Have you ever wondered what’s inside a spark plug and how it functions? Join us on an animated journey as we explore the inner workings of this essential component of an engine. In this educational video, we take a closer look at the external and internal components of a spark plug and unravel the process of spark formation.
source.image(PrtSc): Owls Eye Animation Studio
The function of a spark plug is to produce a spark at the required time to ignite the combustible mixture. The plug is connected to the high voltage generated by an ignition coil or magneto. As current flows from the coil, a voltage develops between the central and side electrodes. Initially no current can flow because the fuel and air in the gap is an insulator, but as the voltage rises further it begins to change the structure of the gases between the electrodes. Watch the video from Owls Eye Animation Studio:
Once the voltage exceeds the dielectric strength of the gases, the gases become ionized. The ionized gas becomes a conductor and allows current to flow across the gap. Spark plugs usually require voltage of 12,000–25,000 volts or more to “fire” properly, although it can go up to 45,000 volts. They supply higher current during the discharge process, resulting in a hotter and longer-duration spark.
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As the current of electrons surges across the gap, it raises the temperature of the spark channel to 60,000 K. The intense heat in the spark channel causes the ionized gas to expand very quickly, like a small explosion. This is the “click” heard when observing a spark, similar to lightning and thunder. Each part of the spark plug plays a crucial role in igniting the fuel-air mixture within the engine’s cylinders, from the electrode to the insulator. With detailed animations and clear explanations, you’ll gain a better understanding of how a spark plug generates the spark that powers your vehicle.
