A North American diesel-engine pickup now offers a new technology for meeting emissions and economy challenges. International Truck and Engine and Ford Motor Co. have enhanced the PowerStroke 6.4-liter V8 diesel engine with BorgWarner’s Turbo & Emissions System regulated two-stage turbocharger.
The turbo system consists of two differently sized turbochargers arranged in series. The smaller high-pressure turbocharger reportedly responds spontaneously at low engine speeds, while the larger low-pressure unit is responsible for providing boost at higher engine speeds. In order to make the infinitely variable adaptation of the turbine side to the compressor side, a turbocharger with variable turbine geometry (VTG) is used in the high-pressure stage. Adjustment of the VTG guide vanes is ensured by an electric actuator motor.
The revised engine will be installed under the name PowerStroke in Ford’s F series of heavy-duty pickup trucks – the F-250, F-350, F-450 and F-550 – as well as in light trucks from International, where it goes by the name of MaxxForce7.
The innovations in the improved engine are claimed to be beneficial to the environment, while not compromising power or fuel efficiency.