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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.

2018 GMC Sierra 2500HD All Mountain concept: Nothing stops it in its tracks

Winter may not be the best time for sports cars, but snow and ice can still provide a ton of fun in the right vehicle. The Porsche Macan GTS I had back in January was a riot in the snow, and it was wearing nothing more than a good set of winter tires. What you really need to conquer the frozen north is tracks. These replace wheels with the same sort of equipment that helps tanks and snowmobiles roll over damn near everything in their paths. That's what makes the 2018 GMC Sierra 2500HD All Mountain concept so awesome. That and the 910 pound-feet of torque from the 6.6-liter Duramax turbo diesel V8. The All Mountain concept is set to debut this week in Veil, Colorado, home to ski slopes, log cabins and nearly year-round snow pack. The truck is based off a standard GMC Sierra 2500HD. The turbo-diesel V8 makes 445 horsepower in addition to the mountain of torque. Power is sent to all four corners through an Allison 1000 six-speed automatic. The new treads come courtesy of Mattracks. The 150 Series tracks aren't cheap — well into five figures with installation — but they give you a nice 16-inch surface at each corner. Other changes and add-ons include graphics on the bodywork, a RIGID E-Series 30-inch light bar, LEDs on the wheel well and underbody, Thule snowboard racks, a roll-up tonneau cover and a new speaker system from Kicker. The truck will stay on display in Veil all winter, though a similar concept will be making its way to various auto shows, starting with Los Angeles next week. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Featured Gallery GMC Sierra All Mountain Concept: LA 2017 View 9 Photos Related Gallery 2018 GMC Sierra 2500HD All Mountain concept View 10 Photos News Source: GMCImage Credit: Live photos copyright 2017 Drew Phillips / Autoblog.com GMC Truck Off-Road Vehicles

GM updating fullsize pickups for 2015

As Ford prepares to hit the market with its x-factor, aluminum-intensive F-150 and Ram sales stand tall enough to meet General Motors truck sales eye-to-eye, GM is putting the word out that it's going to add more features to its trucks and do so more regularly. An executive engineer for pickups told reporters that "a whole array" of changes are on the way as soon as the 2015 model year and then would likely come "the year after that, the year after that, the year after that."
Only GM knows the way it plans to go with its fullsize trucks, with almost everyone else - including its dealers - griping about market share at the same time as they applaud profits and hope for clarity and growth. GM raised prices on the Chevrolet Silverado and GMC Sierra not long after launch even as it was losing market share and getting called "the least successful large pickup launch over the last 15 years," further upsetting dealers, then Ram outsold the Silverado in March of this year and led GM to increase incentives. But transaction prices rose with the premium; in the first quarter of this year more than 37 percent of the trucks costing more than $40,000 were the Silverado and Sierra, leading one dealer to say of the Sierra, "You can't sell a cheap one," and the analyst who made that "least successful launch" comment to opine, "GM may have made the right call to go for price over share."
We won't know for a few months what any of these updates will be, but the rumored changes for the Silverado and Sierra appear to cover all the bases, including appearance, capability and fuel economy. Rumors run to higher gear counts, stop-start technology and diesel engines before brand-new pickups come for the 2019 model year, those next-generation models supposedly to be engineered with a lot more aluminum.