Most of us just take the new spark plug out of the box, gap it and install it in the old plug location and then tighten to factory torque specifications. But, there are some applications in which you need to index the plug.

Spark plug indexing is the orientation or placement of the ground electrode at a specified direction in the combustion chamber. An engine manufacturer or builder might specify a ground electrode orientation for several reasons, including performance, efficiency, clearance or fouling prevention.

Counterman Magazine: [ Ссылка ]

The Group Training Academy: [ Ссылка ]

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