2007 Chev Silverado 5.3 Auto Air on 2040-cars

Auto blog

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.

Callaway debuts its new C7 Stingray at National Corvette Museum

Callaway showed off its first tuned version of the 2014 Corvette Stingray at the National Corvette Museum last week, giving the rampant enthusiasts of America's sports car a look at the roughly 620-horsepower, supercharged rocket.
Unlike the Corvette SC610 we showed you back in January, this Stingray packs a fair bit more oomph. Horsepower is only up ten ponies, but torque has jumped from 556 pound-feet to "at least" 600 pound-feet. Neither horsepower nor torque is official quite yet, although Callaway is expecting to know just what its creation can do once testing and validation is completed later this month.
The 6.2-liter, supercharged V8 now boasts a new, three-element intercooler, which Callaway claims only allowed the inlet air temperature to increase by ten degrees Fahrenheit during dyno runs. Previous designs saw a 35-degree-Fahrenheit jump. The exhaust system has also been fettled with, and now is even less restrictive.

Most of the US won't get 2016 Chevy Volt

Every major plug-in vehicle launch in the US has been a patchwork operation, with automakers focusing their initial efforts on targeted locations like California where they expect to sell the most units. Today, we learned that even five years into the plug-in car project, the game remains the same. According to GM, the second-gen Chevy Volt is going to be rolled out in the same manner. In fact, GM is limiting availability of the 2016 model year Volt so much that most of the US will not have access to the car at all. For 39 states, the second-gen Volt will first be available as a 2017 model year vehicle at some point in the spring of 2016. When GM announced the buying process for the new Volt, it made it clear that dealers in California would be the first to place their orders. Hybrid Cars now reports that the first deliveries will be also limited to California and 10 other states that follow the California Air Resourced Board (CARB) rules: Connecticut, Massachusetts, Maryland , Maine, New Hampshire, New Jersey, New York, Oregon, Rhode Island, and Vermont. GM spokesman Kevin Kelly told AutoblogGreen that this is all according to plan. "Chevrolet has a shortened model year for the 2016 Chevy Volt that will have a limited distribution network," he said. "The 2016 Volt will be sold in our strongest EREV markets. The 2017 Chevrolet Volt will begin production early this spring and will be available throughout the country." It appears that non-CARB state Volt customers will be able to order their Volts starting October 1, according to documents posted on Hybrid Cars, where we also learn that 2016 Volt production for California started in August, will begin in late October for the other 10 CARB states, and in early 2016 for the rest of the US. Unsurprisingly, dealers outside of the 11 CARB states have been complaining that they can't order the much-anticipated new Volt for their customers just yet. Related Video: