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Why is the firing end appearance of a spark plug important?

لي لي چنيو / hcfire360 طرفان نومبر

A Because the firing end appearance reflects the suitability of the spark plug as well as the condition of the engine.

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These are the three basic standards for evaluating a spark plug.
Spark plug tip temperature and firing end appearance

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The border-line between the fouling and optimum operating regions (500 °C) is called the spark plug self-cleaning temperature.
It is at this temperature that accumulated carbon deposits are burnt off.