An internal combustion engine providing a strong mounting attachment for an engine accessory component on a light weight element of the engine body that is provided with a reinforcement for another primary purpose. The upper section of the FED includes a faceplate. The discharge vessel gastightly encloses a discharge space into which said two electrodes extend from the end part and which contains an ionizable filling. The device may include a motor andor a spring or springs to drive the arms towards or away from each other.