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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 Chevy Malibu helps parents monitor teen driver's performance

For teens, a driver's license can represent freedom. For parents, it can represent fear. Now there's a way parents can alleviate some of their worries and monitor their teen drivers. The 2016 Chevy Malibu, which debuted Wednesday at the New York Auto Show, contains a new feature that tracks driving performance and helps inexperienced drivers rein in some of their more dangerous habits. Accessed through a password in the car's infotainment system, parents can learn how far their child has driven, how fast they've gone and how many times they've braked hard, among other features. "It's an in-vehicle report card that gives parents information," says Mary Ann Beebe, one of the lead engineers who designed the system. "It's meant to be used as a teaching tool. Parents can sit down and talk with their teen about, 'Here are some areas where you're doing well, and here's some where you can use improvement.'" Car accidents are the leading cause of death for teens ages 16 to 19, and only last week, AAA released a study that found their driving behavior can leave them particularly susceptible to crashes. General Motors had sought ways to help educate and train younger drivers. In an era where data can be harvested from cars, monitoring performance is one way to provide information. Parents access the Teen Driver system in the car through a PIN-number entered into the Malibu's infotainment system. The report card can only be seen in the car – so far, it's not available via a smartphone app, like some other types of on-board diagnostic information. The system is activated by the use of a specially programmed key fob that lets the system know who is driving the car. Once the vehicle recognizes the key fob, it takes preventive measures to ensure safer conduct behind the wheel: Until the driver and front passenger buckle their seat belts, the radio is muted. Safety systems such as forward-collision assist and electronic stability control are automatically turned on. Parents can preset preferred speed limits, and drivers will hear a warning if that sound is exceeded. "We have these great technologies, and we want to make sure we turn them on for the teen," Beebe said. There are no geo-location aspects of the program, and data is stored on the car, not uploaded to the Cloud or even seen by General Motors, she said.

NHTSA ends GM steering investigation without seeking a recall

DETROIT — U.S. safety regulators have closed an investigation into sticky power steering on thousands of older General Motors SUVs and will not seek a recall. The National Highway Traffic Safety Administration says GM in 2014 issued “special coverage” to fix the problem on the Chevrolet Equinox, GMC Terrain and other models. The coverage replaced a steering gear with an improved one. The agency said a recall isn't needed because of the coverage and low complaint and warranty repair rates. The agency opened the probe in June of 2020 into steering problems affecting an estimated 781,000 of the SUVs from the 2010 through 2012 model years. Increased friction could make it feel like the steering wheel is stuck. But GM said the SUVs could still be turned, although with more effort than usual. “In view of the special coverage, low rate of failure and low potential hazard to drivers, this preliminary evaluation is closed,” the agency wrote in documents posted Wednesday on its website. Government/Legal Recalls Chevrolet GMC Safety