| The lower part of an engine block that houses the crankshaft. | |
| The proportion of air to fuel by weight in the mixture drawn into the engine. | |
| A set of different size gears incorporated in one casting, used in a manual transmission. | |
| A master cylinder that has one cylinder bore, but two pistons into fluid reservoirs. Each piston applies hydraulic pressure to two wheels only. In the event one of the hydraulic circuit fails, the other provides enough breaking power do you stop the vehicles. |