What is the Appropriate Torque for Spark Plugs?
1 Answers
For 12mm spark plugs, the generally applicable torque is 20 to 25 Nm, while for 14mm spark plugs, it is typically 25 to 30 Nm. What is a Spark Plug: A spark plug is a crucial component in the ignition system of a gasoline engine. It introduces high-voltage electricity into the combustion chamber, causing it to jump the electrode gap and generate a spark, thereby igniting the combustible air-fuel mixture in the cylinder. Components of a Spark Plug: A spark plug mainly consists of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. How a Spark Plug Works: 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 level, 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 becomes 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, sufficient to ignite the air-fuel mixture in the cylinder's combustion chamber.
