Abstract: A spark plug cap is provided for use on a spark plug of an internal combustion engine to intensify sparking across the gap between central and ground electrodes of the plug. The spark plug cap includes a cap body which comprises upper and lower insulating body sections detachably interconnected together. The upper body section is provided with a terminal head adapted to be connected to an ignition current supply cord, while the lower body section with a connector socket for mechanically connecting the cap to the spark plug. A conductor rod extend through the cap body to electrically connect the terminal head with the center electrode of the spark plug. At least one capacitor unit is supported within the cap body and connected in parallel to the spark gap between the plug electrodes. The capacitor unit includes a cylindrical dielectric and a pair of electrodes positioned on the opposite end faces of the cylindrical dielectric.

Abstract: A spark plug cap for use on a spark plug of an internal combustion engine to much intensify sparking across the gap between central and ground electrodes of the spark plug. The spark plug cap includes an insulating body having a connector provided at its one end for mechanically connecting the cap to the spark plug. An electrical conductor extends through the insulating body for supplying high-tension ignition current to the central electrode of the spark plug. At least one capacitor unit is supported within the insulating body and electrically connected across the gap between the spark plug electrodes.