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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

GM CEO Barra says 'we are selling every truck we can build'

DETROIT — General Motors Chief Executive Mary Barra said on Monday the automaker is "selling every truck we can build" and expanding North American truck-building capacity, even as U.S. gasoline prices hit record highs. Barra made her comments during the automaker's annual shareholder meeting. GM is pursuing a two-track strategy: Investing heavily in electric vehicles for North America, China and other markets, and funding those investments by trying to maximize profits from its North American combustion pickup truck and large SUV lineups. Barra said GM is planning higher-priced versions of its Silverado large pickup and its large SUV models. GM and its Detroit rivals Ford Motor Co and Stellantis NV rely heavily on sales of large pickup trucks and SUVs for global profits. High U.S. gasoline prices in the past have undermined consumer demand for relatively inefficient models. Nominal pump prices hit an average of above $5 a gallon for the first time ever last week, the federal government said Friday. GM is ramping up production of EVs. Barra said the Cadillac Lyriq electric sport utility is sold out through 2023. In response to shareholder questions, Barra said the "clear priority" for using cash generated by its operations is to "accelerate our EV plans." She did not rule out share buybacks or other approaches to returning cash to shareholders. GM still expects to increase production this year by 25-30%, despite continuing pressure on semiconductor supplies globally. Barra said GM is working to redesign vehicles to reduce the number of processors required by 95%. Barra serves as GM's board chair and CEO. GM shareholders overwhelmingly rejected a proposal to separate those roles.

Man spent $75 on a truck that lasted 38 years

Absurd as it is, some buyers today are worried about getting their car to last throughout the term of their seven-year car loan. Minnesota resident Bob Sportel has the opposite issue: his Chevrolet truck seemingly won't die. Sportel needed a cheap ride to get to work when he took a job at a farmer's co-op 38 years ago, so he bought a rusty 1957 Chevy pickup for $75 from a farmer; at the time, the 20-year-old truck was almost as old as Bob was. After nearly four decades of daily driving and an estimated 300,000 miles, Sportel is still driving the truck today. Bolts secure a fender, Bondo secures the lights, what looks like a whole roll of duct tape keeps him sitting on the bench seat instead of in it. For a 58-year-old pickup that's never seen a garage or a new coat of paint – but did get its oil changed four times a year – that's not bad; Sportel thinks his repair bill hasn't got above $1,000 for the entire time he's owned the truck. He still has no plans to get rid of it, saying, "It just becomes a part of you." You can watch his story in the video above. News Source: KARE11.com Chevrolet Truck Classics Videos