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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.

GM says hybrid Corvette no laughing matter [w/poll]

When Mark Reuss was in LA recently, he sat down to have a few words with the scribes at the Los Angeles Times. When the issue of a hybrid Corvette came up, Reuss answered with "Don't laugh." The General Motors president is a complete fan of the possibility, calling it "attractive" and "really fun," believing it would improve GM expertise and that "people would love it."
Naturally, the president being supportive of an idea doesn't give indication that a hybrid Corvette is on the way. However, with supercars like the Porsche 918 Spyder and Ferrari LaFerrari giving hybrid tech a solid, if remote, place in the performance car world, the inexorable trickle-down of technology means we shouldn't be surprised if and when it does happen.
And now that we have that non-negative half-answer to a speculative question, it would be irresponsible for us not to commence rumormilling for the C8 Corvette. Taking Reuss at his word, the C8 will obviously be a hybrid with all-wheel-drive - the left side wheels driven with electric motors, the right side with the mid-mounted, four-cylinder diesel engine. With coefficient of drag of just .16, figure on a 0-to-60 mile-per-hour time of under 2 seconds and an all-electric range of something like 30 miles at top speed. Don't forget, folks, you read it here first.

Camaro chief: 'rock-star' 4-cylinder set for Mustang fight

It was inevitable, the 2016 Chevy Camaro had to have a four-cylinder engine. The archrival Ford Mustang packs a spunky 2.3-liter EcoBoost four-banger, and everyone from BMW to Subaru uses four-cylinders to great effect to power their sports cars. Now it's Chevy's turn. Again. The Camaro ran the infamous Iron Duke four-cylinder with 88 to 92 horsepower in the 1980s. It was a fuel-economy play at a time when performance was not a priority. After the 1970s muscle-car era, output even for the V8s didn't top 200 hp again until the mid-'80s. Thankfully for enthusiasts, things have changed dramatically in the last 30 years. The gen six Camaro will offer a 2.0-liter inline four-cylinder with 275 horsepower. It's the standard engine, slotting below the 335-hp V6 and the 455-hp V8. But don't mistake the new I4 for an Iron Duke encore. Camaro chief engineer Al Oppenheiser called it a "rock star" and said cars equipped with it feel lighter than V6 models. The four-cylinder (295 pound-feet at 3,000-4,500 rpm) also summons more torque in quicker fashion than the V6 (284 lb-ft at 5,300 rpm). Chevy expects the Camaro to hit 60 miles per hour in "well under six seconds," according to press materials. The Mustang EcoBoost (310 hp, 320 lb-ft) clocks times in the low to mid five-second range. "We're not doing it just so we have one," Oppenheiser said. "We're not doing it because like in gen three you're forced to do it because of fuel economy. We're doing it because it belongs in the car. It has a distinct character." Speaking with Autoblog recently at the Detroit Grand Prix racecourse on Belle Isle, Oppenheiser said he expects the I4 to attract a younger crowd to the Camaro and will put up stiff competition against the V6 for sales. "I've read blogs where younger folks won't buy a Camaro because it doesn't have a 2.0-liter turbo or a turbocharged four-cylinder," he said. "So we're going to excite them." While we talked a lot about four-cylinder engines, Oppenheiser also elaborated on the V6 (It's pretty damn good, too. We drove it.) and the new Alpha platform that the Camaro borrowed from Cadillac. Here's the rest of our edited conversation. Autoblog: Talk a little bit about the four-cylinder – the first turbo four-cylinder ever for Camaro. Do you have any idea what the take rate's going to be? Al Oppenheiser: I think it's going to surprise a lot of people. It's actually a fun car to drive. It's got a really good balance of turbo noise and exhaust note.