How to Determine the Material of a Spark Plug?

[RichardMarie]

Distinguishing the material of a spark plug is done by examining the central core of the electrode. The specific method is as follows: a thicker core indicates a standard type; a thinner, white-colored core indicates platinum; and a thinner, yellow-colored core indicates iridium. What are the types of spark plugs: 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: Working principle of a spark plug: The ground electrode of the spark plug is connected to the metal shell, which is threaded into the engine block via the cylinder head. The insulator primarily serves to isolate the metal shell from the central electrode. The terminal nut is the part of the spark plug that contacts the high-voltage coil. When current passes through the terminal nut and the central electrode, it ionizes the medium between the central electrode and the ground electrode, generating a spark that ignites the air-fuel mixture in the cylinder.