. "hot bulb engine" . "Hot-bulb" . "Hot bulb engine" . "Hot-bulb engine" . . . . . . . . . "Akroyd engine" . . "Akroyd (hot-bulb)" . . . . . . . "hot-bulb engine" . "Hot-bulb ignition" . "hot-bulb" . "Hot-bulb engine" . . "semi-diesel engine" . . "Hot-bulb injection" .