 printable version
Spark plug
Spark plug comprises a central electrode, a ceramic insulator with the housing and the electrode mass. Spark ignited fuel-air mixture, slips between the central electrode and the electrode mass. It is not recommended to deviate from the prescribed types of candles, which, among other things, is also determined by heat range.
Heat rating indicates the degree of the maximum allowable thermal load a spark plug. With a decrease in the glow of increased allowable thermal stress. In this case, improved heat dissipation from the candle, thereby reducing the risk of pre-ignition (engine operation after the ignition is switched off). The main disadvantage of candles with a high thermal load is permissible that the temperature of the self-cleaning candle as high. In this case, the working part of the candle is covered with deposits, particularly when the engine is not warmed up while running at normal operating temperature.
Heat range spark specified car manufacturer. Candles are different from each other by one or more side electrodes, and the diameter and length of the thread, so the normal operation of the engine the spark must be used only as prescribed by the manufacturer.
The service life of spark is mainly determined by the electrode material. The electrodes of nickel-chromium alloys have high thermal conductivity and high corrosion resistance. The use of silver for maximum heat conductivity. The electrodes are made of platinum have the highest quality and corrosion resistance to fading. Lifetime candle depends on the material used and the design of the electrodes of the spark plugs and is 20 000 to 100 000 km.
Design uses two kinds of seals between the spark plug and cylinder head.
If you have a flat sealing surface on the candle has a removable outer sealing ring. If the candle has a conical shape seal, it does not require additional sealing ring. In connection with the reduction in size of the engine using spark plugs with a flat seal and reduced in size by a key or a candle with a conical seal.
|
