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Our favorite mid-engine Corvette theories and rumors

The mid-engine Corvette! We just saw blurry photos through the foliage, and are hearts are all aflutter because it means that this car is real. And it's the most " never before" Corvette since 1984. Which leads us to all kinds of wacky theories and speculation. Everybody knows something or heard from a guy. None of those guys (or gals) from GM are talking to Autoblog, to be clear. But that won't stop us from stirring the pot. Let's go over a few point-by-point. The pushrod engine will be replaced by an overhead-cam V8 Car and Driver has repeatedly reported that an overhead-cam engine will come after the mid-engine Corvette's debut with an old-school pushrod. We've heard the same thing firsthand, albeit from a source with no connection to the development of the Corvette or powertrain. "At some point two valves can't pass future emissions regulations," said the guy we know. While the pushrod engine is compact, the design makes it difficult - if not impossible - for sophisticated variable valve timing (and lift) systems that control combustion with more precision. Hasty conclusion: The pushrod engine has a finite life in front of it. This one's a lock, it's a just a matter of when. Bowling Green's new paint shop is really the mid-engine assembly line Credit to Reddit for this one. Like we said, everybody knows a guy. But let's look deeper. The new paint facility costs $439 million dollars and adds 450,000 square feet, almost half the size of the existing plant. Plus GM announced another $290 million in upgrades at Bowling Green Assembly. That sure sounds like a lot of money, but you can actually spend that much on a paint booth. Porsche spent 500 million Euros (about $561 million dollars) to add the Macan assembly to its Leipzig, Germany plant in 2014. Chrysler shelled out $850 million for a paint shop in Sterling Heights, Michigan. GM spent $600 million for a new paint shop at the Fairfax (Kansas City) plant. Honda, on the other hand, is working on a thrifty $210 million project in Marysville, Ohio that includes a 300,000 square foot expansion, and the low-volume Acura NSX facility only cost $70 million. Hasty conclusion: The square footage and cost could easily mean a new assembly line instead of (or in addition to) a paint line. And if the NSX plant was really that cheap, GM could have hidden a similar sum in its existing announcements.

GM sees 'strong year' in 2018, then gold in Chevy Silverado for 2019

DETROIT — General Motors said on Tuesday it expects earnings in 2018 to be largely flat compared with 2017, but that profits should pick up pace in 2019 as its revamped line of high-margin pickup trucks hits the U.S. market. The 2018 earnings outlook was above market expectations, sending GM shares up more than 3 percent in premarket trading. "GM had a very good 2017 as we continued to transform our company to be more focused, resilient and profitable," GM Chief Executive Mary Barra said in a statement. "We are positioned for another strong year in 2018 and an even better one in 2019." GM and its Detroit rivals, Ford and Fiat Chrysler Automobiles, are bringing on new trucks at a time when overall U.S. new vehicle sales have been falling, but truck sales continue to grow as consumers abandon passenger cars in favor of pickups, SUVs and crossovers. GM on Saturday fired a new round in the battle for profits from one of the U.S. auto industry's most lucrative segments when it showed a new generation of its Chevrolet Silverado pickup truck at the Detroit auto show. The new Silverado, a highlight of the event, is the successor to GM's best-selling vehicle in North America. Sales of the current Silverado rose nearly 2 percent to 585,000 vehicles in 2017. In the coming months, the company will also reveal a revamped GMC Sierra pickup truck. U.S. new vehicle sales fell 2 percent in 2017 after hitting a record high in 2016, and are expected to drop further in 2018 as interest rates rise and more late-model used cars return to dealer lots to compete with new ones. GM said on Tuesday that while it retools a factory in Ft. Wayne, Indiana, to make the new pickup trucks, it will shift some production to an Oshawa, Ontario, plant in order to avoid missing sales in a hot market for the vehicles. The No. 1 U.S. automaker said it will record a $7 billion non-cash charge for its fourth-quarter 2017 earnings related to deferred tax assets. GM said it expects capital expenditure in 2018 of around $8.5 billion, about $1 billion of which will go toward funding self-driving car technology. Last week, the company said it is seeking U.S. government approval for a fully autonomous car — one without a steering wheel, brake pedal or accelerator pedal — to enter the automaker's first commercial ride-sharing fleet in 2019. GM said it expects 2017 earnings per share at the high end of its previously forecast range of $6 to $6.50.

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