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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.

Fernando Alonso just misses qualifying for Indy 500 on first day

Former Formula One world champion Fernando Alonso will need a clutch run on Sunday to qualify for the Indianapolis 500 on May 26 after he failed to seal a guaranteed spot on Saturday. The Spaniard tried fives times to put his McLaren Racing Chevrolet in the top 30, but wound up one spot short. He can make the 33-car field only through a six-car shootout on Sunday that will determine the race's final three drivers. "We have another chance to be in the race," Alonso, who is seeking to make his second Indy 500 field, told IndyCar TV. The Spaniard twice got inside the top 30 but both times was bumped outside the mark, with JR Hildebrand and Graham Rahal the final two drivers to seal qualifying spots. Britain's Pippa Mann will be the only woman in the race, qualifying 30th in 227.244 mph. Race positions 10-30 were determined during the day-long qualifying with Saturday's nine fastest drivers set to return on Sunday to decide pole. Spencer Pigot, driving the Ed Carpenter Racing Chevrolet, led qualifying with a four-lap average of 230.083 mph. He was followed by 2018 winner Will Power of Australia (230.081) and Simon Pagenaud of France (229.854). The troubles for Alonso, whose top four-lap average was 227.224 mph, were exacerbated by a punctured tire in his first qualifying run. "That didn't help," Alonso told reporters. "But, obviously, our performance has been quite bad all week. Quite poor." The Spaniard crashed his Chevrolet in practice on Wednesday and missed nearly two full days of practice while a backup car was prepared. He returned on Friday. Alonso said he was worried the McLaren team was "not ready for the challenge." "We've been slow. You see Juncos Racing crashing yesterday and being ready at 6 o'clock. That's impressive," he said. "For us, we've been a little bit slow on everything." Alonso is bidding to join Graham Hill as the only drivers to achieve the 'Triple Crown of Motorsport' with an Indy 500 victory. He previously won the Monaco Grand Prix and Le Mans 24 Hours race. He also won two Formula One drivers' titles. (Reporting by Gene Cherry in Raleigh, North Carolina; Editing by Greg Stutchbury)Related Video: Motorsports Chevrolet McLaren IndyCar

Jeep Wrangler 4xe, new Honda Civic and EV infrastructure | Autoblog Podcast #677

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor, Green, John Beltz Snyder and Yahoo Finance Senior Producer/Reporter Pras Subramanian. They start things off by talking about what they've been driving, including the Jeep Wrangler 4xe, Chevy Bolt EUV, Nissan 370Z Nismo and Mitsubishi Eclipse Cross. They discuss the reveal of the next-generation Honda Civic, opine about the Mercedes-AMG One hybrid supercar, talk about EV charging infrastructure and reminisce about the Hyundai Genesis Coupe. Finally, they reach into the mailbag to help a listener pick a used grand tourer. Autoblog Podcast #677 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving:2021 Jeep Wrangler 4xe 2022 Chevrolet Bolt EUV 2020 Nissan 370Z Nismo 2022 Mitsubishi Eclipse Cross News 2022 Honda Civic revealed Mercedes-AMG One spy photos Green infrastructure Why the gas stations of the future might not include EV chargers — yet Ultium Charge 360 Used Vehicle Spotlight: 2010-2016 Hyundai Genesis Coupe  Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related Video: