How to choose a spark plug for a car? How to buy spark plugs for automobiles?

The spark plug, commonly known as the nozzle, is used to discharge the pulse high-voltage electric discharge from the high-voltage wire (nozzle wire), break through the air between the two electrodes of the spark plug, and generate an electric spark to induce the mixed gas in the cylinder. So for different cars, how to choose a spark plug?

Car spark plug purchase tips.

1. Spark plug size.

Replace the spark plug must choose the size of the vehicle that suits you, the length and diameter should match, if you buy the wrong model can not be installed, even if you can install it, the slight difference in size will also have a negative impact on the performance, and the engine will be damaged in serious cases. Each spark plug is printed with its designation, and the second letter in the string of characters represents the size of the spark plug, which includes both the diameter and length of the thread.

2. Spark plug thread diameter.

There are three main thread diameters of 10mm, 12mm and 14mm, in the models on sale in China, 14mm is the most mainstream size, but as the engine design becomes more and more compact, all kinds of parts will also be mini, spark plugs are no exception, the trend of getting smaller and thinner has been set, and the spark plugs with thinner diameters such as 10mm and 12mm will become the mainstream in the future.

3. Spark plug thread length.

The length of the thread, many friends also commonly call it "tooth length", there are many models in the list, but for ordinary users to remember these models is too difficult, and there is not much meaning, just remember what size of spark plug your car requires to be replaced.

4. Calorific value. The calorific value parameter is also very important, the most popular explanation is the heat dissipation capacity of the spark plug itself, but different manufacturers have different naming rules for the calorific value of the spark plug, so it can not be summarized as the calorific value "high" or "low", it can be simply divided into the "cold" spark plug with good heat dissipation capacity and the "hot" spark plug suitable for low-speed engines. For example, the higher the value of the champion spark plug, the more inclined the spark plug is to be "hot", while the higher the value of the NGK spark plug, the higher the value means that the month is more inclined to the "cold type".

When purchasing spark plugs, you must choose according to the calorific value that matches the vehicle, if the choice does not match, it will affect the performance of the engine.

The method of selecting the spark plug is: 1. The size of the spark plug, what type of spark plug is used in the engine, what model is selected; 2. The calorific value of the spark plug, the hot type spark plug is suitable for low-speed engines, while the cold type is suitable for high-speed engines; 3. The material of the spark plug can be equal to or higher than the original material; 4. Spark plug structure, you can choose the type of spark plug suitable for you according to the situation of the car and personal conditions. The spark plug is an important element of the ignition system of a gasoline engine, which can introduce high-voltage electricity into the combustion chamber and cause it to skip the electrode gap to generate a spark, thereby igniting the combustible mixture in the gas cylinder.

The spark plug is mainly composed of a wiring nut, an insulator, a wiring screw, a central electrode, a side electrode, and a shell.

Choose the right one according to the model of the car, and choose the best. Theoretically, the life of nickel alloy spark plugs is 20,000 kilometers, that of platinum spark plugs is 40,000 kilometers, that of iridium spark plugs is 6-80,000 kilometers, and that of double iridium and iridium platinum can be as long as 100,000 kilometers.

Is it true that car spark plugs are more expensive and higher? How to choose the best spark plug.

The types of spark plugs can be divided into nickel alloy spark plugs, platinum spark plugs and iridium spark plugs according to the shape: quasi-type spark plugs, electrode type spark plugs, edge body protruding spark plugs, seat type spark plugs, and surface jumping fire type spark plugs can be divided into the following according to the calorific value

Cold spark plugs and hot spark plugs (extreme ignition iridium spark plugs, fuel saving more than 10%, better in terms of automobile fuel consumption).

The spark plug must be used in conjunction with the engine, and cannot be used indiscriminately or generically. The short skirt length of the spark plug is called the cold spark plug, which is suitable for high-speed and high-compression ratio high-power engines; The ones with longer skirts are called hot spark plugs and are suitable for low-power engines with low to medium speeds and low compression ratios.

1. The material of the electrode determines the service life of the spark plug.

There are many common spark plug electrode materials, and the electrode materials of different materials determine the service life of the spark plug.

Common materials are nickel alloys, silver alloys, platinum, iridium, iridium platinum, and so on. The corresponding service life is: nickel alloy 2-3 life of 10,000 kilometers, this spark plug performance is average, relatively ordinary, but the price is very low, cheap more than a dozen yuan.

