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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.

2021 GMC Terrain spied on GM's Proving Grounds

As the Chevrolet Equinox changes, so does the GMC Terrain. We saw shots of an updated Equinox not too long ago, and now our spy shooters have caught the GMC version of the crossover testing inside GM's Milford Proving Grounds. Similar to the Equinox, the Terrain is due for a mid-cycle refresh soon. Unfortunately, GM has this compact crossover covered up heavily to make sure we can't tell what's coming yet. The midsection of the vehicle remains the same as before, and we can even see the floating roof design outlined in the back by the camouflage. We imagine the majority of the changes will come up front with a new fascia including a different grille and headlight design. If it adopts the latest from the bigger Acadia, we'll be looking at a much more upright and butch-looking grille. That look descends from the full-size Sierra, though, so we'll see how much truck GMC wants to put in its small crossover. What will be most interesting of all is if GMC sticks to its guns with the wacky push-button shifter on the dash. The weird design has received mixed feedback, and this would be GMC's first big opportunity to respond. However, we expect most interior changes to be kept to a minimum, as this is only a mid-cycle refresh — GM completely redid everything for the full redesign in 2018. Additionally, we'll be interested to hear if the diesel will continue to be available as an option going forward. We'll likely see the refreshed Terrain sometime after the next Equinox is revealed. As it stands, this Terrain is probably a 2021 model year vehicle, and will be revealed at the tail end of this year, or in early 2020.

General Motors shaking up its marketing... again

One of the things that dogs the full comeback of General Motors is the instability of its marketing. That part of the automaker got yet another big shakeup today when GM confirmed what I have been tweeting for a few days - strong rumors that the Chevrolet and Cadillac ad accounts are walking to new ad agencies.
Cadillac, GM's luxury brand, is going into review from Fallon Worldwide, Minneapolis and the indications are that Campbell-Ewald, Chevy's old ad shop, will end up with most or all of it. C-E just announced that it was moving from its long-time home in Warren, MI to a new downtown Detroit office next to Ford Field, just blocks from GM.
The other shoe to drop shortly will be the shift of GM's most important brand, Chevy, from Goodby, Silverstein & Partners of San Francisco to McCann-Erickson of Troy, MI. McCann used to be the agency for Buick and GMC, as well as GM's corporate advertising, and has retained some pieces of business over the last few years. Sources have even told us that it was McCann that did a lot of the creative work on Chevy's new ad platform, Find New Roads. (Not to be confused with a former McCann tagline for Saab, "Find Your Own Road.")