Is It Normal for the Bottom of a Spark Plug to Appear Red?

[Noelle]

It is normal for the bottom of a spark plug to appear red. The spark plug is a critical component of a gasoline engine's ignition system, which introduces high-voltage electricity into the combustion chamber and causes it to jump across the electrode gap to generate a spark, thereby igniting the combustible air-fuel mixture in the cylinder. It consists of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. The principle of the spark plug: Under high voltage, the air between the center electrode and the side electrode rapidly ionizes, forming positively charged ions and negatively charged free electrons. Types of spark plugs: 1. Standard spark plugs; 2. Insulator-protruding spark plugs; 3. Electrode-type spark plugs.