What do the letters and numbers on spark plugs represent?
1 Answers
Letters indicate the structure, type, and main dimensions of the spark plug, while numbers represent the heat value of the spark plug. What is a spark plug composed of: A spark plug mainly consists of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. What types of spark plugs are there: The main types of spark plugs include: standard spark plugs, projected insulator spark plugs, electrode spark plugs, seat spark plugs, pole spark plugs, and surface gap spark plugs. How does a spark plug work: Under high voltage, the air between the center electrode and the side electrode of the spark plug rapidly ionizes, forming positively charged ions and negatively charged free electrons. When the voltage between the electrodes reaches a certain value, the number of ions and electrons in the gas increases like an avalanche, causing the air to lose its insulating properties and forming a discharge channel, resulting in a "breakdown" phenomenon. At this point, the gas forms a luminous body, known as a "spark." Along with the thermal expansion, a "crackling" sound is also produced. The temperature of this electric spark can reach as high as 2000-3000°C, which is sufficient to ignite the air-fuel mixture in the combustion chamber of the cylinder.
