SPARK PLUG
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United States of America Patent
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Issued Date -
Jun 25, 2015
app pub date -
Jul 11, 2013
filing date -
Jul 25, 2012
priority date (Note) -
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Abstract
A spark plug may include a shell surrounding a lower part of an insulator. The shell may be provided with a tool engaging portion, a seal face configured to contact a corresponding seal of a cylinder head of an internal combustion engine, a cylinder engaging threaded portion having a thread diameter (D) configured to screw the spark plug in a threaded bore of the cylinder head, and an intermediate portion extending between the shoulder and the cylinder engaging threaded portion. The intermediate portion may have a length (L1), wherein: 0.20<=L1/D<=0.80 and L1 is the length and D is the thread diameter.
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