2011 Drw Denali (4wd Crew Cab 167.7 Drw Denali) Used Turbo 6.6l V8 32v Automatic on 2040-cars

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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.

Submit your questions for Autoblog Podcast #313 LIVE!

We record Autoblog Podcast #313 tonight, and you can drop us your questions and comments regarding the rest of the week's news via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
Discussion Topics for Autoblog Podcast Episode #313
2014 Chevrolet Silverado and GMC Sierra introduced

2019 GMC Sierra interior looks just like the Silverado's

The GMC Sierra has pretty much always been a Chevy Silverado in disguise. There was maybe some fancier trim plus the availability of the ritzier Denali trim, but the differences mostly amounted to different makeup on identical twins. As we can see from the spy photos above, the yet-to-be-shown 2019 GMC Sierra will actually have a more distinctive exterior, but the interior will continue the me-too tradition. Immediately apparent is the fact that the whole dashboard is carryover. It's the same chunky, plasticky place to be that, while likely highly functional, did little to impress when unveiled at the Detroit Auto Show. Really, only the volume, tuning and climate control knobs look different from those in the Silverado. They appear to have a different ridged pattern on the edges, and are possibly a shinier, glossier finish. The steering wheel also looks different, with a chunkier center and more svelte spokes. The Sierra exterior would seem to be better differentiated. The headlights are very different in that they wrap around the fenders more so than on the Chevy. The grille looks more vertical and aggressive than the Silverado's. The wheel arches also differ in that the forward corners are rounded and the rears are more squared off. The GMC Sierra will be revealed March 1 in Detroit. As per usual, it will probably share all of its powertrain bits with the Silverado. That means at least 5.3- and 6.2-liter gasoline V8s and the new turbocharged 3.0-liter inline-six diesel engine. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.