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GM delays 3.0-liter Duramax diesel in Silverado and Sierra pickups

Stricter testing protocols around the world are making it harder for automakers to predict launch timelines. GM is the latest to get caught in emissions nettles, the Detroit carmaker forced to delay the launch of its new Duramax 3.0-liter inline-six diesel for the Chevrolet Silverado 1500 and GMC Sierra 1500. That's what company reps told dealers in a memo seen by Automotive News this week. Dealers and buyers had been promised the Flint, Mich.-built oil-burner in early 2019, but AN wrote that the EPA certification hiccup has turned into a "slight delay." A GM spokesman told Motor1, "[We] did not attribute [the delay] to a single entity, as the truth is this is a collaborative effort between GM and several government entities. We will make the 2020MY Duramax available for dealers orders soon, and expect to deliver the first trucks to customers soon after emissions testing is complete." We know the new 3.0-liter Duramax diesel has 277 horsepower and 460 pound-feet of torque, outdoing Ford's 3.0-liter PowerStroke diesel by 27 hp and 20 lb-ft. But without final EPA paperwork, GM can't release the numbers that will show how the two engines stack up when considering fuel economy and tow ratings. The certification process has been sticky for a few other makers of late, especially since the Volkswagen Group situation in 2015. BMW had to delay the launch of four diesel models in 2016 over EPA testing. The new Ram 1500 dribbled out in a trickle last year for reasons thought to deal with EPA testing, coming as it did a year after the EPA investigated Ram's EcoDiesel engines in 2017 and 2018. More recently, WLTP testing in Europe caught out just about every automaker over there. Since we're almost halfway through 2019, the delay until the 2020 model year is only a few months. Still, GM told dealers to cancel any orders for the engine for this model year. Dealers will need to resubmit the orders once opening begins, but GM hasn't said when production will begin other than "soon." The company said that it will offer 2020-model-year replacement vehicles to customers and dealers. If prices hold into the next model year, the 2020 Silverado 1500 and Sierra 1500 with the inline-six diesel will come at a $3,890 premium over the 2.7-liter turbo four-cylinder, and a $2,495 premium over the 5.3-liter V8.

Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video:    

GM marks 500 million vehicles

General Motors is marking a major global milestone, as 500 million vehicles have rolled off its assembly lines since the company's founding in 1908. To mark the occasion, the automaker is continuing to invest in production and offering a one-time discount to some customers. GM North America boss Alan Batey used the festivities to announce the Fairfax Assembly factory in Kansas as one of the sites earmarked for the company's $5.4 billion in upcoming investments. The plant will get $174 million of that money for new equipment and technology to build the 2016 Chevrolet Malibu. Among the upgrades will be a shake-and-rattle booth that will simulate road conditions to find squeaks. To commemorate both the production milestone and the Fairfax plant, Batey and company CEO Mary Barra also gave away a 2016 Malibu to a wounded Iraqi war veteran, and the two execs announced that in the third week in May all GM employees can share a one-time customer appreciation discount with friends to help get them into the automaker's products. Barra also gave a speech to the workers there about some of the other milestone's in the company's history, which you can read below. Innovation on the Line: GM Manufacturing Milestones Many of General Motors' most important innovations have occurred behind the scenes, in its manufacturing facilities. Concepts such as changeover, flexible assembly, automation, computer simulation, machine vision and robotics were developed at GM. Over the decades these innovations have helped enable improvements in vehicle quality, efficiency and competitiveness. 1901: Ransom Olds' famous Curved Dash Oldsmobile, designed with simplicity, reliability and value in mind, was the first American car built in a factory designed specifically for automobiles and in standardized volume production. GM acquired Oldsmobile in 1908. 1908: Cadillac wins the Dewar Trophy, Europe's most prestigious award for precision and excellence in manufacturing, by demonstrating the auto industry's highest standards for precision and interchangeability of parts by disassembling three Cadillacs and mixing the parts randomly before reassembling and driving them before a contingent of judges. 1922: GM hires William Knudsen to lead Chevrolet's turnaround. Knudsen implements flexible mass production, which helps Chevrolet incorporate annual styling changes and take market share from Ford.