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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.

2020 GMC Sierra makes diesel and 10-speed more available

The 2020 GMC Sierra full-size pickup truck doesn't look much different than the previous model, but it brings along a number of new feature updates. Specifically, certain options are now more widely available, including some powertrain options. The model year also brings about the truck's latest towing camera and some towing app updates. We'll start with the 3.0-liter diesel inline-six and 10-speed automatic, as both are more broadly available for 2020. The diesel adds the second-lowest Elevation trim level, meaning it's available in every trim except the base Sierra. The diesel is also now an option for the CarbonPro Edition AT4 and Denali, so you aren't limited to the 6.2-liter V8 for those trims. The 10-speed automatic is finally available on the 5.3-liter V8, but it's restricted to four-wheel-drive versions of the SLT, AT4 and Denali trims – lower trims retain the eight-speed automatic. The 10-speed transmission continues to be standard with the 6.2-liter V8 and 3.0-liter diesel. GMC also added new towing-related features for 2020. It has a newly-optional rear-view camera system that can show what's behind the truck's trailer, and it can project that where the trailer is on the main display, effectively making the trailer disappear. This feature was introduced in the Sierra HD. GMC also added a feature to its trailer app that lets you store and share details on your trailer setup so that it's easier for someone else to hook it up. You can even monitor and activate functions on compatible trailers with the app. There are a number of other more minor updates. Sierras can now be optioned with adaptive cruise control. The Elevation trim is available with the Crew Cab configuration. The AT4 CarbonPro Edition gets a few extra black accents compared with the 2019 version. Pricing and availability of the 2020 Sierra haven't been announced yet, though.

Editors' Picks June 2022 | Acura MDX and the revamped GMC Sierra

This month of Editors' Picks include a pair of excellent vehicles vying for a spot at the top of their respective classes. GM has long disappointed us with its latest generation of Silverado and Sierra pickups, but the 2022 update is a turning point. Plus, Acura rounds out its MDX lineup with a Type S model, and it's enough to earn an Editors' Pick. In case you missed our previous Editors' Picks posts, here’s a quick refresher on whatÂ’s going on here. We rate all the new cars we drive with a 1-10 score. Cars that are exemplary in their respective segments get EditorsÂ’ Pick status. Those are the ones weÂ’d recommend to our friends, family and anybody whoÂ’s curious and asks the question. The list that youÂ’ll find below consists of every car we rated in June that earned an EditorsÂ’ Pick. 2022 GMC Sierra 1500 2022 GMC Sierra Denali Ultimate View 44 Photos Quick take: GM fixes the GMC Sierra's biggest flaw this year with a new interior. Plus, it gains the AT4X trim for more off-road prowess and keeps all that was good from before. Score: 8.0 What it competes with: Ford F-150, Ram 1500, Toyota Tundra, Nissan Titan, Chevrolet Silverado 1500 Pros: Top-notch luxury interior, stout capability, wide range of great powertrains Cons: Ride is flinty/rough, looks that divide From the editors: Road Test Editor Zac Palmer — "It really depends on what trim level you spring for with the Sierra. Buy the Denali Ultimate, and the interior is just as good as the competition. If you're not going all out on luxury features, though, at least get the diesel. It's the smoothest operating diesel engine out there, and it's also efficient. This is one great truck when you set it up in the ideal configurations." Senior Editor James Riswick — "The GMC Sierra Denali interior has gone from "They just didn't try" to "They tried harder than everyone else." The Denali Ultimate's design, detailing and materials are particularly impressive. If you want a luxury truck, this delivers." In-depth analysis: 2022 GMC Sierra Review | GM's 'premium truck' is actually now premium   2022 Acura MDX 2022 Acura MDX Advance View 23 Photos Quick take: The MDX is one of the best luxury bargains in the three-row class. It has great looks, a sumptuous and sporty interior and even offers a Type S performance variant.