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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.

2016 GMC Canyon Diesel Quick Spin [w/video]

The 2016 GMC Canyon Diesel and the 2016 Chevrolet Colorado Diesel are basically the same truck. This isn't really news – the two midsize pickups have been discussed side by side since their inception. If you stop reading right now, go to our First Drive story from last week, and replace "Colorado" with "Canyon," you won't miss a beat. Samesies. Looks-wise, the Canyon is a bit more polished overall than the Colorado on which its based. The front fascia has a more upscale, yet tough aura, the squared-off headlamps mimic those of the Sierra, and the alloy wheels – especially those on this SLT tester – are a premium touch. Inside the cabin, it's all carryover stuff from the Chevy truck, just with different badges and some unique color/trim combos. So it's a Colorado Diesel with a Canyon treatment. It's the typical GMC updo. But that's fine by me; this thing's a real sweetheart. Driving Notes Talk about smooth operator. This is one of the least harsh diesel engines I've ever tested, with low levels of vibration. Credit for that goes to the fancy German torque converter, as our own David Gluckman detailed in the Colorado First Drive. There's there's also very little in the way of turbo lag in this truck, aiding the silky character. I kind of miss the "turbo moment" woosh of power, but I'll happily trade that for total overall refinement. GMC hasn't released official fuel economy figures just yet, and my drive route wasn't exactly great for testing the ol' miles per gallon rating. I spent about 45 minutes slogging through traffic in Manhattan (perfect place for a diesel pickup, right?), before getting out onto the highway for another 45 or so. The combined trip returned numbers in the mid-20s, but I have to believe this truck can do better. The steering is vague, the body rolls – it drives like a pickup. That said, even though it's on the larger side of midsize, the Canyon is easy to maneuver, sight lines are great, and it's a generally pleasant-handling truck. The 2.8-liter Duramax diesel engine adds about 200 pounds to the Canyon's overall curb weight, but you don't notice from behind the wheel. Braking feel is smooth and solid, and the truck doesn't feel especially nose-heavy. Despite the anti-aero shape, the Canyon delivers a quiet ride with very little wind or road noise. Credit this to all the sound deadening material added to keep unpleasant diesel chugga-chugga-chugga noises out of the cabin.

New J.D. Power Initial Quality Study puts Porsche, GM in spotlight

J.D. Power and Associates has released its annual Initial Quality Study, and this year, Porsche and General Motors took the spotlight. The study, which asks new car owners to report problems experienced during the first 90 days of ownership, found that overall, the industry averages 113 problems per 100 vehicles.
Porsche managed a score of just 80 problems per 100 vehicles, while GMC took the second spot on the podium with 90. Lexus filled out the top three with 94 problems per 100 vehicles, followed by Infiniti at 95 and Chevrolet at 97. The study also looks at specific models, and found the Lexus LS to enjoy the best initial quality at 59 problems per 100 vehicles.
Interestingly enough, the report found that around two-thirds of most owner problems experienced in the first 90 days are attributable to vehicle design instead of mechanical failure. Specifically - echoing a refrain we've been hearing for the last few years - owners are having a hard time figuring out how to use the technology present in their new vehicles. Head over to the J.D. Power site for more information, or scroll down below for the company's related press release.