Spark plug having an encapsulated center firing electrode gap

A spark ignited gaseous fueled power system, comprising:

• an engine head having a spark plug well having first and second ends and a length of at least 25 centimeters;
• an engine block having a piston, a piston cylinder, and a combustion chamber defined by said piston, piston cylinder, and said second end of said spark plug well;
• a plurality of valves means for the intake and exhaust of gases from the combustion chamber;
• a spark plug having a shell, an insulator, a center electrode, a ground electrode, and a capsule, said insulator being fixedly held in the shell, extending about and through said shell and at least 5.2 centimeters beyond said shell, said electrodes being spaced one from the other and defining an electrode gap therebetween, said capsule having an ignition chamber and an orifice system for the controlled exchange of gases into and from the ignition chamber, said capsule being connected to the spark plug shell, surrounding said electrode gap, and being substantially centered within said combustion chamber, said orifice system having a plurality of orifices of a size, orientation and position adapted for the entry of gases through the orifices, into the ignition chamber, and along a swirling pathway around the electrode gap, said orifices being positioned within said engine block combustion chamber;
• an insulated spark plug extender connected to said spark plug and extending toward the first end of said spark plug well;
• a power source adapted to deliver at least 8000 volts and being connected to the spark plug extender;
• and
• means for controllably delivering fuel gas into the combustion chamber.