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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.

Sunday Drive: An automotive flavor for every taste

Last week was flush with interesting new vehicle debuts, led by the new 2019 Hyundai Santa Fe. This crossover is entering straight into the heart of one of the world's most competitive automotive segments, and it's doing so with a fresh sense of style and a brace of new technologies. Our readers are clearly intrigued – the Santa Fe was the biggest news story of the last week on these online pages. It's fitting that a crossover generated a lot more interest than a traditional wagon, though we don't really have to be happy about it. Still, the completely new, fully redesigned Volvo V60 is worth taking another look at. First of all, it's pretty, in a traditionally Scandinavian way. Second, it's quick, with a 0-60 time of as little as 4.8 seconds. And finally, it's practical, with all kinds of room for cargo without the dynamic penalties of an unnecessary lift kit. Moving on from new vehicle debuts, we took another long look at the Honda Ridgeline. It's definitely a non-conformist pickup truck, based not on a body-on-frame platform but on a more carlike unibody design. That means it can't tow as much as some other trucks, but it also means the Ridgeline drives better than any of its more truckish competitors. It's the Swiss army knife of pickup trucks. Rounding out our coverage from last week are three sets of spy photos, each showing the interior of a hotly anticipated new model. One is a truck, one is a crossover, and the last is a sportscar. All of them are worth another look. As always, stay tuned to Autoblog this week for all the most important news in the automotive world. 2019 Hyundai Santa Fe unveiled 2019 Volvo V60 | Sleek, swift new twist on the Swedish wagon 2018 Honda Ridgeline | Pocketknife pickup is up for anything 2019 GMC Sierra interior looks just like the Silverado's 2019 Cadillac XT4 interior has actual buttons, no more touch-sensitive panel 2020 Porsche 911 992 spy shots show interior and manual transmission Cadillac GMC Honda Hyundai Porsche Volvo Truck Crossover Wagon Luxury Performance Sedan hyundai santa fe

GM announces 6 recalls covering nearly 720k cars

General Motors has announced yet another sprawling recall campaign, with six separate elements covering 717,950 vehicles on US roads. At this point in 2014, it's starting to seem like there are more days with a GM recall than without. Perhaps most troubling about this latest volley, though, is that every vehicle is from the past few years, indicating that GM's quality woes may not be limited to pre-bankruptcy vehicles.
The largest element of this latest campaign covers 414,333 units, and includes the 2011 to 2012 Chevrolet Camaro, 2010 to 2012 Chevy Equinox, GMC Terrain and Cadillac SRX and the 2011 to 2012 Buick Regal and LaCrosse. Only vehicles with powered, height-adjustable seats are covered. In these particular cars and crossovers, the bolt that secures the height adjuster actuator may loosen of its own accord and in some cases fall out completely. If this happens, the seats will be able to move both up and down. GM claims the vehicles are safe to drive, provided drivers don't vertically adjust their seats. This particular issue has caused one crash and three injuries.
The largest element of this latest campaign covers 414,333 units, including the Chevrolet Camaro and Equinox, GMC Terrain, Cadillac SRX and the Buick Regal and LaCrosse.