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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 is the latest automaker accused of diesel emissions cheating

Volkswagen and Ram need to make room on the diesel-emissions bench for General Motors. America's largest automaker was accused in a lawsuit on Thursday of rigging hundreds of thousands of diesel trucks with at least three so-called defeat devices to ensure that the trucks would meet federal and state emission standards, even if they generated more pollution in real-world driving. According to the complaint, on-road emissions testing conducted for the plaintiffs found that Duramax-equipped trucks produced NOx pollutants, comprised of nitrogen and oxygen atoms, two to five times higher than legally permitted, and "many times" higher than their gasoline counterparts. The proposed class-action lawsuit was filed in federal court in Detroit on behalf of people who own or lease more than 705,000 Chevrolet Silverado and GMC Sierra pickup trucks fitted with "Duramax" engines from 2011 to 2016 model years. The lawsuit seeks remedies including possible refunds or restitution for lost vehicle value, plus punitive damages. It adds to legal problems for Detroit-based GM, which has already paid about $2.5 billion in penalties and settlements over faulty ignition switches linked to 124 deaths. GM joins at least five automakers whose diesel emissions have been scrutinized by regulators or consumers. They include VW, which has admitted to cheating; Mercedes-Benz parent Daimler; Fiat Chrysler Automobiles, Peugeot and Renault. GM spokesman Dan Flores called the claims "baseless," and said the trucks comply with US Environmental Protection Agency emissions standards and California's own tough standards. Shares of GM were down 69 cents, or 2.1 percent, at $32.50 in afternoon trading, after earlier falling to $31.93. The GM lawsuit was filed by several law firms, including Hagens Berman Sobol Shapiro, which helped reach multibillion-dollar settlements with VW on behalf of drivers and dealers. The case is Fenner et al v General Motors LLC et al, US District Court, Eastern District of Michigan, No. 17-11661. The named plaintiffs are Andrei Fenner of Mountain View, California and Joshua Herman of Sulphur, Louisiana. They said they would not have bought their respective 2011 Sierra and 2016 Silverado trucks, or would have paid less for them, had they known about the alleged rigging. Joseph Spak, an RBC Capital Markets analyst, in a research report said "negative publicity" from the lawsuit could drive buyers to trucks from Ford or even Fiat Chrysler's Ram.

2017 GMC Acadia starts at $29,995

The 2017 GMC Acadia has a lower price in addition to its smaller size and 700-pound weight loss. The latest model starts at $29,995 (including $925 destination) when it arrives at dealers this spring, which is $1,905 less than last year's base version. That low price is just for the front-wheel-drive only SL trim, but there are savings throughout the 2017 lineup. The least expensive all-wheel drive version comes on the SLE model for $35,375, versus $37,100 last year (after $925 destination). The top-spec all-wheel drive Denali now costs $47,845, compared to $50,815 for the 2016 version. You can check out the MSRP for each trim in the release below. The new All Terrain model costs $40,040 and gets a more sophisticated all-wheel drive system with an active twin clutch. GMC claims the layout improves performance in wet, snowy and icy conditions. However, the trim is only available in five-passenger configuration, and storage bins in the floor replace the third-row seat. The 2017 Acadia price is also competitive with some challengers in the segment. For example, a base 2016 Honda Pilot is more expensive at $31,045 (after $900 destination), and the top Elite is $47,470, which is barely cheaper than the Denali. A base 2016 Ford Explorer is more costly at $31,995 (after $945 destination), and the Platinum for $53,915 is several thousand more than a Denali. The latest Acadia offers customers a bounty of tech and efficient powertrains. The IntelliLink infotainment system has support for Apple CarPlay and Android Auto, and there're available safety systems like front pedestrian braking and a surround view camera. Most models come with a 2.5-liter four-cylinder, which GMC estimates gets 22 miles per gallon city and 28 mpg highway with front-wheel drive. A 310-horsepower 3.6-liter V6 offers an estimated 25 mpg highway for front-wheel drive models. Both powertrains use a six-speed automatic. Related Video: 2017 GMC Acadia starting at $29,995 Drives to heart of midsize SUV segment with lower starting price, more features DETROIT – GMC announced today pricing for the all-new 2017 Acadia will start at $29,995 when it goes on sale this spring. The base price is $1,905 less than the 2016 base model and the new Acadia offers more standard equipment, including a new IntelliLink system with Apple CarPlay and Android Auto compatibility (User interfaces are products of Apple and Google and their terms and privacy statements apply.