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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.

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.

2021 Chevy Silverado, GMC Sierra fuel economy to go down due to global chip shortage

Production of the 2021 Chevy Silverado and 2021 GMC Sierra is continuing, but the global semiconductor chip shortage is resulting in a mid-year change. Or rather, an omission.  Basically, the availability of cylinder deactivation for the 5.3-liter V8 will be significantly reduced, resulting in a reduction of 1 mpg combined for affected models. This applies whether that engine has the six- or eight-speed automatic, as well as to both the regular Active Fuel Management and the more advanced Dynamic Fuel Management cylinder deactivation systems. DFM does remain with the pairing of 5.3-liter V8 and 10-speed automatic that comes standard on the LT Trail Boss and High Country. "Due to the micro controller shortage, the components that control AFM/DFM in the engine control module (ECM) have been removed," GM spokesperson Michelle Malcho told Autoblog. She also indicated that the engines will still have the AFM/DFM hardware in place, but that GM will not allow activation of the systems in the future with an ECM change.  Malcho also confirmed to Autoblog that the Silverado and Sierra's other engines will continue to have AFM and DFM, including the 2.7-liter turbo inline-four, 4.3-liter V6 and 6.2-liter V8. In an earlier statement to Reuters, she declined to say the volume of vehicles affected. "By taking this measure, we are better able to meet the strong customer and dealer demand for our full-size trucks as the industry continues to rebound and strengthen," Malcho wrote Reuters in an email. The change runs through the 2021 model year, she said. Malcho told Reuters it would not have a major impact on the Detroit automaker's U.S. corporate average fuel economy (CAFE) numbers. "We routinely monitor our fleet for compliance in the U.S. and Canada, and we balance our portfolio in a way that enables us to manage unforeseeable circumstances like this without compromising our overall (greenhouse gas) and fuel economy compliance," she said. GM's fleetwide fuel economy in the 2018 model year was 22.5 miles per gallon and was projected to rise to 22.8 mpg for 2019, according to a report by the Environmental Protection Agency. To meet federal CAFE requirements, automakers like GM often use credits from either earlier years where they faced less stringent rules and performed better than the requirements or buy credits from other automakers. GM said last month the chip shortage could shave up to $2 billion from this year's earnings.