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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.

Diesel-powered 2020 Chevrolet Silverado, GMC Sierra get big price cuts

General Motors is reducing the price difference between its diesel-powered light-duty pickups and their gasoline-burning counterparts, according to a recent report. As of September 3, 2020, the Chevrolet Silverado 1500 and the GMC Sierra 1500 benefit from a $1,500 price cut when they're ordered with a turbodiesel under the hood. Enthusiast website GM Authority first reported the news after looking at internal documents sent to dealers across the nation. It wrote the discount applies to in-stock and in-transit units of the Silverado and the Sierra (pictured), and it added dealers will begin receiving amended window stickers on September 8. And, it's not just a quick, easy way for General Motors stores to clear out 2020 inventory. Incoming 2021 models will benefit from it, too. Chevrolet's cheapest diesel-slurping 2020 Silverado, a double-cab LT with two-wheel drive, now starts at $44,000 once a mandatory $1,595 destination charge enters the equation. For context, the same configuration costs $38,795 including destination when it's ordered with the 2.7-liter turbocharged four-cylinder, which is the smallest and cheapest engine on the roster. Selecting the more efficient engine option costs buyers $5,205. At the other end of the spectrum, the crew-cab High Country with a standard cargo box and four-wheel drive is now priced at $59,690. Walk a block to the GMC store, and you'll need to spend between $44,470 (double-cab SLE with two-wheel drive) and $61,685 (crew-cab Denali with a regular cargo box and four-wheel drive) for a diesel-powered Sierra. It doesn't sound like either company is making major mechanical changes to the trucks for 2021. Both are powered by a 3.0-liter straight-six Duramax engine, which makes 277 horsepower and 460 pound-feet of torque. Rear-wheel drive and a 10-speed automatic transmission come standard, and four-wheel drive is offered at an extra cost. In its most efficient configuration, the Silverado returns 23 mpg in the city, 33 mpg on the highway, and 27 mpg in a mixed cycle, impressive numbers for a body-on-frmae pickup that's as heavy as it is capable. Ram's diesel-powered 1500 posts EPA estimates of 22, 32, and 26, respectively. Ford pledged the recently-unveiled 14th-generation F-150 will offer a turbodiesel engine, too, but its fuel economy figures are not available yet.

GM sees 'strong year' in 2018, then gold in Chevy Silverado for 2019

DETROIT — General Motors said on Tuesday it expects earnings in 2018 to be largely flat compared with 2017, but that profits should pick up pace in 2019 as its revamped line of high-margin pickup trucks hits the U.S. market. The 2018 earnings outlook was above market expectations, sending GM shares up more than 3 percent in premarket trading. "GM had a very good 2017 as we continued to transform our company to be more focused, resilient and profitable," GM Chief Executive Mary Barra said in a statement. "We are positioned for another strong year in 2018 and an even better one in 2019." GM and its Detroit rivals, Ford and Fiat Chrysler Automobiles, are bringing on new trucks at a time when overall U.S. new vehicle sales have been falling, but truck sales continue to grow as consumers abandon passenger cars in favor of pickups, SUVs and crossovers. GM on Saturday fired a new round in the battle for profits from one of the U.S. auto industry's most lucrative segments when it showed a new generation of its Chevrolet Silverado pickup truck at the Detroit auto show. The new Silverado, a highlight of the event, is the successor to GM's best-selling vehicle in North America. Sales of the current Silverado rose nearly 2 percent to 585,000 vehicles in 2017. In the coming months, the company will also reveal a revamped GMC Sierra pickup truck. U.S. new vehicle sales fell 2 percent in 2017 after hitting a record high in 2016, and are expected to drop further in 2018 as interest rates rise and more late-model used cars return to dealer lots to compete with new ones. GM said on Tuesday that while it retools a factory in Ft. Wayne, Indiana, to make the new pickup trucks, it will shift some production to an Oshawa, Ontario, plant in order to avoid missing sales in a hot market for the vehicles. The No. 1 U.S. automaker said it will record a $7 billion non-cash charge for its fourth-quarter 2017 earnings related to deferred tax assets. GM said it expects capital expenditure in 2018 of around $8.5 billion, about $1 billion of which will go toward funding self-driving car technology. Last week, the company said it is seeking U.S. government approval for a fully autonomous car — one without a steering wheel, brake pedal or accelerator pedal — to enter the automaker's first commercial ride-sharing fleet in 2019. GM said it expects 2017 earnings per share at the high end of its previously forecast range of $6 to $6.50.