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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.

Junkyard Gem: 1986 Chevrolet Sprint Plus

General Motors sold second- and third-generation Suzuki Cultuses with Geo or Chevrolet Metro badging in the United States from 1989 through 2001 model years, and we've all seen plenty of those cars on the street over the years. The first-generation Cultus was sold here as well, with Chevrolet Sprint badges, and I've found a rare example of the Sprint five-door hatchback in a Northern California car graveyard. The Chevy Sprint first appeared on the West Coast as a 1985 model, then became available everywhere in the United States for the 1986 through 1988 model years (in Canada, it was sold as the Pontiac Firefly). It was available here as a hatchback with three or five doors; for 1986 only, the five-door was badged as the Sprint Plus. Soon enough, The General would be selling many more Asian-built cars with Detroit badges here. Isuzu I-Marks were sold as Chevrolet/Geo Spectrums starting in the 1986 model year, while Daewoo provided the Pontiac LeMans two years later. Under the hood, a 1.0-liter three-cylinder rated at 48 horsepower. The five-door Sprint cost $5,580 in 1986, which was $200 more than the three-door (those prices would be $15,445 and $14,891 in 2023 dollars). I've documented seven discarded Sprints prior to this one (including an extremely rare Turbo Sprint), and all of them were three-doors; we can assume that price was the most important factor for Sprint buyers. Gasoline prices were crashing hard during the middle 1980s, but memories of gas lines and odd-even-day fuel rationing from 1979 remained strong. What cars competed with the '86 Sprint on sticker price? Well, there was no way to undercut the hilariously affordable (and terrible) Yugo GV, which cost $3,990. The much bigger (but still pretty bad) Hyundai Excel listed at $4,995, while Toyota would sell you a sturdy (but zero-fun) Tercel starting at $5,448. Even the wretched Chevy Chevette — yes, it was still available in 1986 — cost $5,645. The original buyer of this car was willing to shell out an extra $395 to get an automatic instead of the base five-speed manual. That's about $1,093 in today's money. This car must have been slow. By the end, the doors were held shut with duct tape, but it still stayed alive until age 37. 53 miles per gallon on the highway! It does everything. The camels of the highway.

First 2015 Chevy Corvette Z06 engine blows up at just 891 miles

You've waited and watched and waited some more for the arrival of your 650-horsepower, $78,000 Chevrolet Corvette Z06. Finally, that joyous day arrives and you eagerly, but gingerly, begin to break-in the 6.2-liter supercharged V8 monster under your hood. Then 900-odd miles after delivery, your excitement grinds, quite literally, to a halt. That's what the owner of one 2015 Z06 claimed happened to him when a simple break-in drive resulted in a lunched engine. The owner, known as Lawdogg149 on Corvette Forum, says he was out breaking-in his car ahead of a January track event when it happened. "While making a pull from 35 miles per hour, I accelerated and shifted short of redline, and boom - the car began knocking. I pulled over and popped the hood. I could hear a loud knock coming from the No. 6 cylinder area along with a serious, grinding, metal-on-metal sound coming from the supercharger area," Lawdogg wrote. A subsequent trip to the dealer confirmed his concerns, with the service facility telling Lawdogg that the No. 6 valvetrain had failed. The dealer couldn't research the issue further, though, as General Motors requested the engine be returned for a more thorough evaluation. The good news for the Z06's unlucky owner, at least, is that GM will be covering the engine replacement under warranty, an expense that Corvette Forum estimates is a nearly $24,000 procedure. At this point, the two leading theories behind the engine's detonation involve a manufacturing defect – which could be why GM is so keen to tear the blown powerplant down – or a mistake on the part of Lawdogg. As Motor Authority points out, such an error could be something as simple as the Z06's owner accidentally shifting to first rather than third during his 35-mph pull. If, however, there's a deeper manufacturing problem with the Z06's engine, this might not be the only case we end up hearing about.