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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.

Weekly Recap: Volvo buys Polestar, makes performance a priority

Volvo is taking its performance business in-house, and the Swedish carmaker announced Tuesday that it bought tuning company Polestar, which has long been known for producing sporty Volvos. The move allows Volvo to ramp up its performance business, and it plans to increase Polestar-branded vehicle sales to 1,000 to 1,500 annually, up from the 750 total projected for this year. The companies have been working together on motorsports projects since 1996. Financial terms of the sale were not released, and Polestar workers will move over to Volvo. Former Polestar owner Christian Dahl will keep control of the Polestar racing team and operate it under a new name. In addition to sales volume, Volvo has ambitious plans for other parts of Polestar, including its aftermarket business. Volvo also said it will use its twin-engine hybrid technology for Polestar models in the future, though specifics and timing were not revealed. Meanwhile, Volvo announced it will offer a run of 265 total Polestars in the United States for the 2016 model year, with S60 and V60s available. "Driving a Volvo Polestar is a special experience. We have decided to bring this experience to more Volvo drivers, placing the full resources of Volvo behind the development of Polestar as the model name for our high performance cars," Volvo CEO Hakan Samuelsson said in a statement. OTHER NEWS & NOTES 2016 Chevy Silverado, GMC Sierra, get nose jobs Automakers tend to refer to light updates as 'facelifts,' and that's exactly what Chevy gave the 2016 Silverado and GMC Sierra. Chevy slightly changed the front end of the truck. Using the one photo released of the new Z71 model as a guide, we can see that the headlights went from a stacked vertical design to single bulbs, and they are set on top of LED running lights. The grille has more body-colored elements instead of shiny metal, and the hood has a new line running down the middle (look really closely). The design theme will be similar across the portfolio, though materials and details will vary, a spokesman said. Some models, like the High Country and LTZ will have more chrome, and the LEDs are only for the upper trims. Chevy also said it will use the eight-speed automatic transmission on more versions of the Silverado, and it updated the MyLink feature to support Android Auto and Apple CarPlay.

GMC and EarthCruiser to collaborate on Hummer EV Pickup overlander project

GMC just announced a collaboration with overlanding vehicle builder EarthCruiser, and the end result is going to provide us with a co-developed Hummer EV Pickup. The photo you’re looking at above is the first teaser for whatÂ’s to come of the partnership. The Hummer team will be working with EarthCruiserÂ’s research and design division to develop an overland upfit solution for EVs that it says will initially be integrated into the Hummer EV Pickup. In case you werenÂ’t familiar with EarthCruiser, theyÂ’re the people that have made utterly wild overlanding vehicles like the Terranova, FX and EXP. Needless to say, EarthCruiser makes some pretty rad stuff, and none of it is cheap. GMC says this collaboration will look to use EarthCruiserÂ’s expertise gained from developing its vehicles to create an overlanding solution for the Hummer. We should expect to see EarthCruiserÂ’s engineering technologies integrated into the vehicle, which will allow the Hummer to go even further off-road and provide the ability for owners to live with their trucks in the wilderness.  The one snag with overlanding in EVs is the typically long journeys away from civilization. As an example, the EarthCruiser XP and EXP feature 60-gallon fuel tanks to ensure you can get to where you need to go and power the living situation for a long time once youÂ’re there. WeÂ’ll be interested to hear what GMC and EarthCruiser have to say about the challenges presented by overlanding in an EV. Already visible in the teaser image is what looks like a solar panel-filled roof and rear side pods for supplies. The concept truck will be presented in late summer 2023, and while no date for a production vehicle was provided, itÂ’s likely that the final truck will come soon after. Related video: