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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.

Top horsepower-per-dollar cars in 2017

Bang for the buck. That quasi-scientific statistic is bandied about by motor heads everywhere from classrooms to barrooms, though the truth of the matter is that it's exceedingly complex to measure. A fair performance-per-dollar index would include something like cross-referencing MSRP (Manufacturers Suggested Retail Price) with point-to-point times on a track or driving route, which is obviously hard to do comprehensively. But, for the sheer joy of talking about cars and playing with a big spreadsheet, there's always the horsepower-per-dollar index, which is more straightforward, albeit hilariously flawed. There are vagaries even with this simple formula, of course: MSRP for vehicles can change at a moment's notice, to say nothing of the bottom-line shifting that happens with local deals or showroom negotiation. For this list we're running with the straight MSRP wherever possible, and as recently reported as we can get it. All the vehicles on this list are 2017 models, and all trims are reported where the lowest price and differing power levels intersect. Some choices were made for personal preference and some for sanity, avoiding things like all 48 trim levels of the Ford Transit, all with the same horsepower). If this list were a simple top ten, or even a top fifty, you'd be bored to tears with all the red, white and blue that is represented. Following perfectly with conventional wisdom, American cars really do lead the world where hp/$ is concerned. So, for the sake of variety (and the sheer joy of seeing a minivan 'win' one round of this thing) I've sorted out some top five and bottom five lists for broad power categories. Let's dive in. Less Than 100 Horsepower Okay, okay, this is hardly a category we'll grant you. But we've often tried to click off all the sub-100-hp cars on sale in the US, and making this list gave us an excuse. It also illustrates that none of these smallish vehicles bring cheap horsepower to the table - for that you'll need a motorcycle. The segment-leading Chevy Spark (above) asks just over $139 for each hp, and that Smart Fortwo Electric Drive has hp on sale for about the same price as its very distant family cousin, the Mercedes-Benz SL65 AMG (insert your favorite Smart joke here... we know you want to).

Chevy Malibu Hybrid wins 2016 Connected Green Car of the Year

From the Washington Auto Show today, Green Car Journal's Ron Cogan announced three different fuel-efficient vehicle awards. They were: 2016 Connected Green Car of the Year: Chevy Malibu Hybrid 2016 Luxury Green Car of the Year: Volvo XC90 T8 2016 Green SUV of the Year: Honda HR-V The Volvo was nominated in two categories, but it did not win the Connected Green Car of the Year. Speaking of non-winners, the other green SUV finalists were the BMW X1 XDrive28i, Hyundai Tucson, Mazda CX-3, and Toyota RAV4 Hybrid. The other Luxury Green Car finalists included the BMW x5 xDrive40e, Lexus RX 450h, Porsche Cayenne S E-Hybrid, and the Mercedes-Benz C350e. Finally, the Audi A3 e-tron, BMW 330e, Toyota Prius, and Volvo XC90 T8 were the runners up for Connected Green Car. 2016 Connected Green Car of the Year, Green SUV of the Year, Luxury Green Car of the Year Winners Announced WASHINGTON, Jan. 21, 2016 /PRNewswire/ -- Green Car Journal has announced the winners of its prestigious 2016 Green Car Awards at a press conference held today during the Washington Auto Show's Public Policy Day in Washington DC. Distinguished as 2016 Luxury Green Car of the Year™ is Volvo's new XC90 T8. The Chevrolet Malibu Hybrid tops the field as 2016 Connected Green Car of the Year™ and Honda's HR-V earns Green Car Journal's 2016 Green SUV of the Year™. "These are stand-out vehicles in an increasingly sophisticated and appealing field of 'green' cars," said Ron Cogan, editor and publisher of Green Car Journal and CarsOfChange.com. "To make the cut as a finalist is a real achievement in itself considering the considerable competition in the market today. Rising to the top as award winners means these three exceptional vehicles set a benchmark in the auto industry's effort to create vehicles that are desirable and efficient, while also achieving environmental milestones so important for our driving future." The Green Car Awards are a key feature of The Washington Auto Show, the "public policy show" on the auto show circuit and one that puts a priority on safety and sustainability. "We are extremely proud of our partnership with Ron Cogan, whose eagerly anticipated suite of awards help shape the national conversation on the innovations that will drive our industry and country forward," said Geoff Pohanka, chairman of The Washington Auto Show.