Abstract: An ignitor (118) comprises a body portion (120) connected with an electrical supply cable (122) and an electrode portion (124) removably mounted within the body portion (120). The body portion (120) includes a capacitor defined by an outer, electrically conductive shell (126) of the body portion, and an inner, tubular capacitor plate (134). The inner, tubular capacitor plate (134) is held within the body portion (120) by means of a connector assembly (132) which is held in place by a dielectric potting compound (136).

Abstract: An ignitor (10) for initiation combustion of fuel in an internal combustion engine includes a body portion (12) and a removable electrode portion (14) to permit replacement or repair of the electrodes, so that current is delivered to one of the electrodes (72) along a path through each of the capacitive elements. The body portion includes a pair of capacitive elements defined by longitudinally spaced, radially extending, annular capacitor plates (60, 62, 64, 66) which surround the central electrode (26, 72). The body portion includes an outer, cylindrical shell (16) which is insulated from the capacitive elements by layers (40, 42) of high dielectric material.