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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 will recall more than 3.3 million vehicles in China for suspension defect

BEIJING (Reuters) - General Motors' joint venture in China, Shanghai GM, will recall more than 3.3 million Buick, Chevrolet and Cadillac vehicles stating Oct. 20 because of a defect with the suspension system, China's market regulator said on Saturday. GM Shanghai said in a text message to Reuters that the suspension arm may be deformed under extreme operating conditions, but there are no known casualties related to the issue. The recall includes cars produced between 2013 and 2018, the State Administration for Market Regulation said in a statement. GM will contact those affected and repair the vehicles free of charge, it said. (Reporting by Josephine Mason and Hallie Gu; additional reporting by Yilei Sun; Editing by Shri Navaratnam and Michael Perry)Related Video: Image Credit: Qilai Shen/Bloomberg via Getty Recalls Buick Cadillac Chevrolet Safety

2014 Chevrolet Corvette Stingray Convertible is a Swiss hit

We've just received an early peek at the 2014 Chevrolet Corvette Stingray Convertible here at the Geneva Motor Show. General Motors was kind enough to let us attend the final dress-rehearsal for its press conference scheduled for tomorrow's opening media day, and we've come away with a good look at the droptop C7 in person.
In the metal, the new Corvette Convertible seems somehow less avant-garde than the Coupe, even in Z51 Performance Package guise. That's not necessarily a bad thing - more of an observation. That initial impression may be because the C7's new greenhouse is one of its most prominent departures from Corvettes past. While we didn't get to see the top erected, there's no rear side window in the stock images that Chevy has already released, suggesting the C7 convertible's profile will look a lot like its C6 predecessor. And with the new power tonneau cover in place, there are also no rear ducts that come as part of the Z51 package (they've been moved under the car).
As with its predecessor, the tonneau is a handsome double-bubble piece, and the body-color "waterfall" element into the cabin between the seats has made it to the new model as well. Thus, the overall look with the top down should be a bit more familiar to prior-gen C6 owners - if you're one of those put off by the C7's new shape, you'll probably appreciate the convertible bodystyle more than the coupe.