| They final stroke in a four stroke cylinder engine during which the exhaust valve is open in the intake valve is closed, exhausting the combusted gases. | |
| The flow of current from a battery; to remove the refrigerant from an air-conditioning system. | |
| The proportion of air to fuel by weight in the mixture drawn into the engine. | |
| A shaft with eccentric lobes that controls the opening of the intake exhaust valves. |