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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.

GM recalling 426,000 sedans over faulty transmission shift cable

General Motors is recalling some 426,240 sedans that may have a faulty transmission shift cable, according to a National Highway Traffic Safety Administration report this morning. The recall concerns a fault within four-speed automatic transmissions equipped on 2007-2010 Saturn Aura models, and 2008-2010 Chevrolet Malibu and Pontiac G6 models.
The report specifies that tabs on the transmission shift cable may fracture and separate. Such a fault could cause a discrepancy between the actual position of the transmission and the apparent position of the shift lever.
GM is currently working to notify owners of the vehicles in question, and dealers will check and replace shift cables free of charge. Scroll down to read the complete NHTSA report.

Jeff Gordon to pace Indy 500 in Corvette Z06

The Chevrolet Corvette has served as pace car for the Indianapolis 500 more than any other vehicle in the century-long history of the race. And this year it'll be at the front of the pack again in the form of the Corvette Z06 driven by Jeff Gordon. With 650 horsepower on tap, the Z06 is among the fastest, most powerful cars ever to serve as pace car for the Greatest Spectacle in Racing – right up there, at any rate, with the ZR1 that led the field in 2012 and the Viper GTS from 1996. For this year's race, it's been decked out in white with special graphics, strobe lights and a red interior. The 99th running of the race will mark the 13th time a Corvette has been tapped for the honor. Gordon, a name better known to NASCAR fans, but certainly no stranger to the track, will handle driving duties. The four-time Sprint Cup champion has won the Brickyard 400 no less than five times, including the very first time it was held back in '94. No driver has won at Indy more than Gordon – a record he shares with Michael Schumacher, who won the US Grand Prix there five times. (AJ Foyt, Al Unser and Rick Mears share the record for Indy 500 victories at four apiece, in case you were wondering.) It'll be a busy Sunday for Gordon, who will also be competing in the Coca-Cola 600 at Charlotte on the same day. Jeff Gordon to Drive Corvette Z06 Indy 500 Pace Car Five-time Brickyard winner will lead pack for 99th running of the Indianapolis 500 2015-04-29 INDIANAPOLIS – Five-time Brickyard 400 winner and four-time NASCAR Sprint Cup champion Jeff Gordon will drive a Corvette Z06 pace car for the 99th running of the Indianapolis 500 mile race, May 24 at the Indianapolis Motor Speedway. It is the 13th time a Corvette has served as the official pace car, dating to 1978, and the 26th time a Chevrolet has led the pack for "The Greatest Spectacle in Racing." Corvette has served as the pace car more than any other vehicle in the race's history. Gordon, who grew up in nearby Pittsboro, Ind., is no stranger to the Indianapolis Motor Speedway. In 1994 he won the inaugural Brickyard 400 – the first-ever NASCAR race at the Brickyard, and has visited the winner's circle there four more times. That makes him one of only two five-time winners at Indy in any series. Michael Schumacher won five Formula One races there. "It's great to have Jeff Gordon serve as this year's pace car driver," said Jim Campbell, Chevrolet U.S. vice president of performance vehicles and motorsports.