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'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).

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 struggles to sell small cars, plans to lay off 2,084 employees at two plants

Due to low demand for some of its vehicles, General Motors plans to cut 2,084 jobs at its assembly plants in Lordstown, OH and Lansing, MI. At the same time, the automaker also announced plans to invest approximately $900 million in three of its facilities – the Toledo Transmission Operations in Ohio, Bedford Casting Operations in Indiana, and Lansing Grand River in Michigan - for future products. GM will discontinue the third shift at both the Lansing Grand River plant and the Lordstown, OH plant. The Cadillac ATS, Cadillac CTS, and Chevrolet Camaro are made at the automaker's plant in Michigan, which currently has 2,700 employees. The move to eliminate the third shift affects 810 hourly workers, as well as 29 salaried employees, starting on January 16th. The plant in Lordstown, OH currently has 4,500 employees and makes the Chevrolet Cruze sedan. The plan to discontinue the third shift will affect 43 salaried workers and 1,202 hourly employees and will start on January 23rd. As Fortune points out, sales of the Cruze are down 20 percent through October, while sales of the Cadillac ATS and CTS were down 17 percent through the same period of time. In addition to cutting the third shift at both assembly plants, the automaker plans to invest a total of $900 million between three of its facilities for unnamed future products. GM's Toledo Transmission Operations will receive $667.6 million, the Lansing Grand River Assembly plant will receive $211 million, and the automaker's Bedford Casting Operations will get $37 million. Last year, GM cut roughly 500 jobs from its Orion Township factory due to slow sales of the Chevrolet Sonic and Buick Verano, with surging crossover and SUV sales as the most likely culprit. With GM posting much healthier sales figures for the Chevrolet Equinox and Cadillac XT5 compared to the ATS, CTS, and Cruze, it looks like compact SUVs are to blame for this year's layoffs as well. Related Video: News Source: Fortune, General MotorsImage Credit: REUTERS / Rebecca Cook Hirings/Firings/Layoffs Plants/Manufacturing Cadillac Chevrolet GM Coupe Sedan Lordstown Ohio