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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.

GM to idle car production at five factories as Americans continue CUV love affair

In case you needed another reminder that Americans have fallen out of love with sedans, General Motors today announced plans to idle five factories in January in a bid to cut its inventory to 70 days. Detroit-Hamtramck Assembly ( Buick LaCrosse, Cadillac CT6, Chevrolet Volt and Impala) and Fairfax Assembly in Kansas ( Chevy Malibu) will stop production for three weeks. Lansing Grand River ( Cadillac ATS and CTS, and Chevy Camaro) is going down for two weeks, while Lordstown, OH ( Chevy Cruze) and Bowling Green, KY ( Chevy Corvette) will go idle for a week each, Automotive News reports. GM's shutdown reflects a broader problem with the company's supply – at 847,000 vehicles, the company's supply increased unsteadily from a low of 629,000 units in January of 2016. That's more than a 25 percent increase in the past year. Citing information from Autodata, The Detroit News reports that at the end of November, GM had a 168-day supply of LaCrosses, 177 days' worth of Camaro, 170 days of Corvette, 121 days for Cruze, 119 days for ATS, 132 days for CTS, and 110 days of CT6. Meanwhile, inventory of the company's more popular vehicles is actually below the professionally accepted 60- to 70-day supply, The News reports. The Trax, Colorado pickup, and GM's full-size SUVs are sitting below 50 days and experiencing year-over-year sales increases. GM needs a rethink of its inventory levels, which is something that's apparently coming. "We're going to be responsible in managing our inventory levels," GM spokesman Jim Cain told The News. Another unnamed spokesman told Automotive News the company's day-to-day supplies would "fluctuate before moderating at year-end." But at least one analyst thinks this won't be the last time Detroit needs to stop production to level things out. "Incentives are elevated, residuals are declining, and rates are rising," Brian Johnson, an analyst with Barclays, told The News. "And while GM in particular may benefit in the months ahead from new product launches, it's important to recognize that GM's inventory is elevated at the moment, and it wouldn't surprise us if they need to announce another production cut – which could pressure the stock." Related Video: News Source: The Detroit News, Automotive News - sub. req.Image Credit: Paul Sancya / AP Plants/Manufacturing Buick Cadillac Chevrolet GM GMC Crossover SUV Sedan bowling green cadillac xt6 fairfax

Here's why automakers roll out those Texas-themed pickup trucks

Every year, automakers with a full-size truck link make a big show of the Texas State Fair, usually involving a reveal of a new model. Sometimes they show a whole new truck, and other times a special edition centered on the Lone Star state. While some people might write this off as a quirk of the industry, others might be wondering, "What's the big deal with Texas?" As it turns out, part of the big deal with Texas is big truck sales. According to Dave Sullivan, product analysis manager at AutoPacific, Texas buys more trucks than any other state in the country. It's not a small margin either. Edmunds.com, one in five trucks sold in the US are sold in Texas. The state also accounts for 15 percent of the country's large truck sales, which is more than twice that of California, the second largest truck market in America. Even when you break down sales only in Texas, trucks are a huge piece of the pie - Sullivan says that a quarter of new vehicle sales in Texas are trucks. One in five trucks sold in the US are sold in Texas. But it's not just sales that make truck builders give attention to Texas. As Sullivan explained, "Pickups are life in Texas." Both he and Hugh Milne, marketing and advertising manager for the Chevy Silverado line, said that trucks are key fixtures in Texas society, as both work trucks and luxury vehicles (or Texas Cadillacs as Milne called them). Milne said Texas is so important in the truck market that if you want to be successful in the rest of the country, "you've got to be successful in Texas." As for the State Fair, it has become a prime location for reveals in part because of the importance of the Texas market and because of how big the fair is. Milne also revealed that the State Fair also hosts its own auto show, so it's an ideal venue for a vehicle introduction. So there you have it. Why do truck builders obsess over Texas? It's because Texas obsesses over trucks. When you have one market that loves your product that much, you give it the attention it deserves. Related Video: Image Credit: Donovan Reese via Getty Images Auto News Marketing/Advertising Chevrolet Ford RAM Truck f-150 texas state fair