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How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.

Opel pulls out of Russia, GM to focus on Cadillac, 'iconic' Chevys

General Motors is going to realign its priorities in the struggling Russian marketplace, withdrawing its Opel brand and pulling out mainstream Chevrolet models. Instead, the General will take aim at Russia's well-established oligarchy, pushing Cadillac as well as "iconic" Chevrolet models, like the Corvette, Camaro and Tahoe. "This change in our business model in Russia is part of our global strategy to ensure long-term sustainability in markets where we operate," GM president Dan Ammann said in a statement. "This decision avoids significant investment into a market that has very challenging long-term prospects." Russian customers interested in an Opel or mainstream Chevys like the Spark, Aveo (the US market Sonic), Cobalt (shown above), Cruze, Orlando and the like have until December to snap up a car before the brands are pulled. "We do not have the appropriate localization level for important vehicles built in Russia and the market environment does not justify a major investment to further localize." Opel Group CEO Karl-Thomas Neumann said. GM will continue to offer service to customers in Russia. "We can assure our customers that we will continue to provide warranty, parts and services for their Chevrolet and Opel vehicles," Neumann said. Beyond realigning its brands in Russia, GM also announced that it would also be idling the company's factory in the country's second-largest city, St. Petersburg. This is the second time the St. Petersburg factory has been in the news – GM announced that it'd be idled for roughly two months back in February. Scroll down for the official press release from GM. GM to Change Business Model in Russia 2015-03-18 Focus on Cadillac and iconic Chevrolet vehicles Wind down Opel brand and sale of mainstream Chevrolet cars Idle GM Auto manufacturing facility in St. Petersburg Part of GM's strategy to ensure long-term sustainability in global markets DETROIT – General Motors today announced plans to change its business model in Russia. GM will focus on the premium segment of the Russian market with Cadillac and U.S.-built iconic Chevrolet products such as the Corvette, Camaro and Tahoe. The Chevrolet brand will minimize its presence in Russia and the Opel brand will leave the market by December 2015. "This change in our business model in Russia is part of our global strategy to ensure long-term sustainability in markets where we operate," said GM President Dan Ammann.

How real is the Chevy Bolt EV and will it really cost $30,000?

"This is us bragging that we can do this kind of car." That's how Michael Simcoe, GM's executive director for NA exteriors, described the Chevy Bolt EV concept, which made a surprise appearance at the Detroit Auto Show today. While there was talk of a 2017 production debut, this is for sure a concept vehicle. But that means the ideas behind the vehicle are perhaps more important than the details. For example, no one is talking about what size battery might appear in a production Bolt, but Simcoe would talk about how rapid progress in battery improvements made it possible for GM to make the bold Bolt declaration that promises 200 miles and a price tag of around $30,000 (after incentives). But if the Bolt makes it to market, it won't be until 2017 (as rumored) or later, is it really fair to promote the car as being available with a federal tax credit? For one thing, credits for plug-in vehicles may change in the next few years, but if the laws stay the same, each manufacturer is limited to 200,000 vehicles before the credits start to decline. GM is justifiably proud that it's sold over 70,000 Volts thus far, but with a new model coming out later this year and a few years to go until the Bolt potentially arrives, GM could be pushing right up against that 200,000 limit when the Bolt goes on sale. But Volt executive chief engineer Pam Fletcher told AutoblogGreen that, "We're just trying to take some of the confusion out." "Think about talking to the average consumer," she said. "First, going through the explanation of how the federal tax credit was set up, how it's being used and so on. [In the industry, we] have the luxury of understanding the nuances of that regulation, but right now people who aren't in the marketplace, they don't have the luxury of all that. It's already hard to communicate the details so we gave them data in a way that is what they're used to seeing." There was one question that drove the two-year Bolt gestation and design period, Simcoe said: What does a better battery offer a vehicle designer? "We've got a number of spaces we play in for powertrain technology and obviously electrification is one of them," he said. "With Volt 1 and then the Spark EV, with that development and batteries getting better for us, we started doing some practical packaging to deliver a vehicle which was not the traditional aero form which you see around electric vehicles.