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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.

New GM subcompact SUV spied, could be a Chevy or GMC

GM's pair of subcompact crossovers have been trundling along for a while now. The Buick Encore was the first for Americans in the 2013 model year, and the Chevy Trax that was based on the Encore (an encore of the Encore, if you will) arrived for the 2015 model year. Each has undergone a mild update, but these spy photos could indicate their replacements are in the works. Or not. For starters, we can't be sure which GM brand this new SUV is destined for. Though the timing and its flowing lines could indicate Buick, the thick horizontal bars visible in the grille would indicate otherwise. The next Encore being at least related to this is at least a possibility. Making the case for GMC are those thick grille bars, the fact that it extends far below the lights, and may even rise above them, similar to the Acadia. And that rising beltline isn't that different from that of the Acadia. Arguing against the GMC idea is the Encore, which is almost always sold in GMC-Buick combo dealers. Much as the Acadia was made smaller to eliminate confusion and in-house competition with the Enclave, it's hard to see GM opting to resurrect such an issue at the bottom end of the SUV market. That means we're leaning toward this little SUV wearing a Chevy bowtie. The split grille with a large lower section and small upper section is the brand's current design language, as seen on the new Malibus and Cruzes. The shape is vaguely Equinox-like. And like Buick, Chevy also has a subcompact crossover ready for replacement: the Trax. Now, our photographer reports he's seen another subcompact testing that has Blazer design cues, but in this crossover-hungry market, we wouldn't be surprised if two similarly sized but differently styled Chevy crossovers make the grade. It's a strategy that's working pretty well for Jeep. We'll no doubt be seeing more of these disguised test vehicles milling about the country in the coming months, so perhaps we'll eventually get a better idea of what this is before more official information starts trickling out within one or two years. Related Video: Featured Gallery GM Subcompact Crossover spy shots View 10 Photos Image Credit: SpiedBilde Spy Photos Buick Chevrolet GM GMC Crossover SUV buick encore chevy trax

Expect greater differentiation in GM's next-generation SUVs

General Motors says its next-generation Chevrolet Tahoe, Suburban, GMC Yukon and Cadillac Escalade models will offer shoppers improved interior differentiation. Car and Driver recently caught up with Chris Hilts, GM's creative manager of interior design, who said that the cabins will all feature unique instrument panels, consoles, center stacks and switchgear moving forward. Apparently GM is now aware that consumers may be bothered by the fact that today's $85,000 Escalade has effectively the same cabin as a $45,000 Tahoe. Hilts says SUV buyers want more refinement than their pickup purchasing counterparts - and those same buyers also want their SUVs to have more exterior differentiation between the company's Silverado and Sierra pickup lines. Shocking.
That all sounds good to us, but we've heard this song and dance before. GM made big waves about how different the new-for-2013 Silverado and Sierra would look from each other, but judging by what we've seen so far, GM's stylists are painting in shades rather than with the full spectrum. For more on the what to expect out of GM's new SUVs, click on the C/D link below.