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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.

New GM subcompact SUV spied, could be a Chevy or GMC

GM's pair of subcompact crossovers have been trundling along for a while now. The Buick Encore was the first for Americans in the 2013 model year, and the Chevy Trax that was based on the Encore (an encore of the Encore, if you will) arrived for the 2015 model year. Each has undergone a mild update, but these spy photos could indicate their replacements are in the works. Or not. For starters, we can't be sure which GM brand this new SUV is destined for. Though the timing and its flowing lines could indicate Buick, the thick horizontal bars visible in the grille would indicate otherwise. The next Encore being at least related to this is at least a possibility. Making the case for GMC are those thick grille bars, the fact that it extends far below the lights, and may even rise above them, similar to the Acadia. And that rising beltline isn't that different from that of the Acadia. Arguing against the GMC idea is the Encore, which is almost always sold in GMC-Buick combo dealers. Much as the Acadia was made smaller to eliminate confusion and in-house competition with the Enclave, it's hard to see GM opting to resurrect such an issue at the bottom end of the SUV market. That means we're leaning toward this little SUV wearing a Chevy bowtie. The split grille with a large lower section and small upper section is the brand's current design language, as seen on the new Malibus and Cruzes. The shape is vaguely Equinox-like. And like Buick, Chevy also has a subcompact crossover ready for replacement: the Trax. Now, our photographer reports he's seen another subcompact testing that has Blazer design cues, but in this crossover-hungry market, we wouldn't be surprised if two similarly sized but differently styled Chevy crossovers make the grade. It's a strategy that's working pretty well for Jeep. We'll no doubt be seeing more of these disguised test vehicles milling about the country in the coming months, so perhaps we'll eventually get a better idea of what this is before more official information starts trickling out within one or two years. Related Video: Featured Gallery GM Subcompact Crossover spy shots View 10 Photos Image Credit: SpiedBilde Spy Photos Buick Chevrolet GM GMC Crossover SUV buick encore chevy trax

Autoblog Podcast #394

Episode #394 of the Autoblog Podcast is here, and this week, Dan Roth, Steven Ewing, and Michael Harley talk about the possibility of a supercharged Dodge Viper, the Chevrolet Silverado Rally Edition, the newly released supercharger kit for the Honda CR-Z, and rumblings of an Alfa Romeo 6C. We start with what's in the garage and finish 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 below with times for topics, and you can follow along down below with our Q&A. Thanks for listening! Autoblog Podcast #394: The video meant to be presented here is no longer available. Sorry for the inconvenience. Topics: Supercharged Viper Chevrolet Silverado Rally Edition Honda CR-Z Supercharged Alfa Romeo 6C In The Autoblog Garage: 2014 Ford Fiesta SE 2015 Cadillac Escalade 2015 Toyota Tundra TRD Pro 2015 Audi A8 L TDI Hosts: Dan Roth, Steven Ewing, Michael Harley Runtime: 01:32:30 Rundown: Intro and Garage - 00:00 Supercharged Viper - 44:25 Chevrolet Silverado Rally Edition - 55:19 Supercharged Honda CR-Z - 01:00:52 Alfa Romeo 6C - 01:07:29 Q&A - 01:13:41 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