| The proportion of air to fuel by weight in the mixture drawn into the engine. | |
| A device attached to a mechanically driven cooling fan that allows the fan to freewheel when the engine is cold and the vehicle is driven at speed. | |
| Electric current that flows in one direction | |
| Connects the engine to the transmission and encloses the clutch assembly. It also provides mounting points for part of the clutch release mechanism. |