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Chevy's 6.6-liter Duramax is pretty much all new

To say there's a heated battle in heavy-duty pickups is an understatement, with Chevrolet, Ford, and Ram constantly trading blows of increased torque, horsepower, and towing capacity. The latest salvo is the revised, more powerful turbo diesel 6.6-liter Duramax V8 in the 2017 Chevy Silverado. It has 910 pound-feet of torque, an increase of 145, putting it nearly level with the Ford Super Duty. Here's a closer look at where those gains come from. How exactly did Chevrolet add all that torque plus 48 horsepower? The automaker essentially took a fine-tooth comb to the entire engine. Chevy says it changed 90 percent of the V8, and the cumulative effect of those small changes adds up to big increases. As you might guess, the turbocharger is updated. The larger unit features electric actuation of the variable nozzle turbine (VNT), and what Chevy calls a double axle cartridge mechanism that separates the VNT moving parts from the housing. That helps with heat performance as well, with a claim that the exhaust side of the turbo can run continuously up to 1,436 degrees Fahrenheit. Helping that cause are six exhaust gaskets made of Inconel - an nickel alloy that contains chromium and iron – and upgraded stainless steel for the exhaust manifold. Despite having the same cast iron cylinder block, albeit with some minor enhancements, the engine has new cylinder heads, pistons, piston pins, connecting rods, and crankshaft, which have all been upgraded to handle 20 percent higher cylinder pressures. Alongside the increase in pressure, Chevrolet also increased the cylinder head's structure with a honeycomb design. The pattern features high-strength aluminum with dual layer water jackets that not only improve strength, but also optimize water flow for better cooling. For 2017, the cylinder head also benefits from integrated plenum that aids the engine in getting more air under heavy loads. The cylinder head isn't the only component to get a minor update, as the pistons have a larger diameter pin for improved oil flow. The same detailed improvements has been bestowed to the humble connecting rods (second in our hearts only to the inanimate carbon rod). The new design has the bolts oriented roughly 45-degrees to the rod instead of parallel. The angle split design, as it's called allows for easier passage through the cylinder.

GM extends production at Detroit factory until early 2020

General Motors Co said on Friday it had extended the production at its Detroit Hamtramck plant until January 2020, against an earlier plan to discontinue production in June this year. The No.1 U.S. automaker is revamping its operations, which include plant closures and thousands of job cuts, as it looks to boost profitability in the wake of declining U.S. auto sales. The Hamtramck plant will continue to produce the Chevrolet Impala and Cadillac CT6 sedans until early next year, the company said. "We are balancing production timing while continuing the availability of Cadillac advanced technology features currently included in the CT6-V — the Blackwing Twin-Turbo V-8 (engine) and Super Cruise (driver assistance system)," GM said. The plant has already discontinued production of the Buick LaCrosse sedan and Chevrolet Volt electric hybrid car. Detroit-based union United Auto Workers' President Gary Jones said GM's decision to continue production at the plant was a relief for the workers as well as their families. "We commend GM for today's decision and we reiterate the importance of a collective bargaining process in times like these," Jones said. Reporting by Ankit Ajmera. Related Video:

Driving the C8 Corvette, and previewing GM's electric future | Autoblog Podcast #617

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by West Coast Editor James Riswick and Road Test Editor Zac Palmer. First they dive right in to the experience of driving the 2020 Chevrolet Corvette, followed by their review of the Mercedes-Benz GLE 350. Then they talk about the week's news, beginning with the whole slew of electric vehicles General Motors surprised us with at its EV Day. Next, they discuss the possibility of Porsche building a hybrid 911, as well as news about Ford's electric Transit van making its way to the U.S.. Last, but not least, they take to the mailbag to help a listener pick his next car in the "Spend My Money" segment. Autoblog Podcast #617 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 Driving the 2020 Chevrolet Corvette Stingray Driving the 2020 Mercedes-Benz GLE 350 GM EV Day: Cadillac Celestiq and Lyriq, GMC Hummers and more A hybrid Porsche 911? Ford Transit electric commercial vans coming to U.S. Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: