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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 announces six new recalls, covering 3.5 million vehicles

General Motors has just initiated another crushingly large recall, this time affecting some 3.36 million vehicles built between 2000 and 2014 and sold in the US, Canada and Mexico. Once again, the issue surrounds the cars' ignition switches, which can be kicked out of the run position if they're carrying extra weight or if they experience a "jarring" event. In this particular case, though, GM will modify the keys, rather than the ignition itself.
A four-by-six-millimeter hole will be drilled into the key, which will more safely accommodate the weight of the key ring. As is usually the case, the work will be done free of charge. The recalled vehicles include the 2000 to 2005 Cadillac Deville, 2004 to 2005 Buick Regal LS and GS, 2004 to 2011 Cadillac DTS, 2005 to 2009 Buick Lacrosse, 2006 to 2008 Chevrolet Monte Carlo, 2006 to 2011 Buick Lucerne and 2006 to 2014 Chevrolet Impala. Only the Impala is still in production, and even then, it's only sold to fleet companies.
According to an official statement from GM, there have been eight crashes and six injuries due to this latest issue. As if this isn't a dire enough blow for GM, the company has announced five smaller recalls, covering 165,000 vehicles.

Diesel engine will be a no-cost option on 2021 Cadillac Escalade

Pricing for the redesigned 2021 Cadillac Escalade was revealed yesterday, with the various trim levels ranging from $77,490 to $101,290 including $1,295 destination. And while we also learned that all-wheel drive will be a $3,000 option, what's surprising is that the optional 3.0-liter inline-six diesel engine will cost $0, this according to official pricing info released by Cadillac. The diesel is one of two engine choices for the new 2021 Escalade, the other being a 6.2-liter V8. The engine also is coming to the 2021 Chevrolet and GMC full-size SUVs, but it's not yet known what the upcharge will be there, if any. Already, the 3.0-liter I6 diesel is offered in the Chevy Silverado and GMC Sierra 1500 pickups, where it is currently a $2,500 option over the 6.2-liter V8. The Duramax inline-six turbodiesel is an aluminum-block design with dual overhead camshafts and a single, variable-geometry turbocharger. Cadillac quotes preliminary outputs of 277 horsepower and 460 lb-ft of torque. The 6.2-liter V8, meanwhile, musters 420 horses and the same torque output. The primary draw for the diesel is expected to be fuel economy. EPA estimates for the diesel engine in the Escalade (and in the GMC and Chevrolet full-size utes) have not yet been released. But in the pickup trucks, the engine returns 23 city/33 highway miles per gallon with rear-wheel drive and 23/29 mpg with four-wheel drive. The 2021 Cadillac Escalade had been scheduled to reach dealerships this summer, but it's not known whether that date might slip due to the current shutdown at GM's assembly plants. Related Video: