the speed of its heat dissipation. Generally, the larger the calorific value, the faster the heat dissipation, which means the lower the temperature of the spark plug. Due to different engine types, spark plugs can generally be divided into two types: cold type and hot type. Of course, the cold type and the hot type are relative, which reflects the thermal characteristics of the spark plug. The designer of the spark plug generally uses the length of the insulator group of the spark plug to control the heat dissipation speed of various spark plugs. The shorter the group part, the smaller the heating area and the faster the heat dissipation, so the temperature of the group part should be lower. It is called a cold type spark plug; if the group part is long, the heating area is large and the heat dissipation is relatively slow, so the temperature of the group part is higher, which is called a hot type spark plug.
For cold-type spark plugs, because of its large calorific value and fast heat dissipation, the temperature of the power generation part is relatively low. When the fuel in the mixed gas is attached to the electrode, the fuel is not easy to volatilize by itself, and it is easy to form carbon deposits, which will make the electrode Causes electricity to run, and the gap between the electrodes becomes smaller, which is not conducive to the generation of sparks between the two poles, and even cannot generate sparks. This causes problems such as the engine cannot be started or the acceleration is poor. Cold-type spark plugs are generally used in high-speed, high-compression ratio high-power engines.
For hot-type spark plugs, because of its small calorific value, slow heat dissipation, and high temperature of the power generation part, although the high-temperature electrode can purify the carbon deposits attached to it, the temperature of the spark plug is too high, and it will be discharged before the discharge. That is to say, the phenomenon of igniting the mixture can easily lead to deflagration, and even burn the ceramics of the head of the spark plug, and ablate and dissolve the electrodes. Hot-type spark plugs are generally used in low-power engines with low-to-medium-speed and low-compression ratios.
How to use ignition spark plug correctly
When the spark plug cannot be ignited, it is necessary to check whether the spark plug has carbon deposits, and pay attention to determine whether it is damaged after cleaning. If it is damaged, it should be replaced; in addition, when the service life of the spark plug expires, it must be replaced. Now the life of spark plugs is generally about 90,000 kilometers. When replacing, the appropriate spark plug should be selected according to the performance of the engine. When removing the spark plug, it is found that the electrode carbon deposition is serious, and the spark plug with a larger calorific value should be used when replacing it; if the engine is found to have hot ignition, it should be replaced. Spark plugs with a lower calorific value. At the same time, for a multi-cylinder engine, it should be ensured that the old and new spark plugs and the spark plug model are the same, otherwise the ignition degree of each cylinder will be different, resulting in different combustion conditions of each cylinder. It is recommended to replace all the spark plugs at the same time. When it is difficult to find the same spark plug as the original spark plug, it is required that the screw-in thread length, thread diameter and calorific value of the substitute spark plug must be consistent with the original model.
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