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Multi-Ground

Some engine designs require the spark plugs have the ground electrode placed to the side of the center electrode rather than below as on a traditional plug. This may be for combustion chamber design as in the case of a rotary engine, or a surface gap design as used in leaner air/fuel ratio’s on industrial engines.

 

The side electrode design tends to wear faster than a traditional plug. Erosion at these points creates a larger gap between the center and ground electrodes, causing plug misfire. Thus, if the engine design requires a side discharge plug, more ground electrodes extend plug life.  Multi-Ground plugs are offered in 2, 3 and 4 ground electrode designs.


It is important to note that multi-ground does not mean multi-spark, there will still only be one spark at a time.

 

Caution should be made in selecting a "high performance" plug.  If your car came OE with a multi-ground plug, your engine will likely wear through single electrode plugs, especially fine wire plugs, at a rapid rate.

 


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