Setting its sights on the top once again, Ford will equip its 2015 Super Duty with an improved, more powerful, second-generation 6.7L Power Stroke V-8. Here’s the big news: This engine will propel Ford’s new heavy-duty trucks to both a class-leading 440 hp and 860 lb-ft of torque, up from the current 400 hp and 800 lb-ft of torque figures.
The most notable change will be the non-wastegated Garrett GT37 VGT turbocharger, which will replace the Garrett GT32 VGT single-sequential turbo (SST). The twin compressor wheel design of the GT32 will be dropped for the high-altitude performance and improved exhaust braking capabilities of the GT37. The GT37 features a single, 63.5mm (inducer) compressor wheel with a 66.5mm (exducer) turbine. Redesigned turbo oil and cooling lines can also be expected.
More air necessitates fuel system improvements. The cam of the Bosch CP4.2 injection pump now has a longer stroke to add displacement, and the piezo electric injectors use redesigned tips that spray a finer mist of fuel for a more complete burn. The new tips also reduce emissions, noise, and vibration. Other changes have been made to enhance efficiency and durability: new polymer coating for the main bearings; new exhaust temperature sensor; improved crankshaft fillet design; increased crankshaft damper weight; added material to cylinder heads, exhaust manifolds, and valvetrain; piston assembly upgrades; new, five-layer head gaskets; and four-layer exhaust manifold gaskets. A new torque converter for the 6R140 TorqShift six-speed transmission handles the increased power, as do the heat-treated damper springs and strengthened intermediate shaft. Fuel economy for the Gen II Power Stroke is expected to stay on par with the current truck. All this combines to produce the most powerful diesel engine you can buy in a consumer-grade truck.
|Engine: ||Power Stroke V-8|
|Bore and Stroke:|| 3.90 x 4.25 inches|
|Cylinders:|| 90-degree V-8|
|Block:|| Compacted graphite iron|
|Heads:|| Aluminum (reverse flow)|
|Valvetrain:|| OHV, four valves per cylinder|
|Horsepower:|| 440 at 2,800 rpm|
|Torque:|| 860 lb-ft at 1,600 rpm|
|Induction: ||Single-wastegated variable-geometry Garrett GT37 turbocharger|
|Fuel System:|| High-pressure common-rail, Bosch CP4.2 injection pump, piezo electric injectors|
|Emissions Equipment:|| EGR, DPF, SCR|
|Engine Dry Weight:|| 970 pounds|