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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.

2024 GMC Acadia drops lowest trim, entry price starts at $43,995

GMC unveiled the third-generation Acadia at last summer's Detroit Auto Show, loading as many instances of "More" as it could. The all-new midsizer is longer, taller, with more room for occupants and cargo, more standard features, and a more powerful engine with a higher tow rating. The exterior dimensions return the Acadia a footprint closer to the SUV's first-gen proportions, that SUV about 201 inches long. For the 2024 version, overall length stretched another 10.6 inches to 205 inches, swallowing a wheelbase that grew 8.4 inches to nearly match that of the related Chevrolet Traverse, and overall height climbed 3.2 inches — except on the AT4 trim, which sits another inch higher thanks to a suspension lift. Plumping the exterior makes more room for occupants and cargo, GMC saying second-row passengers enjoy 27% more seat room while cargo gets 80% more space, 12.8 cubic feet formerly compared to nearly 23 cubes now. The new engine is a turbocharged 2.5-liter four-cylinder making 328 horsepower and 325 pound-feet of torque, outdoing the 2023 Acadia's retired, turbocharged 2.0-liter four-cylinder that made 228 hp and 258 lb-ft, and the retired 3.6-liter six-cylinder that made 310 hp and 270 lb-ft. It shifts through an eight-speed automatic, a loss of one cog compared to the 2023 Acadia transmission. The additional gumption means gains for the tow rating, now maxed at 5,000 pounds. That's anywhere from 1,000 to 1,700 pounds more than before. The new Acadia also comes standard with new ADAS features like enhanced lane keep assist, front pedestrian and bicyclist braking, and rear park assist, and offers Super Cruise. Early pricing info reveals that "More" extends to the window sticker, which should surprise no one. These aren't minor bumps, either. Assuming destination holds steady at $1,395, MSRPs for the 2024 Acadia and their differences from 2023 are: Elevation: $43,995 (New trim) AT4: $51,395 ($6,600) Denali: $55,695 ($6,195) Some small print: These figures pay for front-wheel drive except on the AT4, which is AWD only. Getting AWD on those other trims costs $2,000, same as now. The 2023 Acadia started with an entry-level SLE trim that cost $38,195, and that's been booted from the lineup, so too the SLT trim that started at $42,495. The 2024 Acadia Elevation brings GMC's familiar trim name into the Acadia ranks, its MSRP representing a $5,800 rise over the former entry price for the Acadia line.

2016 Green Truck of the Year, Commercial Green Car of the Year finalists

Not only are commercial-grade haulers getting more green love lately, they're getting more different kinds of green love. The 2016 Green Truck of the Year, the second time the award has been handed out, is being decided by judges from Green Car Journal and the San Antonio Auto & Truck Show. This year the award is joined by the new 2016 Commercial Green Car of the Year, which crowns one of the little vans increasingly used by small business as cargo and delivery vehicles. The Green Truck of the Year finalists are the Chevrolet Colorado Duramax (pictured), Ford F-150, GMC Canyon Duramax, Nissan Titan XD, and Toyota Tacoma. The first three of those were on last year's list, but since they are completely new or upgraded for 2016 - Ford with its all-aluminum body, the General Motors twins with the new diesel Duramax engine - they qualify for entry again. The Ram 1500 EcoDiesel won last year. The Commercial Green Car finalists are the Chevrolet City Express, Ford Transit Connect, Mercedes-Benz Metris, Nissan NV200, and Ram ProMaster City. You can read more details in the presser below, and the awards will be announced in San Antonio sometime during the show from November 19-22. San Antonio Auto & Truck Show Announces 2016 Green Truck of the Year and Commercial Green Car of the Year Finalists SAN ANTONIO, Oct. 22, 2015 /PRNewswire/ -- Green Car Journal and the San Antonio Auto & Truck Show have announced finalists for the 2016 Green Truck of the Year™ and 2016 Commercial Green Car of the Year™ awards. The Green Truck of the Year™ nominees are the Chevrolet Colorado Duramax, Ford F-150, GMC Canyon Duramax, Nissan Titan XD, and Toyota Tacoma. Vying for the all-new 2016 Commercial Green Car of the Year™ award are the Chevrolet City Express, Ford Transit Connect, Mercedes-Benz Metris, Nissan NV200, and Ram ProMaster City. "Over the past few decades, new car models have benefitted from design and technology improvements that have brought higher fuel efficiency and greater levels of environmental compatibility," said Green Car Journal and CarsOfChange.com Editor and Publisher Ron Cogan. "With models like these ten deserving finalists, we're witnessing the pickup and light commercial vehicle field enjoying the same attention." The new Commercial Green Car of the Year™ award is part of an expanded awards program presented at this year's 2015 San Antonio Auto & Truck Show.