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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.

Domino's reveals Chevy Spark-based delivery car

Next time you order from Domino's Pizza, check out the delivery car. In an effort to get hot and fresh pizzas to hungry customers, the company is creating a small run of custom vehicles that are tailored for the job. Dubbed the Domino's Delivery Expert (DXP), these 2015 Chevrolet Spark-based hatchbacks pack a plethora of features to provide the perfect pie. When the DXP's on delivery duty, every order should arrive steaming hot thanks to the hatchback's biggest custom upgrade – a warming oven right behind the driver. Accessible from outside, it can keep pizzas at the perfect temperature on the way to your house and hold two of Domino's Heatwave bags. Other than the driver's seat, the rest of the interior also gets replaced with bountiful storage and non-slip surfaces. According to the company, as many as 80 pizzas could conceivably fit inside, and that would be quite a party. The exterior is still clearly derived from the Spark but with some clever additions. An illuminated "Out for Delivery" sign is on the roof, and a puddle light shoots the Domino's logo on the ground. Plus, the company's red-and-blue color scheme is emblazoned over the hood, pillars, and hatch. Underneath all the pizza-related mods, power comes from a 1.2-liter four-cylinder and CVT. Rather than just a one-off stunt, Domino's is working with Roush Enterprises and former General Motors exec Kenneth R. Baker to build 100 DXPs. They're hitting the streets in 25 US cities, and you can check if your locale is included on the project's website. The seed of this idea came from a partnership with Local Motors to crowdsource the ultimate pizza delivery platform. Domino's Launches Purpose-Built Pizza Delivery Vehicle Domino's Innovative DXP™ Created by Three Great Michigan Brands and an International Crowdsourcing Design Competition Ann Arbor, Mich., Oct. 21, 2015 -- In its latest innovation as the recognized world leader in pizza delivery, Domino's (NYSE:DPZ) is launching the Domino's DXP™ (Delivery Expert), a specially designed and built pizza delivery vehicle. The DXP is the combined brainchild of former GM R&D executive Kenneth R. Baker, Michigan-based Roush Enterprises and Domino's. To also include consumers' input, hundreds of concepts were initially identified in an online crowdsourcing design competition hosted by Local Motors. "The Domino's DXP is the first purpose-built vehicle aimed at revolutionizing pizza delivery," said Russell Weiner, president of Domino's USA.

Chevy Bolt-based prototype may be a Buick EV for China

Late last spring, we got a look at a GM prototype that was clearly based on the Chevy Bolt EV, but with updated styling. It seemed like it could be a more crossover-styled Bolt, given the recently trademarked name of EUV. Now we get another look at the prototype, but the bodywork seems less suggestive of a Chevy, and more of a Buick. This vehicle definitely still appears to be based on the Bolt, rather than on another small GM platform. In the photos of it next to the current model, the size, wheelbase and profile are extremely similar. There are differences, though. The nose isn't as sloped or as rounded, and the rear window kicks up a little earlier. The biggest changes are in the front and rear fascias, and it's here that we see hints of Buick. There are prominent air inlets on each side of the front bumper that give the car a more aggressive look. The headlights still have a fairly rounded, organic look, but with little extensions like fangs underneath. The styled running-light section, rounded shape and the smoked lenses seem very Buick-like. The grille features a large badge that doesn't fit the shape of a bow-tie, and is more that of a round logo like Buick's. Around at the back, the full-width taillights stand out, and in the middle there is obviously a round badge, again like a Buick. The wide taillights would also be a natural evolution of Buick's current light design language that uses somewhat wide and thin lights. The rear bumper has been redesigned with new lower taillights. Now that we've established that this seems very much like a Buick, we don't think we'll see this particular version offered here with the badge. This is more likely a Buick version of the Bolt for the Chinese market, where the brand is associated with luxury and has been the spearhead for GM's electric and hybrid models. In fact, the Chevy Volt hybrid was sold there as the Buick Velite 5, which was part of a family of a electrified Velite models. This would probably also carry a Velite badge as well. While we might not see this specific Buick variant, we probably will see it offered as a Chevy in some form. With its more aggressive, crossover shape, it could be the rumored EUV model. Or it could be just a refresh of the current Bolt, since the model has been largely unchanged since its introduction for the 2017 model year. And extrapolating from this prototype, we can see how the headlights could be tweaked to tie into those air scoops as on the Suburban and Silverado.