The type and function of the automobile's spark plug

1. Nickel alloy spark plug 

It is the lowest quality spark plug. The performance of high-end models can not keep up at all. It is only suitable for low-end models. Many low-end original spark plugs are made of nickel alloy, with a life cycle of 1-2W km.

2. Iridium spark plug

This is now the most mainstream high-efficiency spark plug. Its performance and effect will be better than the original one, so it is also called enhanced iridium spark plug. The stability is the best at present, with a life cycle of 6W km.

3. Platinum spark plug

This is a moderate fire return plug, and its performance is basically the same as that of iridium. But the service life will be a little higher, usually 5-8w km.

4. Iridium platinum plug

 This is the best material of unipolar spark plug A. its performance basically exceeds that of iridium and platinum, also known as double iridium. Its stability will be more outstanding than that of platinum. At the same time, its service life is the longest of the four materials, up to 10W km.

All gasoline engines have spark plugs, one for each cylinder. Individual high-speed gasoline engines are also equipped with two spark plugs per cylinder. Although the spark plug is only a small part, it is extremely important. Without it, the engine will not move. Anyone who often Zhidao drives will be familiar with this thing. Spark plug is a relatively cheap automobile vulnerable part, but many people do not know that spark plug plays a very important role in the operation of the engine. It is related to the fuel saving, quiet and other conditions of the automobile. Maintaining the spark plug will surprise you.
The function of the spark plug is to introduce the high-voltage electricity (more than 10000 volts) generated by the ignition coil into the engine cylinder, generate sparks between the electrode gaps of the spark plug and ignite the mixture. The working environment of spark plug is extremely bad. Taking the spark plug of an ordinary four stroke gasoline engine as an example, the temperature is only 60 ℃ and the pressure is 90kpa during the intake stroke; During ignition and combustion, the temperature will rise to 3000 ℃ and the pressure will reach 4000kpa; The alternating frequency of rapid cooling and heating is very high, which can not be handled by ordinary materials. It is also necessary to ensure the insulation performance. Therefore, the material requirements for spark plugs are very strict.