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14mm Thread Size, 21.5mm (.846") Reach, 13/16" (20.6mm) Hex Size, Gasket Seat, Non-Resistor, Surface Gap, Heat Range 29
Surface gap plugs have no ground electrode attached to the steel shell to project toward the center electrode. Rather the outside steel shell itself acts as the ground, removing all chance of plug induced pre-ignition. Typically used in only the most extreme combustion chamber conditions and typically for cold application, the firing tip is nearly impervious to pre-ignition, however, fouling deposits can be problematic. These plugs have limited use in racing or marine use and typically require a capacitor discharged ignition systems (CDI). Some industrial applications also can require surface gap plugs (such as for extended low RPM or idle situations). Copper core for better thermal conductivity. Machine rolled threads to reduce cross-threading and seizing . The plug insulator is constructed of purified alumina powder for extreme stress with 5 ribs to prevent flashover. |
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= regular class
