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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.

GM to sink over $900M into 4 plants, mostly for a new V8

FLINT, Mich. — General Motors says it will spend more than $900 million to update four factories, with the bulk going to an engine plant in Flint, Michigan, to build the next-generation V8 for big pickup trucks and SUVs. Factories in Rochester, New York; Defiance, Ohio; and Bay City, Michigan, also will see investments, some to make V8 engine components as well as parts for future electric vehicles, the company said Friday. The investments won't create any new jobs, but they will preserve about 2,400 hourly and salaried positions positions at the four sites, the company said. The investments “provide job security at these plants for years to come,” Gerald Johnson, GM's manufacturing chief, said in a statement. Much of the money, $579 million, will go to Flint Engine Operations for equipment to build the sixth-generation small-block V8 that will go into the next round of big pickup trucks and SUVs. The plant now employs about 700 people who also will keep making their current product, a diesel engine used in light trucks. GM, like other automakers, is facing stricter government fuel economy standards and pollution limits starting in the 2024 model year. New vehicles sold in the U.S. will have to average at least 40 miles per gallon of gasoline in 2026, up from about 28 mpg, under new Biden administration rules that undo a rollback of standards enacted under former President Donald Trump. That means the new V8 will have to get better mileage and pollute less than the current versions. Although GM wouldn't release details on the new engine, Johnson said during a news conference at the Flint plant that it would be more efficient than the current version. GM has a goal of selling only electric passenger vehicles by 2035, but Johnson said that's a dozen years out, a period when many customers will still want gas engines. “We know that has a horizon,” he said. “Between here and there, there are a lot of internal combustion customers that we don't want to lose,” he said. In addition to Flint, GM's engine components plant in Bay City, Michigan, will get $216 million to build camshafts and connecting rods, and to machine engine blocks and heads for the new V8 being built in Flint. The plant now employs about 425. The Defiance, Ohio, foundry will get $55 million to build a variety of block castings for the new V8. Included is $8 million for castings to support future electric vehicles, the company said. The plant has about 530 employees.

GMC caught using Rivian R1T image for Sierra Denali EV Photoshop

The rise of electric start-ups have many legacy automakers checking their rear view mirrors as they scramble to join the EV party. Most wouldn't like to admit it publicly, but we know that at least some folks at General Motors are keeping an eye on Rivian. That's because a recent post on social media account by the General Motors design department appears to have used an image of the Rivian R1T, but heavily photoshopped. The post was intended as a peek of the GMC Sierra Denali EV's rear view. Eagle-eyed observers like AllCarNews soon noticed many familiar elements to the rendering, including the wheels and tires, mirrors and doors. Even the backgrounds are identical, including some leaves that the truck is kicking up. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Seen side by side, the two pickups' similarities don't end there. The Sierra EV is wider, but the cab's rear pillars and glass look the same as the Rivian's, just stretched horizontally. The rear bumper and its license plate cutout and reflectors on either side look a bit too close for comfort as well.  The post as since been deleted. A GM spokesperson explained the situation to The Drive, "The GM Design Instagram channel is meant to give followers an inside look at the process of designing new products and the creative teams behind it. Often, these posts use sketches made for internal studio use during design development. The sketch in question was intended for internal use only, and was posted without the necessary approval. It has been removed from the GM Design Instagram page." Automakers often use products from the competition as benchmarks or design inspiration. Designers sometimes use existing images as a starting point as well, in order to quickly get an idea down "on paper". They just tend to do it in private. A juggernaut like GM using an image from an upstart like Rivian is embarrassing for the General, but surely an ego boost for the EV brand.  When dealing with an up-and-comer, perhaps it's best to take a page from Mad Men's Don Draper. In season four of the advertising drama, a newspaper calls the hot shot exec for a quote, after a young rival publicly says he's gunning for Draper. Draper knows exactly who the reporter is talking about but when asked for comment says, "Never heard of him." Related Video This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.