1971 Chevrolet Chevelle on 2040-cars

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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.

2015 Chevy Volt gets larger battery, though range remains the same

The Chevrolet Volt isn't changing much for the 2015 model year. According to specifications uncovered by Inside EVs, though, the new Volt's battery does have a slightly larger capacity. According to the spec sheet, this doesn't translate to increased range. Real world driving, though, might tell a different story. The 2015 Volt's battery storage is slightly higher than the outgoing model's, up from 16.5 kilowatt-hours to 17.1 kWh. According to GM's manager of electrification technology communications, Kevin Kelly, speaking to Green Car Reports, the increased capacity is "a late change done in the cell... just another continuous improvement to surprise and delight our customers." The stated electric range, however, stays at 38 miles. Inside EVs followed up on its original report, and found that drivers could see some advantage to the battery tweak. When they spoke to Kelly, he told them, "As a result of this change, we would expect that some customers may see a slight improvement in overall EV range." It's worth noting that when battery capacity increased from 16 kWh to 16.5 kWh for the 2013 Volt, electric range increased by three miles to the current 38, while MPGe went from 94 to 98. The price of the 2015 Chevrolet Volt remains steady, at $34,995. The actual cost to the customer is considerably less with the $7,500 federal tax credit, as well as any local incentives.

Chevy preparing new Camaro ZL1 Convertible?

It's a given that when an automaker introduces a new performance model, it's only a matter of time before an even hotter variant arrives. The Ford Mustang begets the Shelby GT350 and the Dodge Challenger R/T spawns the SRT 392 and Hellcat. And for Chevrolet, that progression sees the Camaro SS evolve into the ZL1. That's probably what our spies have captured here. The convertible variant of GM's most powerful Camaro is betrayed not by its big, black wheels or quad exhaust tips – both of those items have been fitted to the far tamer 1LE in the past – but by its brakes. To put it simply, they're enormous. The old ZL1 had 14.6-inch rotors in front and 14.4-inchers in the back, with Brembo-branded six-piston calipers up front and four-piston binders at the rear. While the overall size of the calipers doesn't appear to have changed much, it looks like the rotors – especially in front – seem to take up a larger space inside the front wheels than in last year's model. Perhaps Chevy moved to a straight 15-inch rotor? It's difficult to discern any more from these images, though. Chevy did a fine job with the camouflage, making it difficult to pick out ZL1-specific body parts. From the rear spoiler to the front fascia to the side sills, each body piece looks like it's the same as the standard Camaro or is just completely obscured. If this is a Camaro ZL1, it seems like Chevy may have just stuffed the vital organs inside the body of more pedestrian droptop. According to our spies, it's unlikely that Chevy will mix things up under the hood. Expect the 6.2-liter, supercharged V8 from the Corvette Z06 and Cadillac CTS-V to move the ZL1 from 550 horsepower to around 640 ponies when it debuts for model year 2017. A six-speed manual transmission will be standard, while the Camaro's big brother will probably donate its eight-speed automatic. Related Video: Image Credit: Brian Williams / SpiedBilde Spy Photos Chevrolet Convertible Performance chevy camaro zl1