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Lombardini Unit Injector System:

 
  • This illustration shows the overhead cam, rocker arms, valves, injector pump, injector, pre-combustion chamber, glow plug, and piston.  Click here to see photo
The injection equipment consists of unit injectors fitted on each cylinder of the engine. The pumping element of the unit injector is provided with a one-way feeding system.

The figure shows the unit injector layout of the FOCS engine series. This new type of unit injector is shaped at an 85° angle, so that the injector nozzle matches the top face of the precombustion chamber slightly inclined and the pumping element lies flat over the camshaft. This layout keeps the height of the engine to a minimum.

The elimination of high pressure fuel pipes, together with delivery valve
optimization, keeps the injection timing constant throughout the entire range of operating speed.