on 2040-cars

Auto blog

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.

2021 Jeep Grand Cherokee L vs Big Three-Row Crossovers | Spec comparison

The three-row 2021 Jeep Grand Cherokee L is here, entering an ever-growing segment of big crossovers that Jeep has ignored since the Commander of the late 2000s. Of course, the Dodge Durango has basically been a three-row version of the current Grand Cherokee with Dodge styling and a different interior, so it's not like The Corporate Entity Formerly Known as Chrysler has been without a contender in the segment. Jeep is a stronger brand than Dodge, however, and the three-row midsize segment is stronger than those with two rows (there's a vast sales difference between the Chevrolet Traverse and Blazer, as well as the Honda Pilot and Passport). In other words, the Grand Cherokee L could be a very big deal. It is also, quite literally, a very big deal. As you're about to see, it is now the largest three-row crossover, besting the length, wheelbase and height of even the gargantuan Traverse. There's more to the story than that, however, so we put together the below comparison chart to show you how the new Grand Cherokee L lines up on paper versus the biggest three-row crossovers. That includes the 2021 Ford Explorer, 2021 Kia Telluride, 2021 Hyundai Palisade and 2022 Chevrolet Traverse. This group also represents some of the strongest entries in the segment as well as those we feel are most likely to be considered alongside the big Jeep. To that end, we also included the 2021 Lincoln Aviator in the chart since its base price is actually less than what we anticipate the luxurious, range-topping Grand Cherokee L Overland and Summit trim levels to start.  Engines and drivetrains Note the differences in curb weight here. The Grand Cherokee L has the highest base curb weight of the group apart from the high-lux Aviator, yet its 3.6-liter V6 has the least amount of power and torque. Therefore, it'll be surprising if it's not the slowest in the group. There's of course the Hemi V8 available on the top Overland and Summit trim levels, but again, a hefty curb weight works against it. At 5,330 pounds, the lightest V8-powered JGCL weighs 600 pounds more than V6-power Explorer Platinum and ST models. On the other hand, nothing can touch the Hemi Jeep's towing capacity, and only the 400-hp Aviator betters the Jeep's base V6. Its 6,200-pound towing capacity greatly outdoes the 5,000-pound limits of not only the Telluride, Palisade and Traverse, but most others in the segment as well.

Someone has already test driven the 2016 Chevy Volt

Due to some well-placed connections at General Motors Canada headquarters in Oshawa, a senior member of the gm-volt.com forum with the handle "kickincanada" got about 30 minutes behind the wheel of a 2016 Chevrolet Volt. Kickincanada owns a 2012 Volt, and other than personal reservations over the styling of the new car, he came way nothing but impressed by the second-generation hybrid. He drove the Premier trim, posted his observations on the site, then answered questions for other owners desperate to find out what's coming. He said the interior materials are "more upscale," there is less hard plastic and better leather, the seats are more comfortable, and ergonomically, "Everything is beautifully laid out." Although obviously not as luxurious, the interior reminded him of the Cadillac ELR. Tech touches like a better display, Apple integration, a wireless charging area for the phone, heated rear seats, and a better rear console were also worth noting. As for driving, Kickincanada called it "incredible." The "much more luxurious drive" comes courtesy of a "firm and sporty" suspension setup, less NVH thanks to more sound insulation, quieter Michelin Energy Saver tires, and quieter operation of the genset ICE. He said acceleration from a standstill felt quicker because there was no delay between applying the throttle and the car taking off. He estimates owners should be able to get about 100 kilometers (62 miles) out of the electric mode alone on a full charge, and that the new Volt is "clearly improved in almost every way" (the car's official range, as determined by the EPA, is 53 electric miles). We look forward to finding out ourselves. Click through to gm-volt to read all of his thoughts and responses if there's a hybrid purchase in your future. Related Video: