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On the cylinder head. The dimension of the hexagon thread of the shell has been included in the ISO international standard. The spark plug electrode includes the center electrode and the side electrode, and the spark gap is between them. The gap directly affects the starting, power, stability and economy of the engine. The reasonable gap is related to ignition voltage. Electrode materials must have good resistance to electric erosion (spark erosion) and corrosion (chemical thermal corrosion), and good thermal conductivity. Between the central electrode and the connecting screw is the conductor glass sealant, which can not only conduct electricity, but also bear the high pressure of mixture combustion, and ensure its tightness.
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