It is not important to look at the spark plug. It is important to know that the temperature in the cylinder is very high. After igniting the oil and gas mixture, the temperature can be as high as 2000° to 2500°. In addition to the temperature, the pressure of the explosion after ignition is reached, reaching a temperature per square centimeter. 50 kg, after burning, will also produce chemicals such as lead, phosphorus, sulfur, etc., which will cause erosion of the electrode of the spark plug.
The spark plug generally consists of a center electrode, a side electrode, a threaded portion, an insulator, a spark plug shell, a joint, a gasket, and the like.
The center electrode is an electrode located at the center of the spark plug. The electric power from the high voltage wire is sent to this part and the spark is generated by the gap of the same side electrode. The electrodes of the high performance spark plug are precision machined and welded in platinum. In order to be able to quickly discharge a large amount of heat energy, some of the center electrodes of the spark plugs are also provided with electrode copper sheets inside the insulator.
Side electrode: The side electrode is an electrode connected to the threaded portion of the spark plug and is threadedly connected to the ground. The high-performance spark plug also cuts a very fine groove on the surface of the side electrode to make it more prone to sparks.
Threaded part: The threaded part is mainly used to fix the spark plug and support the side electrode, and also has a heat dissipation function. Different types of spark plugs or the same type of spark plugs are used on different engines with different thread diameters and thread lengths. Therefore, the same type of spark plugs will have a finer classification depending on the model.
Insulator: The insulator has both supporting properties and prevents leakage of electrical energy. In order to extend the insulation distance and reduce the influence of dust and moisture on the leakage between the joint and the spark plug shell, the insulator is designed to have a folded skirt shape.
Seal: The main function of the gasket is to seal the spark plug to the cylinder when the spark plug is tightened. When the same spark plug is repeatedly unscrewed, the sealing effect of the gasket will be weakened. The electrode part of the spark plug is the focus of use and maintenance.
The shape of the center electrode and the end of the side electrode and the gap formed between the two electrodes are important factors affecting the ignition of the spark plug. Therefore, when judging whether the spark plug can be used, first check whether the shape is intact, and check whether the gap is suitable. Generally, the thickness of the spark plug can be measured by the thickness gauge.
After introducing the structure of the spark plug, let's talk about the classification of the spark plug. The spark plug is divided into a cold spark plug and a hot spark plug. The two models have no good or bad points. Only the difference is not suitable for your own car. The specific choice depends on your own car. Instructions, the spark plug heat value will be marked when purchased, the higher the number is the cold spark plug, the lower the number is the hot spark plug.
Cold spark plug: The cold spark plug skirt is relatively short, the heat receiving area is small, and the spiral part has good heat dissipation. It is suitable for vehicles with high compression ratio and high rotational speed. If the vehicle has low compression ratio and low heat output, the cold type is used. The spark plug, the heat is not enough for the spark plug to reach the working temperature, it is easy for the spark plug to form carbon deposits.
Thermal spark plug: the opposite of the cold spark plug, the spark plug skirt is longer, the heat absorption is faster, the heat dissipation is also general, and the engine with low heat output and low compression ratio can maintain the normal working temperature without being too cold. If a cold-type spark plug is used in a car that has a carbon deposit and a high heat generation, the temperature may be too high to melt the spark plug electrode.
Spark plugs are consumables. Depending on the material, the number of kilometers used varies. The spark plug of the copper core can last for 20,000 to 30,000 kilometers. The spark plug of nickel alloy can last for 4 to 60,000 kilometers. The spark plug of platinum can last for 80,000. Kilometers, the spark plug of bismuth alloy can probably hold more than 100,000 kilometers. Of course, these data are not absolute. It depends on the use of the vehicle. If there is any problem, it should be replaced as soon as possible.
From the point of view of the use of the spark plug, it is possible to judge the running condition of the car.
The spark plug electrode is black, and there may be a phenomenon that the carbon deposit is too rich, the spark plug is too cold, the oil is burned, the fire is broken, and the like.
The spark plug electrode is white, and there is a phenomenon that the ablation phenomenon may be caused by excessive mixture of the mixture, overheating of the spark plug, and leakage of the spark plug.
Since the maintenance is now modular, basically no one has used a lighter to bake a spark plug, or a knife is used to scrape off the carbon. This "soil method" will be replaced directly in the repair, simple and clear way.
However, some merchants will let you change the spark plug. After the spark plug is replaced, the acceleration will be more fierce and the fuel consumption will be reduced. Please don't believe this kind of ghost, just tell him to change the original car.
If you change the spark plug in theory, it will improve in theory, but the upgrade is not big. When you ride a bicycle, it is not for competition. This is not a big change. If the competition is sure to change the complete ignition system.
According to the material, it is true that the spark plug of the sheet metal sticks to a long number of kilometers, but the price will increase accordingly, and the distance must be maintained according to the engine running condition, so the spark plug is selected according to its own situation.
Let's talk about the choice of the heat value of the spark plug. The higher the heat value of the spark plug, the stronger the heat dissipation. If the original car has a calorific value of 7, the riding habit is at the hand of the red zone, and at most, the spark plug with a calorific value of 8 can be selected. It is not appropriate to be taller. Don't blindly choose a spark plug with the same heat value as the large displacement. It will only damage your car, or you should choose the spark plug model that the specification requires.
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