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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.

Looking back on our favorite cars of Mad Men

The second half of the seventh and final season of Mad Men debuted this week, set to cap a run of public and critical acclaim. A decade's worth of interesting cars also made for good television, if you were paying attention. Vehicles didn't often steal the spotlight from Don, Betty, Roger, Joan and the gang, but they added meaningfully to the tone and beauty of the series. We sorted through the wheeled extras from Mad Men's archives, and choose some of our favorites to highlight. The list consists of cars that had at least a small impact on the plot of an episode, though certainly there are worthy gems hiding in just about every street and driving scene. Check out our subjective top five, and then let us know which of the Mad Men cars would be on your list. 1962 Cadillac Coupe DeVille – Season 2 Don Draper's Cadillac Coupe DeVille, all 500 feet of it, shows up in a few seasons of the show, but it's the first appearance that sets the tone. A Cadillac salesman, cut from the same cloth as Draper, asks what Don drives right now. "A Dodge," Don admits. "Those are wonderful if you want to get somewhere," allows the salesman, "this is for when you've already arrived." For a man on the move up corporate and social ladders that's a powerful message, and a pitch-perfect car. 1961 Lincoln Continental – Season 3 The most stylish Lincoln Continental ever is perfect set dressing for the mod show, of course. Though it's interesting that the car isn't cast as dapper Draper's ride, but rather his father-in-law's. Grandpa Gene does what all great grandfathers are bound to: lets his granddaughter Sally drive the big Lincoln while he works the pedals. Generational bond secured, in fine fashion. When you go back through the first three seasons of the show, you'll notice that Continentals show up more than once, too. There's nothing quite like them to evoke the best of the early '60s. 1963 John Deere 110 – Season 3 The only non-standard passenger vehicle on the list, no self-respecting gearhead/Mad Men fan should quibble with the inclusion of the John Deere 110 riding mower. For starters, the Deere is lovely to look at; a miniature version of the American Heartland icon in its green and yellow duds. The 110 appears as if milled from a solid block of steel, just the opposite of today's sleek, plasticky lawn minders (we're scouring Craigslist for one to bring home). The John Deere also has dear ramifications to the plot, too.

Race Recap: Rolex 24 at Daytona was fast and feisty

Let the record show that victory at the 2015 Rolex 24 at Daytona went to the No. 02 Chip Ganassi Racing with Felix Sabates Target/Ford EcoBoost Riley DP driven by Verizon IndyCar drivers Scott Dixon and Tony Kanaan and NASCAR drivers Jamie McMurray and Kyle Larson. The winner did 740 laps to cover 2,634.3 miles in 24 hours and 57.667 seconds. That's a statement to this year's pace in spite of 18 cautions, two more than last year: the Michael Shank Racing Ligier got pole with a time of 1:39.194, slower than last year's pole time of 1:38.270; however, the winning car last year only did 695 laps. The fight for top honors was shaved to a four-car battle over the first third of the event. The No. 02 Ganassi car took the lead on the first lap, swapping it well into the night with the No. 01 Ganassi car, the No. 10 Wayne Taylor Racing Corvette DP, and the defending champion No. 5 Action Express Corvette DP, all of them staying within about 20 seconds of one another. The Action Express car had a fuel connector come loose and lost three laps getting towed back to the pits to have it reattached, but was back in the lead 18 hours in. The No. 01 Ganassi car dropped out with recurring clutch problems 22 hours in, retiring not long after. A race-within-the-race is where the concluding action happened, a seven minute, 30-second dash from the end of the last caution to the checkered flag. During the penultimate pit stops with an hour to go, Dixon was in second place followed Jordan Taylor in the Wayne Taylor Racing DP into the pits but beat him out, taking the lead. The Action Express car was in third. In the last pit stops of the race, Dixon gained even more time, getting a four-second advantage over Taylor. Then a full-course caution came out twenty minutes before the finish when a Prototype Challenge car hit the wall and caught fire, bunching up the field. That closed the pits, but the Wayne Taylor Racing car had to pit during that yellow because of a miscalculation of driver time. No driver can be behind the wheel for more than four hours in a six-hour period but Jordan Taylor was going to go over, so he came in to swap out for brother Ricky. That cost the team any chance of second place, since they took an additional drive-through penalty for entering closed pits. When the track went green again, Sebastien Bourdais in the Action Express car stayed all over Dixon for the final five laps but couldn't get around him.