Abstract: A spark plug with lower operating temperature has an electrode with a tip which evenly distributes heat imparted to the firing end portion of the spark plug. The electrical insulating material surrounding the electrode is spaced at a predetermined distance from the firing end portion of the spark plug to allow the heat to more quickly travel away from the firing end portion. An annular groove in the first end surface of the electrical insulating material minimizes electrical surface discharge between the electrode and the annular metal shell of the spark plug. Radii at locations of change in cross-section in the bore of the annular metal shell and the electrical insulating material serve to minimize voltage breakdown.

Abstract: In one aspect of the present invention, a sensor detects particles within a fluid. The sensor includes a housing that defines a cavity. A magnet is disposed adjacent the cavity bottom to attract particles into the cavity. A first coil is wound about the outer surface of the cavity. The induction of the first coil is responsive to the particle accumulation within the cavity. A second coil is wound about the magnet. The induction of the second coil is responsive to the temperature of the fluid and independent to the particle accumulation within the cavity.