fuel injection system

fuel injection system

A form of fuel metering system for a reciprocating engine that injects the fuel directly into the cylinder, rather than mixing it with the air before it is taken in through the intake valve. There are two types of fuel injection systems in use, the direct injection system and the continuous-flow injection system.

The direct injection system, such as is used in a diesel engine, sprays the fuel into the cylinder under high pressure. The fuel is atomized by the spray for better combustion.

The continuous-flow fuel injection system used on many of the modern horizontally opposed aircraft engines is not a true injection system. It meters the fuel and delivers it under a low pressure to the outside of the intake valve. This fuel, along with the necessary air for combustion, is pulled into the cylinder when the intake valve opens.

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