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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 CEO to meet with U.S. lawmakers over job cuts

WASHINGTON — General Motors Co Chief Executive Mary Barra plans to visit Capitol Hill next week to discuss the company's plans to halt production at five plants in North America next year and cut up to 15,000 jobs, two congressional aides said on Friday. GM has come under harsh criticism from lawmakers from both major political parties, and from President Donald Trump, since Monday when it announced the biggest restructuring for the U.S. No. 1 carmaker since its bankruptcy a decade ago. Barra is expected to meet with lawmakers from Michigan and Ohio, where GM plans to shutter three plants, as well as senior leaders in Congress. GM did not immediately comment. Barra has been calling lawmakers this week to explain the decision to end production. Trump has threatened to revoke subsidies for GM. The Detroit automaker plans to halt production next year at three assembly plants: the Lordstown small-car factory near Youngstown, Ohio; the Detroit-Hamtramck complex in Detroit; and the Oshawa, Ontario, assembly complex near Toronto. It will also stop building several models now assembled at those plants, including the Chevrolet Cruze, the Chevrolet Volt hybrid, the Cadillac CT6 and the Buick LaCrosse. Additionally, GM plans to shutter the Warren transmission plant outside Detroit and a plant that makes electric motors and drivetrains outside Baltimore, Maryland. The Cruze compact car will be discontinued in the U.S. market in 2019, although GM may continue building it in Mexico for other markets, Barra said. Reporting by David Shepardson. Related Video:

Chevy Corvette Stingray picks up another award, this time from Automobile

The new Chevrolet Corvette Stingray has picked up another buff book accolade after capturing Road and Track's Performance Car of the Year award. The seventh-generation of America's sports car (sorry Viper, Mustang, et al.) has been named Automobile Magazine's Automobile of the Year.
Automobile's award to the Corvette over competitors is the mirror image of its rival Motor Trend, which named the Cadillac CTS its car of the year over the C7. The CTS was, according to the Automobile team, the closest contender to the mighty Stingray. Great news all around for General Motors it seems.
As for what pushed the Corvette past its distant, four-door cousin, Automobile commended its excellent, 6.2-liter V8 calling the car's performance "simply awesome" while also remarking that it is easier to drive fast than ever before thanks to steering and chassis tweaks. Following a theme set by other publications, there were also plaudits for the interior, of all things, with the buff book complimenting the car's ergonomics and material quality, while also praising the standard seats.