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Abstract

An internal combustion engine includes a cylinder head and a spark plug assembly adapted to be received in a cylinder head bore. The spark plug assembly includes a metal ground electrode element having an annulus disposed on a transverse annular seat of the cylinder head bore and a ground side electrode extending from the annulus. The ground side electrode is received in an axial slot of the cylinder head bore between the seat and a cylinder head inner wall and protrudes into the combustion chamber. The orientation of the ground electrode relative to the cylinder head, and thus to the geometry of the combustion chamber, is established by the circumferential location of the axial slot relative to the bore. The spark plug assembly also includes a center electrode element having a center electrode and surrounding insulator body. The insulator body includes a shoulder that is clamped against the ground electrode annulus on the seat by a spanner retainer nut threaded into the cylinder head bore about the insulator body. The ground electrode element and the center electrode element are thereby secured in position in the cylinder head bore.

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First Claim