The difference between ordinary spark plugs and platinum spark plugs There are four differences between ordinary spark plugs and platinum spark plugs: 1. The materials used are not used 2. The service life is different 3. The price is different 4. The spark gap is different
1. The materials used are not
The material used for ordinary spark plugs is usually nickel alloy, which is an alloy composed of nickel as the base and other elements.
The material used in Perkin spark plugs is platinum, a naturally occurring white precious metal.
2. The service life is different
Ordinary spark plugs usually need to be replaced every 30,000 kilometers or so.
Perkin spark plugs last longer because they are more durable than ordinary spark plugs.
3. Different prices
Ordinary spark plugs are made of alloy, and the price is lower
Platinum spark plugs use the precious metal platinum, and the price is tens of yuan higher than ordinary spark plugs.
4. The spark gap is different
The spark gap of ordinary spark plugs is only 0.7-0.8mm.
The spark gap of the platinum spark plug is 1.1-1.5 mm, which makes a qualitative change in the performance of the spark plug.
Working principle of spark plug:
The electric board ignites the mixture gas in the cylinder through repeated and continuous power generation and ignition. At this time, other parts of the ignition system generate timing high-voltage electric pulses to form sparks and generate explosions to provide the energy required for engine power output.
The function of the spark plug is to introduce the high-voltage electricity (more than 10,000 volts) generated by the ignition coil into the engine cylinder, and generate sparks between the gaps of the spark plug electrodes to ignite the mixture. The working environment of the spark plug is extremely harsh. Take the spark plug of an ordinary four-stroke gasoline engine as an example. During the intake stroke, the temperature is only 60°C and the pressure is 90KPa; when it is ignited and burned, the temperature will instantly rise to 3000°C and the pressure will reach 4000KPa; The alternating frequency of rapid cooling and rapid heating is very high, which cannot be handled by ordinary materials, and the insulation performance must be guaranteed, so the requirements for the material of the spark plug are also very strict.
The spark plug is very small, and several of them can be placed in one pocket, but its structure is not simple. It has two parts: an insulator and a metal shell: the metal shell has threads for screwing into the cylinder; the insulator is installed in the shell, and a center electrode runs through it, and there is a wire nut on the upper end of the center electrode, which is connected from The high-voltage wires coming from the distribution board; the ground electrode is welded on the lower end of the shell, and there is a gap of 0.6-1.0mm between the center electrode and the ground electrode. When the high-voltage electricity passes through this gap and enters the ground, sparks will burst out and the mixture will be ignited. .
The key part of the spark plug is the insulator. If the insulator does not work, the high voltage will "take a small path" instead of entering the ground through the two poles, resulting in no spark. The insulator of the spark plug must have good mechanical properties, high voltage resistance, high temperature impact resistance, and chemical corrosion resistance. Ordinary spark plugs are mostly made of alumina-based ceramics. The size of the spark plug is uniform all over the world, and it can be used in any car. However, due to the difference in the type of gasoline engine, there are two basic types of spark plugs, cold type and hot type. The cold type and the hot type are relative terms, which reflect the thermal characteristics of the spark plug. The spark plug must have a proper temperature to work well, and no carbon deposits to work properly. Practice has proved that when the spark plug insulator is kept at a temperature of 500-600 ° C, the oil droplets falling on the insulator can be burned immediately without forming carbon deposits. If the temperature is higher than this temperature, it will burn early, and if the temperature is lower than this temperature, there will be carbon deposits. The temperature on different engines will be different, and the designer uses the length of the insulator skirt to solve this contradiction. Some skirts are short and have a small heating area and fast heat dissipation, so the temperature of the skirt is lower. They are called cold spark plugs, which are suitable for high-power engines with high speed and high compression ratio; The higher the temperature, it is called a hot spark plug, which is suitable for low-power engines with medium and low speeds and low compression ratios. What kind of spark plugs are used in your own car should be selected according to the manufacturer's specified model, not all spark plugs are suitable.
