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Within an internal combustion engine (including a rotary engine), an apparatus and method for the pre-combustion of a rich fuel mixture within a spark plug to ignite a leaner fuel mixture within the cylinder. Substantially undiluted gaseous pilot fuel is supplied by a unidirectional valve through an

Within an internal combustion engine (including a rotary engine), an apparatus and method for the pre-combustion of a rich fuel mixture within a spark plug to ignite a leaner fuel mixture within the cylinder. Substantially undiluted gaseous pilot fuel is supplied by a unidirectional valve through an integral passageway within the spark plug to a pre-combustion chamber recessed within the ignition end of the spark plug. The pilot fuel is supplied to the pre-combustion chamber during the downstroke of the piston. During the upstroke of the piston, lean cylinder gases are compressed into the pre-combustion chamber, mixing with the pilot fuel to yield a combustible mixture. Controlled electric ignition of the mixture within the pre-combustion chamber sends a flame jet into the leaner fuel mixture producing timed combustion within the cylinder.

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A pre-combustion chamber spark plug for igniting a gaseous fuel mixed with air to form a resulting combustible mixture within the spark plug, whereby a leaner fuel mixture within an adjacent cylinder of an internal combustion engine can be ignited comprising: (a) a spark plug body defining a recess

A pre-combustion chamber spark plug for igniting a gaseous fuel mixed with air to form a resulting combustible mixture within the spark plug, whereby a leaner fuel mixture within an adjacent cylinder of an internal combustion engine can be ignited comprising: (a) a spark plug body defining a recess axially located at an open end and a closed end defining a fuel passageway therethrough to carry gaseous fuel to said recess for ignition; (b) an axially located first electrode extending through said plug body and adjacent to said recess and extending into the adjacent cylinder of the engine; (c) a second electrode located a distance away from said first electrode and extending into the adjacent cylinder of the engine, adjacent to said recess, wherein said passageway allows gaseous fuel to flow into said recess due to a decrease in relative pressure within the adjacent cylinder of the internal combustion engine, wherein air residing within the cylinder can flow into said recess forming the combustible mixture which can be ignited by an electrical potential between said first and second electrodes causing a spark, wherein the combustible mixture is ignited at said open end of said recess to subsequently ignite the leaner fuel mixture in the rest of the cylinder.