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GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging

Auto Show Notebook: Legendary Continental name inspired Lincoln's designers

What's in a name? A lot for the Continental concept, and it gave Lincoln designers a sense of purpose as they styled the brand's upcoming flagship sedan. "The moment that we told them, it was amazing," Lincoln president Kumar Galhotra said. "They totally got it." "It" is cutting-edge technology wrapped in stately, large-sedan design. It's a nod to Lincoln's storied past, but a signpost for where the brand is heading. Though the Continental name dates to the late 1930s, Lincoln designers avoided making the concept overtly retro. "You can't let it pull yourself back too far in history, but you've got to design a car that lives up to the name," Galhotra said. Speaking to Autoblog on the floor of the New York Auto Show where the Continental formally debuted Wednesday, the Lincoln president reiterated that the car is on track to launch in 2016. It will compete against the Audi A6, Lexus GS, BMW 5 Series and other large luxury sedans. After its debut, the concept in New York will fly to China – another critical market for Lincoln – for display there. It will be replaced in New York by a prototype without an interior. The Continental is the latest high profile play by Lincoln to raise its image with consumers, who have either ignored or forgotten about it amid steep competition in the luxury sector from German and Japanese brands and a potentially resilient Cadillac. Lincoln sales are essentially flat compared with 2014 through the first quarter of this year, with total volume of 21,478 units. The middling start to 2015 comes on the heels of nearly 16-percent sales growth last year spurred by the launch of the MKC and the prominent signing of Matthew McConaughey to star in Lincoln advertisements. Other News, Notes & Quotes Speaking of names, Chevrolet did its homework before deciding to proceed with "Malibu" for its new generation of midsize cars. "We went out and researched it," said Alan Batey, president of General Motors North America. "People actually like the name 'Malibu,'" he said. Admittedly, the current Malibu has struggled in the marketplace against entrenched competitors, Batey said, but he's optimistic its awareness and historical value are assets to the dramatically redesigned sedan."The name's strong," he said. Meanwhile, in other Chevy news, the brand kicked off a new marketing campaign, "Real People, Not Actors" Wednesday. It will show consumers interacting with Chevys and their spontaneous reactions to the vehicles.

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.