Do Diesel Cars Have Spark Plugs?

1 Answers
Lynn
07/30/25 12:03am
Diesel engine vehicles utilize compression ignition, which means they do not have spark plugs, unlike gasoline-powered vehicles. During operation, air enters the cylinder in a diesel engine. When the air inside the cylinder is compressed to its limit, the temperature can reach 500-700°C, causing the mixture of air and diesel fuel to auto-ignite at the ignition point. Composition of Spark Plugs: Spark plugs mainly consist of a terminal nut, insulator, terminal stud, center electrode, side electrode, and metal shell. Main Types of Spark Plugs: Standard spark plugs, projected insulator spark plugs, electrode-type spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs. Working Principle of Spark Plugs: The ground electrode of a 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 center 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 center electrode, it ionizes the medium between the center electrode and ground electrode, generating a spark to ignite the air-fuel mixture in the cylinder.
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