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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.

2022 GMC Hummer EV Drivers' Notes: We can't stop talking about Crab Walk

The 2022 GMC Hummer EV Pickup defies reason and sense in most ways. It’s a pickup that weighs over 9,000 pounds, but will do the 0-60 mph sprint in around 3.0 seconds. That sounds like something to be afraid of, but itÂ’s also something you want to experience. ItÂ’s a feat of engineering to make something so heavy move so quickly, but thatÂ’s what the EV revolution has brought upon us. GMC gets the Hummer up and moving as quickly as it does with three electric motors — one in front and two in the rear — that combine for a nutty 1,000 horsepower and 1,200 pound-feet of torque. All of that power is unleashed in Watts To Freedom (WTF) mode. Your seat starts rumbling; the air suspension lowers you to the ground, and an electrifying soundtrack is played over the speakers to match your throttle applications. Launching this supertruck is an event every single time, but due to its extra-high ride height and off-road chops, sending it down your favorite trail is, too. That is, assuming said trail is wide enough to fit the gargantuan Hummer. Those knobby all-terrain tires keep the Hummer from being even mildly entertaining when you explore the truckÂ’s handling Â… but who cares. Our specific tester is an Edition 1 model, which means it comes fully loaded with every option you can imagine. As such, its price is $110,295. For the amount of performance and capability on display here, that number sounds surprisingly right. ItÂ’s also befitting the HummerÂ’s status as a supertruck, wherein you get everything youÂ’d ever want in one go-anywhere do-anything package. Editor-in-Chief Greg Migliore — The Hummer EV is the biggest rock star vehicle IÂ’ve tested in quite some time. Literally. ItÂ’s huge and attracts a ton of deserved attention. The Hummer design is spot-on, especially the grille, lights and flared fenders. It looks the part. For $110,000, it should also have some substance, and this Edition 1 delivers Super Cruise, Watts to Freedom and CrabWalk, not to mention GMCÂ’s MultiPro tailgate and the removable Sky Panel roof. It feels quick, as you would expect something with 1,000 hp to feel, and itÂ’s shockingly maneuverable. I CrabWalked down my street to show off, navigating around things on the diagonal and amusing the neighbors. Just the regular four-wheel-steering function, which functions similar to those offered by various other cars, allows the Hummer to turn easily and confidently.

Autoblog Podcast #416

Episode #416 of the Autoblog Podcast is here, and this week, Dan Roth, Steven Ewing, and Brandon Turkus talk about the 2016 Mazda MX-5 Miata, seeing the 2016 Nissan Maxima in the company's Super Bowl ad, and GMC's potential plans for a Jeep Wrangler fighter. Of course, the podcast starts with what's in the garage and finishes up with some of your questions, and for those of you who hung with us live on our UStream channel, thanks for taking the time. Check out the rundown with times for topics, and you can follow along down below with our Q&A. Thanks for listening! Autoblog Podcast #416 Topics 2016 Mazda MX-5 Miata first drive 2016 Nissan Maxima previewed in Super Bowl ad GMC mulling Jeep Wrangler fighter In The Autoblog Garage 2015 Hyundai Genesis 5.0L V8 2015 Honda CR-V Long-Term 2015 Volkswagen GTI Hosts: Dan Roth, Steven Ewing, Brandon Turkus Runtime: 01:36:43 Rundown Intro and Garage - 00:00 Maxima – 30:48 Miata – 41:46 GMC/Wrangler – 59:14 Q&A - 01:11:13 Get The Podcast UStream – Listen live on Mondays at 10 PM Eastern at UStream iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Feedback Email – Podcast at Autoblog dot com Review the show in iTunes Podcasts GMC Honda Hyundai Jeep Mazda Nissan Volkswagen vw gti nissan maxima