| Part of the distributor ignition system that triggers the spark and directs it through the wires to the spark plugs. | |
| In a manual transmission, part of the synchronizer assembly. A brass ring that brings the driven gear to shaft speed before engagement. | |
| Device to produce a flow of air at higher then atmospheric pressure. Normally referred to as a Thermactor air supply pump. | |
| A mechanical or electrical driven propeller that draws air through the radiator. |