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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.

Chevy Bolt interior spied for first time

Chevrolet is continuing work on its Bolt EV, but thanks to some public-road testing in what looks to be somewhere in Michigan, we've captured our first look at the new hatchback's screen-intensive dash. Looking like a blend of the Chevy Sonic with the new Volt, the Bolt's interior follows a simple formula, offering a digital display in place of the traditional instrument cluster alongside a large, prominent display in the center stack. Nothing too shocking, except for the fact that both displays look larger than what's in the Volt. What's most surprising, though, is the shifter. It looks almost BMW-like in appearance. There's a dedicated park button accessible by the driver's thumb, and we're guessing a trigger on the front that can toggle the lever forward into reverse and backwards into drive. The central display, meanwhile, looks like it's running some very different looking software, compared to Chevy's usual MyLink fare. We can't be sure whether this is simply some development software that's free of polish and not intended for production, or a look at a new form of Chevy's connectivity suite. Aside from some different wheels, the exterior of this prototype looks unchanged from the last round of spy photos we captured of the new Bolt. Sorry kids, no new exterior styling to show you today. Still, we've included the entire crop of spy images, covering a variety of exterior angles along with several shots of the interior. Related Video:

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