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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 follows up Lambda CUV stop-sale with tire recall

In late January, General Motors announced a stop-sale for about 6,281 examples of the 2015 Chevrolet Traverse, GMC Acadia and Buick Enclave because of the possibility for the treads cracking on their 18-inch Goodyear Fortera HL tires. At the time, GM said that this would also eventually lead to a safety campaign to repair the problem, and the National Highway Traffic Safety Administration has just published those details. GM's recall covers 5,876 of the three Lambda platform crossovers to replace their tires. According to NHTSA, if the treads crack, there could be a loss of pressure and possible failure. Goodyear already announced its own recall of the tires after internal testing found small tread cracks. The company did not believe this was safety issue, but the problem did put the rubber out of compliance with federal laws. The business's safety campaign covered an estimated 48,512 tires. Of those, around 32,000 were reportedly made for GM to either be fitted to vehicles or sold as replacements. The remainder went to the aftermarket. Goodyear's portion of the recall is expected to begin around February 20. RECALL Subject : Tire Tread Cracking/FMVSS 110 Report Receipt Date: JAN 28, 2015 NHTSA Campaign Number: 15V044000 Component(s): TIRES Potential Number of Units Affected: 5,876 All Products Associated with this Recall Vehicle Make Model Model Year(s) BUICK ENCLAVE 2015 CHEVROLET TRAVERSE 2015 GMC ACADIA 2015 Details Manufacturer: General Motors LLC SUMMARY: General Motors LLC (GM) is recalling certain model year 2015 Buick Enclave vehicles manufactured December 9, 2014, to January 14, 2015, 2015 Chevrolet Traverse vehicles manufactured December 9, 2014, to January 20, 2015, and 2015 GMC Acadia vehicles manufactured December 9, 2014, to January 16, 2015, and all equipped with Goodyear P255/65R18 Fortera HL tires. These vehicles are equipped with tires that may experience tread cracking. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 110, "Tire Selection and Rims and Motor Home/Recreation Vehicle Trailer Load Carrying Capacity Information for Motor Vehicles with a GVWR of 4,536 kilograms (10,000 pounds) or Less." CONSEQUENCE: If the tire treads crack, a loss of tire pressure and possible tire failure may result, increasing the risk of a crash. REMEDY: GM will notify owners, and dealers will replace the tires that were manufactured within a specific date range, free of charge.

2015 Chevy Colorado to start at $20,100*, GMC Canyon at $20,995**

General Motors has just announced pricing for its new midsize pickup trucks, the 2015 Chevrolet Colorado and GMC Canyon. Chevy's truck starts at $20,100, *not including $895 for destination, and the GMC starts at $20,995, **not including $925 for destination. These prices are for the base, extended cab models with the 200-horsepower, 2.5-liter inline four-cylinder engine.
Comparatively, these prices fit nicely with the $18,125 starting MSRP of the Toyota Tacoma and the $21,510 of the Nissan Frontier. Compared to the Colorado, the Canyon's extra $895 gets you niceties like LED running lamps, 16-inch alloy wheels, and a four-way power driver's seat.
Both trucks come standard with the 2.5-liter engine, and a more powerful, 305-hp 3.6-liter V6 will also be available. Pricing has not been announced for the upcoming diesel model, which is expected to launch for the 2016 model year.