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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 Tahoe gets Police Patrol Vehicle treatment

That was fast. Mere days after showing a Police Concept based on the 2015 Tahoe at the SEMA Show, Chevrolet has announced that it will build a PPV model based on the SUV to do battle with the Ford Police Interceptor Utility (Explorer) and Dodge Durango Special Service.
You'll recall that the Tahoe has been police staple for several years, predating both the Explorer and Durango police variants, so the fact that the new model would spawn a police variant is hardly surprising. Like the civilian model, the 2015 PPV benefits from a more efficient 5.3-liter, direct-injection V8 that pumps out 355 horsepower and 383 pound-feet of torque. It also features more high-strength steel, offering better crash protection, on top of optional safety items like lane departure warning, forward collision alert and a Safety Alert Seat.
The press release is rather light on police-specific items, aside from the auxiliary battery, which keeps the myriad of electronics in a modern police car running even when the engine isn't. Lightbars, 17-inch steel wheels on Goodyear Eagle RS-A tires and a push bar round out the mods for the Tahoe PPV. The cabin features a revised center console and room for laptop and other equipment mounts.

Autotrader picks best cars for 2015's college grads

Summer is here and the school season is winding to a close. That means millions of students will be graduating college and (hopefully) entering the workforce. For many, that will mean buying a new car suited to the new stage in life into which they will now be embarking. That can be a bewildering choice, especially for someone who's never bought a car before. Fortunately, Autotrader has come up with a short list of recommended cars – new and used – which it recommends to the graduating class of 2015. Among the site's top choices are some compelling crossovers and hatchbacks, including the Buick Encore, Chevy Trax, and Jeep Renegade, as well as the Honda Fit, Nissan Versa Note, Mazda3 and Fiat 500. Can't stretch to buying new, or don't see the point? Autotrader has also identified the Toyota Camry, Ford Fusion and even the Lexus IS as smart buys in the certified pre-owned category. "Any time someone goes through a major life change, such as graduating college, they need to determine if their current ride makes sense for their lifestyle, from both a financial and functional perspective," says Autotrader editor Brian Moody. "For example, while that hand-me-down SUV from your parents was nice when you turned 16, you may want to opt for a safer, more fuel-efficient car as you transition into the working world." Autotrader Names 10 Best Cars for Recent College Graduates ATLANTA, May 28, 2015 /PRNewswire/ -- For many, graduating college is a milestone like no other – it represents a new chapter, a proud accomplishment and, fortunately or unfortunately, financial independence. Luckily for graduates who are in the market for a new car to suit their post-college lifestyle, Autotrader's expert editors say now is a great time to make a purchase, as dealerships are flush with affordable models that are fun, fuel-efficient and thoughtfully designed. Autotrader Logo "Any time someone goes through a major life change, such as graduating college, they need to determine if their current ride makes sense for their lifestyle, from both a financial and functional perspective," said Brian Moody, site editor for Autotrader.