New EUI from Delphi

Delphi Automotive Systems
Delphi Automotive Systems has developed a new electronic unit injector (EUI) for large diesel engines between nine and 16 litres.
The company says the new EUI can provide greater flexibility in cylinder head packaging by directly replacing previous generation injectors. It is also said to improve peak injection pressure and injector responsiveness, and it is half the weight of previous designs, saving 14.5 lbs. on a six-cylinder engine.

EUI systems use a separate pump for each injector, traditionally integrating the pump with the injector body, and mounting the spill valve and control solenoid on the side of the body. The company also said that new technology allows the spill valve and control solenoid to be integrated within the injector body, concentric with the pump and nozzle mechanisms. This provides for a compact unit which, compared with the previous generation EUI, is no larger than the conventional injector body alone and uses 40 percent fewer components.

According to Delphi, the shorter, more direct fuel path allows for more accurate fuel metering, improved injector responsiveness and a peak injection pressure that is 15 percent better than the previous generation unit with no increase in power consumption.