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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.

Chevy will reveal the Bolt EV tomorrow at CES

The moment that electric vehicle consumers and green propulsion enthusiasts have been waiting for is almost upon us, as Chevy confirmed that it will unveil the production version of the 2017 Bolt EV Wednesday at CES in Las Vegas. Chevrolet previewed the Bolt in concept form at the Detroit Auto Show almost a year ago, proposing a compelling rival to the likes of the Nissan Leaf and BMW i3. We've expected the CES debut for awhile, and Chevy projects that the finished product will boast a range of more than 200 miles on a single charge. That's nearly double the Leaf's range, and significantly farther than the i3 will travel even with the Range Extender kicking in. All of that for under $30,000 after federal tax credits. Of course, Chevy's own Spark EV costs much less, but will only go 82 miles before it needs to plug in again. If you won't be in Vegas for the unveiling tomorrow, you can catch it on Facebook. It will be the first vehicle to debut on the new Facebook Live, featuring both a live video stream and a 360-degree interactive interior video. Once out on the market, the Bolt EV will join the Spark EV, Volt PHEV, and Malibu hybrid in a growing array of electrified vehicles from the American automaker, rivaling the likes of Toyota and Nissan for the most electrified vehicles in its lineup. Chevrolet Bolt EV Will Debut at CES 2016-01-05 DETROIT – Chevrolet will unveil the 2017 Bolt EV at the International Consumer Electronics Show (CES) in Las Vegas on Wednesday, Jan. 6, and be the first auto brand to work with Facebook to debut a vehicle using Facebook Live. With the addition of the Bolt EV to a lineup that includes the all-new 2016 Volt, 2016 Malibu Hybrid and Spark EV, Chevrolet will offer consumers more affordable, electrified vehicle options than any other major automotive brand – solidifying its position as the leader in electrification. "The Bolt EV truly embodies the ingenuity that is at the core of everything we do at Chevrolet," said Alan Batey, president of General Motors North America and head of Global Chevrolet. "The technologies and the engineering expertise behind the Bolt EV are tremendous examples of the kind of innovation we intend to offer our customers, across an array of products at a tremendous value – something only Chevrolet can deliver." Building on the electrification expertise established by the Volt, the Bolt EV is a game-changing, long-range electric vehicle.

Chevy Bolt EV's battery shows big improvements over Spark's

Plug-in vehicle battery technology moves fast, and all you need to do to see this in action is to take a look at the new 60-kWh lithium-ion pack inside the 2017 Chevy Bolt EV. Well, you need to do that and then compare it to the battery packs inside of GM's other plug-in vehicles. And you don't even to go as far back as the EV1 to see progress. Let's start with what we know about the new Bolt's pack. It is supposed to drive the Bolt EV over 200 miles on a full charge. It weighs 960 pounds and is made up of 288 cells. Chevy's other all-electric car, the limited-availability Spark EV, had a 19-kWh pack and offered 82 miles of range. It had 192 cells and weighed 474 pounds. So, in the few years since the Spark EV was released, GM engineers have figured out how to get three times the energy capacity and almost two-and-a-half times more range out of a pack that weighs only about twice as much. And that doesn't even get to the price drops. GM has figured out how to get 3x the energy capacity and almost 2.5 times more range out of a pack that weighs only twice as much. Speaking of those 288 cells, that number might sound familiar to regular readers because that's exactly how many are in the new Chevy Volt. But the packs in the Volt and the Bolt are entirely different beasts. For one thing, while the Volt cells are made by LG Chem in Holland, MI, LG Chem will make the Bolt's cells in South Korea. The cell chemistries are also different. We spoke with GM engineer Tim Grewe (again) and while he declined to answer some of our Bolt battery pack questions until more details are unveiled at the SAE World Congress in April, he was able to explain a few things. "The cell inside the Chevy Bolt EV was specifically designed for EV range so it's up on energy," he said. "That's a different cell chemistry than on the extended range Chevy Volt, which is a smaller pack, smaller energy but more power per cell. We work with all of those vehicle requirements and customer demands and we say how do we meet this and we change the chemistry to make it all work." Comparing the 60 kWh in the Bolt and the 18.4-kWh pack in the Volt is really one of those apples to oranges issues, he said. "If you look at the Volt battery pack, how it went from where it was and where it's up to, from 38 miles to 50 miles, that was basic, overall industry improvement. Now, the 18 [kWh] to the 60 [kWh] is extended range vs. EV.