Ford’s Super Duty midcycle refresh actually completes the fourth-generation redesign of the model that started with a redo of everything you see and now ends with a redo of the major mechanical systems—two new engines and a new 10-speed automatic transmission. For the 2020 Ford F-Series Super Duty, we’ll start with the newest of the new engines:
7.3-liter “Godzilla” Gas V-8
Bigger inside, smaller outside. Tidy exterior engine dimensions ease maintenance accessibility in all applications and afford more useful space for chassis-cab and motor-home chassis customers. Godzilla is reportedly narrower and shorter than both the V-10 and the 6.2-liter SOHC V-8. Inside, this shrunken engine’s 107.2mm bore and 101.0mm stroke pencil out to a 7,293cc (445-cubic-inch) displacement—a bump of 532cc over the V-10. The oversquare cylinder dimensions also help reduce cylinder-wall friction and heat transfer, improving overall efficiency relative to the V-10’s undersquare (90.2mm bore/105.8mm stroke) design. Overall weight is also reduced by about 50 pounds. It’s currently the largest-displacement gas V-8 in the class, but there’s room in this clean-sheet design to bump the bore and stroke up a bit, should any of its bragging rights come under fire. There’s also oodles of room in the valley to accommodate a supercharger.
Variable cam timing. There is a cam phaser on the single in-block cam. It’s a simple fixed-overlap kind like those found on GM Small Block and FCA Hemi V-8s, not the Mechadyne DuoCam setup that provides for separate intake and exhaust timing variability like the one used on the Dodge Viper. It can rotate the cam up to 60 degrees. Advancing overall timing improves low-end/light-load torque and fuel economy; retarding it at high speeds improves horsepower. Cylinder deactivation will not be available at launch but could be added if that feature proves incredibly valuable to Ram HD customers.
6.7-Liter Power Stroke Diesel
In-house. At the press event introducing its new Super Duty trucks, representatives frequently repeated the fact that Ford is the only manufacturer that designs and builds all of its own heavy-duty engines and transmissions—a not-so-subtle dig at FCA’s Cummins engine and Aisin transmission suppliers and GM’s use of Allison trannies. Indeed Ford’s latest 6.7-liter turbodiesel V-8 marks the third generation of in-house Power Stroke diesels since parting with Navistar in 2010.
Strengthened numbers. The basic block architecture is unchanged, but the compacted-graphite iron block and aluminum heads, along with the rods, bearings, and pistons, are all strengthened to withstand increased in-cylinder pressures expected in this “most powerful diesel ever offered in a Super Duty.” Power and torque figures have yet to be released, but the emphasis on power makes us wonder: Is Ford preparing us for a torque spec that doesn’t quite top the new Ram/Cummins’ kilo-lb-ft, but a power figure that blows away its 400 hp?