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GMC teases rugged 2021 Canyon AT4 pickup

GMC promised every model in its lineup would get the AT4 treatment by 2021. Having introduced AT4 versions of the Sierra, Acadia and Sierra HD already, that leaves the Canyon, Terrain and Yukon waiting their turn for the procedure. During a press even for the Sierra HD in Jackson Hole, Wyoming, GMC teased Canyon AT4 as next in line to receive upgraded off-road chops. The automaker had a camo'ed prototype Canyon AT4 in a trailer hooked up to a Sierra HD. When Sierra occupants pulled up the feed from the trailer-mounted camera on the infotainment screen, said occupants got a view of the masked midsize pickup between two walls reading, "The first ever Canyon AT4" and "Coming early 2020." The main mysteries are how extensive the pickup's AT4 transformation will be, and when it will go on sale. The AT4 kit changes depending on model. The Sierra AT4 upgraded performance and looks, with features like a two-speed transfer case, locking rear differential, a two-inch lift and Rancho monotube shock absorbers, skid plating, black-chrome grille and body-colored grill surround. The 2020 Acadia AT4 is mostly about looks, pairing standard all-wheel drive with black trim and wheels, and all-terrain tires. The Canyon's expected to weigh in on the Sierra end of the overhaul, and slide into the lineup between the SLT and top-tier Denali trims. The mods will put it beyond the current All Terrain trim being phased out across the lineup, but leave space between the Canyon AT4 and its Chevrolet sibling, the Colorado ZR2. GMC VP Duncan Aldred said, "They’re going to have different capability levels. The ZR2 is extreme capability. AT4 isnÂ’t positioned as extremeÂ… not intended to rival the ZR2." And the Colorado gets the even chunkier Bison version on top of that. The Canyon AT4 is predicted to join the lineup for the 2021 model year, so although it's "coming early 2020," it might not go on sale until much later in the year. GM's midsized pickup twins will be endowed with changes so mild that neither brand will classify the work with the term "midcycle enhancement." Figure a refining around the grille and lights and a few minor fillips otherwise. Next-generation models of the Canyon and Colorado aren't due until 2023, and there's apparently debate inside GM about an interior refresh for both trucks before then. The Terrain should mirror changes to the Acadia, and it would be a pleasant surprise to see the all-new Yukon also due in early 2020 get serious off-road teeth.

GM pauses 3.0-liter turbodiesel production due to a supplier shortage

General Motors confirmed it has temporarily stopped taking orders for trucks and SUVs equipped with the 3.0-liter Duramax turbodiesel six-cylinder engine. It blamed the last-minute pause on a supplier-related shortage. Website TFL Truck first reported the news, and a representative from General Motors quickly confirmed it. The spokesperson explained the issue is due to a "temporary part shortage" and added that production will resume "as soon as possible," meaning the Duramax engine (which is called LM2 internally) is not going away permanently. Additional details are not available, so we don't know if the issue is related to the ongoing chip shortage. Rather than delay deliveries and create a backlog, General Motors is reportedly asking its dealers to encourage buyers who want a turbodiesel engine to instead select either the 5.3-liter V8 or the 6.2-liter V8, depending on the model selected. Both are gasoline-powered units. There's no word yet on when Duramax production will resume. The shortage affects several models, including Chevrolet's Tahoe, Suburban, and Silverado 1500 and GMC's variants of these trucks. Cadillac's Escalade is temporarily diesel-less as well. Heavy Duty variants of the Silverado and the Sierra are not affected because they're powered by a different Duramax engine with eight cylinders. Motorists seeking a full-size SUV powered by an efficient turbodiesel engine are temporarily out of options because the Tahoe/Yukon and the Suburban/Yukon XL had the segment to themselves. The Duramax was surprisingly popular, too: in May 2021, GM Authority reported that the turbodiesel straight-six represented 8% of Suburban sales and 6% of Tahoe sales. Installed in a rear-wheel-drive Tahoe, the engine returns 21 mpg in the city, 28 mpg on the highway, and 24 mpg in a combined cycle, figures that make the body-on-frame behemoth more efficient than the unibody, front-wheel-drive Chevrolet Blazer that's 20 inches shorter and approximately 1,700 pounds lighter. Related video: 2021 Chevrolet Tahoe 3.0L Duramax engine

Chevy's 6.6-liter Duramax is pretty much all new

To say there's a heated battle in heavy-duty pickups is an understatement, with Chevrolet, Ford, and Ram constantly trading blows of increased torque, horsepower, and towing capacity. The latest salvo is the revised, more powerful turbo diesel 6.6-liter Duramax V8 in the 2017 Chevy Silverado. It has 910 pound-feet of torque, an increase of 145, putting it nearly level with the Ford Super Duty. Here's a closer look at where those gains come from. How exactly did Chevrolet add all that torque plus 48 horsepower? The automaker essentially took a fine-tooth comb to the entire engine. Chevy says it changed 90 percent of the V8, and the cumulative effect of those small changes adds up to big increases. As you might guess, the turbocharger is updated. The larger unit features electric actuation of the variable nozzle turbine (VNT), and what Chevy calls a double axle cartridge mechanism that separates the VNT moving parts from the housing. That helps with heat performance as well, with a claim that the exhaust side of the turbo can run continuously up to 1,436 degrees Fahrenheit. Helping that cause are six exhaust gaskets made of Inconel - an nickel alloy that contains chromium and iron – and upgraded stainless steel for the exhaust manifold. Despite having the same cast iron cylinder block, albeit with some minor enhancements, the engine has new cylinder heads, pistons, piston pins, connecting rods, and crankshaft, which have all been upgraded to handle 20 percent higher cylinder pressures. Alongside the increase in pressure, Chevrolet also increased the cylinder head's structure with a honeycomb design. The pattern features high-strength aluminum with dual layer water jackets that not only improve strength, but also optimize water flow for better cooling. For 2017, the cylinder head also benefits from integrated plenum that aids the engine in getting more air under heavy loads. The cylinder head isn't the only component to get a minor update, as the pistons have a larger diameter pin for improved oil flow. The same detailed improvements has been bestowed to the humble connecting rods (second in our hearts only to the inanimate carbon rod). The new design has the bolts oriented roughly 45-degrees to the rod instead of parallel. The angle split design, as it's called allows for easier passage through the cylinder.