Patent ID: 6882092

Claim:
A spark plug for the controlled burning of a fuel/air mixture at a defined burn zone within a combustion chamber in the cylinder of an internal combustion engine comprising: an elongated electronically non-conductive body; an ignitor electrode supported by said non-conductive body and having a distal tip extending into said burn zone; an elongated conductive body surrounding said non-conductive body and having a horn nozzle immediately adjacent said tip in spaced-apart relationship; at least one post joining said horn nozzle with said conductive body and to hold said horn nozzle in spaced-apart relationship with respect to said conductive body to define said burn zone; vent slots provided in said burn zone by said posts for exhausting gasses therethrough exteriorly of said horn nozzle; said horn nozzle is circular having a conical inner side wall terminating adjacent said tip in a reduced throat diameter and terminating exteriorly with an enlarged mouth of greater diameter than the diameter of said throat diameter; said side wall constituting an open-ended flared frustum-conical passageway having a curved surface in transverse cross section; said distal tip of said ignitor electrode is spherical and resides within said throat of said horn nozzle defining an annular linear entrance leading into said throat; and said ignitor electrode bendable for adjustment with respect to distance from said horn nozzle with said throat.