Platinum spark plugs can be replaced in 3-50,000 kilometers, double platinum can be used for about 80,000 kilometers, and iridium spark plugs can be used for about 100,000 kilometers.

Second, how to choose a spark plug.

1. Choose spark plugs for more engine models. Each engine model is different, the matching spark plug is not the same, when buying a spark plug, pay attention to the size and model of the spark plug. 2. Select the spark plug with the corresponding calorific value according to the engine power.

In layman's terms, engines with different speeds, different powers, and different compression ratios are suitable for choosing matching spark plugs.

3. When will the spark plug be replaced, the mileage is a reference, and the other is to find that the engine has a lack of fire and leakage, and it is also necessary to rule out whether the spark plug should be replaced. If the engine has a knock, carbon deposition increases, and fuel consumption increases, you can also check to see if it is a spark plug problem. It should be noted that the spark plug replacement must use a torque wrench to achieve the specified torque, rather than many auto repair shops can directly tighten it.

There are many common brands of spark plugs, Bosch, NGK, Denso, Champion, etc., how should we choose, this can be based on the actual use of your car, and the performance of the same price is not much different. The main basis is to recommend more reference to the maintenance manual.

Replace the spark plug must choose the size of their own vehicle, the length and diameter of the sail ant and match, this is actually needless to say how to judge, if the model bought is not right, it can not be installed, even if it can be installed, the slight difference in size will also have a negative impact on the performance, and the engine will be damaged in serious cases. Mono-pie

Each spark plug is stamped with its designation, and the second letter in the string of characters represents the size of the spark plug, which includes both the diameter and length of the thread.

Precautions for automotive spark plugs.

It should be noted that when replacing a new spark plug, attention should be paid to comparing the length of the external threads of the new and old spark plugs. If the thread of a new spark plug is too short, the spark plug gap will be located in the recessed cylinder head, and the arc will be difficult or even impossible to ignite the mixture.

If it is too long, the overexposed bottom of the spark plug will overheat, causing pre-ignition, and the threads protruding into the combustion chamber will accumulate carbon, and the end of the spark plug may even hit the piston top. Some models have seals, while others do not. If the old spark plug that was unscrewed has a seal, then the new replacement spark plug should also be fitted with a seal.

Hello 1Choose the same size of the spark plug to replace the spark plug must choose the size that suits your vehicle, the length and diameter to match, this is actually needless to say how to judge, if the model you buy is not right, you can't install it, even if you can install it.

The selection of spark plug thread diameter should be consistent There are three main thread diameters of 10mm, 12mm and 14mm, among the models on sale in China, 14mm is the most mainstream size, but with the engine design more and more compact.

The length of the spark plug thread should be the same In addition, there is an important size is the length of the thread, many friends also commonly call it "tooth length", and there are many models in the list, but it is too difficult for ordinary users to remember these models.

The choice of spark plug calorific value should be reasonable, and the heat value of this wheel is also very important, and the most popular explanation is the heat dissipation capacity of the spark plug itself, but different manufacturers have different naming rules for the calorific value of spark plugs.

Replace the spark plug must choose the size that suits their vehicle, the length and diameter should match, if the model bought is not right, it can not be installed, even if it can be installed, the slight difference in size will also have a negative impact on the performance, and the engine will be damaged in serious cases. Each spark plug is printed with its Jingqing designation, and the second letter in the string of characters represents the size of the spark plug, which includes both the diameter and length of the thread.

Because spark plugs are worn parts, it is very common to replace spark plugs during car repairs. So how should we choose a spark plug?

Now the common spark plugs on the market are nickel alloy, platinum, iridium, iridium platinum and other materials, ranging from more than a dozen to hundreds. Due to different materials, the service life of spark plugs is between 20,000 km and 50,000 km, as shown in the figure:

Because every car has the same engine model, so do the matching spark plugs. When choosing a spark plug, it is very important to buy the model and size of the spark plug. Of course, this juxtaposition is a perfect match for the product brand.

In general, each spark plug is printed with its model number. Usually, the second letter in this string represents the size of the spark plug. Figure:

Secondly, the spark plug corresponding to the calorific value should be selected according to the engine power, that is, the engine with different speeds, different powers, and different compression ratios should choose the matching spark plug. The heat generation of a spark plug actually refers to an indicator of heat generation and heat dissipation. The heat emitted by the spark plug itself is called calorific value, which can also be understood as a parameter that represents the heat dissipation capacity of the spark plug.

