Unit injector
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A unit injector (UI) is a high-pressure integrated direct fuel injection system for diesel engines, combining the injector nozzle and the injection pump in a single component. The plunger pump used is usually driven by a shared camshaft. In a unit injector, the device is typically lubricated and cooled by the fuel itself.
Early Lucas electronic diesel unit injector
Napier Deltic opposed-piston two-stroke, sectioned. The unit injectors are low down, below the yellow fuel passages, driven by a camshaft to their left and injecting into the centre of the cylinder liner (pale blue).
Delphi E1 UI on the Volvo D13A engine
Delphi E1 unit injector parts
Fuel injection
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Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines.
A cutaway model of a petrol direct-injected engine
Air-blast injection system for an 1898 diesel engine
Mechanical port injection system on a 1906 Antoinette 8V engine
1950s Rochester Ramjet mechanical port injection system (on a Chevrolet 283 engine)