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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.

Chauffeur attacks motorist in road rage incident

A California man was the victim of an intense and violent road rage attack on the 405 freeway on Tuesday, but when the police were called they told the driver to shake it off. Shahnam Asbaghi told KTLA that the altercation began when a GMC Yukon private car began tailgating him. "This limousine Yukon driver was just tailgating me the whole time since when I got onto the 405 North," Asbaghi told reporters. "It was so bad I actually got scared and nervous so I exited early." When Asbaghi exited the freeway, the Yukon followed and rear ended him at the bottom of the ramp. "He just rammed me with his car at probably 25, 30 miles per hour," said Asbaghi. "When he hit me he got out of his car, came around to the driver's side and punched my window four or five times. Then he ran back to his car, got in his car, and drove away." Startled, Asbaghi followed his assailant in an attempt to get the Yukon's license plate number. After a quick chase, the Yukon stopped near Sepulveda Boulevard and Sherman Way where the driver got out of the truck, retrieved a long, unidentified item from the rear cargo area, and attacked Asbaghi's car again. Video shot by Asbaghi shows the chauffeur striking the driver's side window with the object, tossing it back in the Yukon, then leaving the scene. Asbaghi called 911, but the police weren't impressed. "Because my head wasn't smashed, because the window wasn't smashed, no harm no foul is what they told me," Asbaghi told KTLA. The cops did make the drivers exchange information, but no arrests were made. The Los Angeles Police Department is now looking into the incident to make sure they handled the situation correctly. The day after the attack, L.A. Private Car announced via Twitter that they fired the angry Chauffeur after reviewing the footage. News Source: KTLA Government/Legal Weird Car News GMC Driving Safety Crossover SUV Commercial Vehicles road rage 405 freeway chauffeur

GM planning to put its fullsize pickups on a big diet, too

General Motors is just coming off a complete redesign of the Chevrolet Silverado and GMC Sierra for 2014, but in the US fullsize truck market, there is no rest for the weary. According to Reuters, plans are already unfurling for both trucks to drop pounds from their curb weight over the next few years, but this will unlikely be able to keep pace with the 700-pound diet targeted for the next-generation Ford F-150, a truck expected to debut late next year.
The biggest weight reduction for these trucks might not be available until the next full redesign, which will likely happen around 2019, but the article says that smaller updates could shave pounds in the meantime. Two examples given include an "aluminum-intensive" version of the Silverado that could shed 250 pounds and debut around the same time as the lighter-weight, aluminum-bodied 2015 Ford, and there is also talk of reducing weight for driveline components such as axles and driveshafts. These changes are all part of an attempt to meet strict new fuel economy standards coming in 2017, targets which will get even tougher in 2025.