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GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.

2018 GMC Yukon Denali gets a sculpted new grille

More than half of all GMC Yukon and Yukon XL models sold wear top-level Denali trim. That's a profitable scenario for the automaker, so, perhaps above all else, GMC needs its premium Denali series of vehicles to continue to stand out in a line of trucks and SUVs at the dealership lot. Hence, chrome, and lots of it. But for 2018, GMC is blessing the behemoth Yukon Denali with an added dose of class with a new multi-dimensional grille. "The new grille, which is flanked by HID headlamps and LED Signature Lighting, advances the design legacy established with the very first Yukon Denali in 1999," said Matt Noone, director of Global GMC Exterior Design. In addition to a sophisticated new look, the grille adds customizable cooling capabilities to the Denali range. Active shutters open when additional cooling is needed, or close to reduce aerodynamic drag when the engine isn't too warm. Further increasing the efficiency of the big brutish 'ute is a new 10-speed automatic transmission. That's two extra gears over the 2017 Yukon Denali, leading to a numerically lower final drive to help save fuel at highway speeds. Inside, Mastique Ash wood trim differentiates the 2018 model from previous years. A 420-horsepower 6.2-liter V8 engine remains standard for 2018, as do blingy 20-inch wheels with 22 inchers optional. Related Video: Design/Style GMC SUV Luxury gmc yukon denali

General Motors could turn Hamtramck into its electric pickup, SUV hub

Electric off-roaders could revitalize the Detroit-Hamtramck factory that General Motors previously announced it will close. While official details remain shrouded in secrecy, analysts believe the plant will be re-tooled to manufacture at least three electric models due out during the early 2020s. The plant's scheduled closure was one of the grievances the United Auto Workers (UAW) union cited when it embarked on a 40-day strike in September 2019. General Motors agreed to keep it open without shedding much light on what it planned to build there. Analyst at LMC Automotive told the The Detroit News they believe an often-rumored electric SUV that will resurrect Hummer's name, image, or both will be one of the models assigned to the Hamtramck plant. Battery-powered variants of the GMC Sierra and the Cadillac Escalade will be made there, too, as will an enigmatic van. LMC Automotive's Jeff Schuster believes the van will come first; it could enter production as early as 2021. The Hummer — which might also be offered as a pickup — will follow before the end of 2022, while the Sierra and the Escalade will both arrive in 2023. We're taking this report with a grain of salt, though, because only one of the aforementioned models has been announced by General Motors. Rumors of a Hummer resurrection emerged in the summer of 2019, just a few weeks before we heard unverified reports of a battery-powered variant of the next-generation Escalade. General Motors confirmed plans to enter the burgeoning electric pickup truck segment, which Ford, Rivian, and Tesla also have their sights on, but it hasn't detailed how or when. The van is a mystery. General Motors refused to comment on the report. It previously announced it will keep Hamtramck open, and invest $3 billion to build electric vehicles there. The investment will create 2,225 jobs. Inaugurated in February 1985, the Hamtramck factory has churned out a diverse selection of models over the past 34 years, including Cadillac's Eldorado, Seville, and Allante, the Oldsmobile Toronado, the Buick Riviera, and more recently, gasoline-electric Chevrolet Volt. General Motors announced plans to close Hamtramck in 2018, but it quickly backpedaled and extended its lease on life until 2020 by keeping the Chevrolet Impala and the Cadillac CT6 around for a few additional months.