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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.

Autoblog Podcast #384

Episode #384 of the Autoblog podcast is here, and this week, Dan Roth, Steven Ewing and Chris Paukert talk about rumors that the Subaru WRX Concept styling may influence the next production model, the 2015 Chevrolet Corvette Z06, and Chris' time with the 2015 Lincoln MKC. 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 new rundown below with times for topics, and you can follow along down below with our Q&A. Thanks for listening! Autoblog Podcast #384: Topics: Long-term 2015 Subaru WRX introduction Subaru WRX Concept styling may see production 2015 Lincoln MKC 2015 Chevrolet Corvette Z06 In the Autoblog Garage: 2014 Mercedes-Benz E550 Cabriolet 2014 Volkswagen Jetta SEL 2014 Chevrolet Corvette Stingray Hosts: Dan Roth, Steven Ewing, Chris Paukert Runtime: 01:34:21 Rundown: Intro and Garage - 00:00 Long-term WRX intro - 27:20 WRX Concept - 37:10 Lincoln MKC - 47:49 Corvette Z06 - 01:07:18 Q&A - 01:16:18 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 Rumormill Chevrolet Lincoln Mercedes-Benz Subaru subaru wrx concept

2016 Chevy Volt to make auto show debut this season

Ever since we saw that spy shots of the 2016 Chevy Volt, we've been hungering for more information on the next-gen version of GM's green halo car. It appears we might not have long to wait, at least for an official tease. An inside source that wishes to remain anonymous told AutoblogGreen that GM will make two announcements regarding the second-gen Volt at the CAR Management Briefing Seminars in Traverse City, MI next week. The first, and most intriguing, is that that we will get our first glimpse of the new Volt at some point during the upcoming auto show season. That means either Los Angeles later this year or else Detroit, Chicago or New York in early 2015. The second bit of news is that GM will be moving production of the electric motors from Mexico to Michigan. Details and official confirmation are, of course, missing and Chevrolet declined comment to AutoblogGreen. We should know more next week.