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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 announces net 220 job increase as Trump visits Michigan

GM announced today that about 900 jobs would be added (or, importantly, retained) ahead of President Trump's arrival in Michigan, where he is expected to discuss his plan to roll back fuel economy standards. The timing of the announcement is almost certainly not coincidental, as appending it to a Trump visit gives it a higher profile and dovetails with the President's jobs agenda. It's less likely the decision itself was made for those reasons, but the free PR boost is a nice bonus. As for those 900 jobs themselves, they aren't all new jobs. The only net gain is approximately 220 jobs at the Romulus Powertrain Plant, which produces the 10-speed automatic transmission that's proliferating through the company's lineup. The 180 jobs at Flint Assembly and 500 jobs at Lansing Delta Township are retained jobs – that is to say, spots the company found for workers who would otherwise have been laid off. By the way, the Flint jobs will help with production of heavy-duty pickups, and the Lansing jobs are to produce the Chevrolet Traverse and Buick Enclave. Finding jobs for manufacturing workers in the auto sector, whether new or retained, is admirable. No matter how GM couches it, the company has created or retained a total of 7,000 jobs this year, and its total reinvestment in US production is around $1 billion. But these decisions are business ones, not political ones – timing the announcements to make them seem inspired by economic policy, or the political situation, is simply smart PR. Related Video: Image Credit: Bill Pugliano/Getty Images Celebrities Government/Legal Buick Cadillac Chevrolet GMC

GMC boss wants a Jeep Wrangler rival

Challengers come and challengers go, but the Jeep Wrangler continues to push forward even after vehicles like the Toyota FJ Cruiser and the entire Hummer brand have been shut down. Now GMC reportedly wants to take a stab at the quintessential Jeep, as well.
The news comes directly from Buick-GMC vice president Duncan Aldred, speaking with our compatriots over at Edmunds. Although Aldred said there are no plans currently on the table to expand GMC's lineup beyond the current range, "there is plenty of room everywhere in the hierarchy."
That could include a rival to the Wrangler, as well as a flagship luxury SUV positioned above the current Yukon Denali (pictured above). Just when (or for that matter, if) such models might come into fruition remains a big question mark, but it's certainly interesting to see what GM's dedicated truck brand has on the drawing board.