The calorific value has an impact on a vehicle's fuel consumption, engine knock and horsepower. If it is too cold, not only will fuel be consumed, but the combustion chamber is prone to carbon deposits. If it's too hot, it can knock, lack of power, and overheat the engine.

The higher the calorific value, the faster the heat dissipation, the lower the spark plug temperature, and the more carbon deposits at the ignition site. However, if the heat generation is too low and the heat dissipation is sufficient, the spark plug temperature will be very high, which will lead to deflagration, etc. It is easy to burn out spark plug ceramics, dissolving electrodes, etc.

Therefore, the heat generation of the spark plug cannot be arbitrarily selected.

So how do we choose the calorific value of the spark plug? Generally speaking, a car that runs fast requires a spark plug with a high calorific value, while a large car that runs slowly requires a spark plug with a low calorific value. However, our common method of identifying calorific value is different between Bosch and NGK.

Generally speaking, the engines of our family cars basically use spark plugs with medium calorific value. Taking NGK spark plugs as an example, the model number of spark plugs for family cars generally shows a calorific value of . Of course, when replacing a spark plug, it is most reasonable to find the heat generation that matches the overall condition of the car engine.

Car owners can inquire according to the disassembled spark plug model, or they can inquire and purchase through the 4S store or car manual. If you buy the wrong model, you can't fit it. Even if it can be used casually, due to this subtle difference, the performance of the silver car will be greatly reduced, and even failures such as increased fuel consumption, poor acceleration, and engine damage will occur.

So choosing the right spark plug is very important.

Millions of car purchase subsidies.

The spark plug, commonly known as the fire nozzle, is used to discharge the pulse high-voltage electric discharge from the high-voltage wire, break through the air between the two electro-hydraulic poles of the spark plug, and generate an electric spark to induce the mixed gas in the cylinder. The main types are: quasi-type spark plugs, edge body protruding spark plugs, electrode type spark plugs, seat type spark plugs, polar type spark plugs, surface jump fire type spark plugs, etc.

The function of the spark plug is to introduce tens of thousands of volts of high-voltage electricity into the combustion chamber, and generate an electric spark to ignite the mixture, and cooperate with the ignition system and the oil supply system to make the engine work, to a large extent, the performance of the common motive.

The main species. According to the calorific value, there are cold type and hot type; According to the electrode material, there are nickel alloys, silver alloys and platinum alloys; If you are more professional, the types of spark plugs are generally as follows:

1. Quasi-type spark plug: the skirt of the insulator is slightly retracted into the end face of the shell, and the side electrode is outside the end face of the shell, which is the most widely used.

2. Spark plug with protruding edge: the skirt of the insulator is long, protruding beyond the end face of the shell. It has the advantages of large heat absorption, good anti-fouling ability, etc., and can be directly cooled by the intake air to reduce the temperature, so it is not easy to cause hot spot fire, so the thermal adaptation range is wide.

3. Electrode spark plug: its electrode is very thin, characterized by strong sparks, good ignition ability, and can ensure that the engine is fast and reliable in the cold season.

Starting, wide thermal range, can meet a variety of purposes.

4. Seat-type spark plug: its shell and screw-in thread are made into a cone, so it can maintain a good seal without a washer, thereby reducing the volume of the spark plug and making it more beneficial to the design of the engine.

5. Polar spark plug: the side electrode is generally two or more than two, the advantage is that the ignition is reliable, and the gap does not need to be adjusted frequently, so it is often used in some gasoline engines where the electrode is easy to ablate and the spark plug gap can not be adjusted frequently.

6. Surface skip type spark plug: that is, along the surface gap type, it is the coldest type of spark plug, and the gap between the central electrode and the end face of the shell is concentric.

In addition, in order to suppress radio interference from the ignition system of automobiles, resistive and shielded spark plugs are produced. The resistive spark plug is equipped with 5-10 ceramic resistors in the spark plug, and the shielded spark plug is to use the metal shell to shield and seal the entire spark plug. Shielded spark plugs.

It can not only prevent radio interference, but also can be used in waterproof and explosion-proof occasions.