2021 Silverado: Diesel Duramax Is The Only Engine You Should Get

Silverado: It's what's under the hood that counts.

Last week GM announced that it would not be producing any more Duramax diesel engines for the rest of 2021. A lot of folks were bummed, both the workers and execs at GM and everyone whose hearts have been captured by the the most recent Duramax iterations.

The good news is that 2022 isn't really that far away, and September is the season when we begin to see next year's cars and trucks being unveiled. Even so, we have automotive journalists continuing to write about the vehicles we love, even if we can't own them yet because of parts shortages.

Along these lines Business2Community.com published a story by Nigel Atkinson about the 2021 Chev Silverado 1500 and its Z71 Duramax diesel engine. Atkinson gushes over this engine like a schoolboy worshipping his first love.

The first paragraph notes that the Silverado's competitors --  Ram 1500 and Ford F-150 -- had interior features that make the Silverado feel "cheap." Nevertheless, when it comes to trucks, it's what's under the hood that counts. And for Atkinson, the 3.0-liter Duramax turbodiesel inline-six with 4WD is "the only option you should ever choose." Its 277 horsepower and 460 pound-feet of torque in conjunction with a smooth 10-speed transmission... who could ask for anything more?

What does a high-tech diesel engine look like today? The Duramax has an aluminum block and cylinder head, twin overhead camshafts, and four valves per cylinder. "I uses a variable-geometry turbo which can adjust the boost pressure based on load, as well as an electronically controlled variable-flow intake manifold. These various features work together to maximize and maintain peak performance, especiall with regards to torque.  

Even though the 6.2-liter V8 delivers the same torque numbers, the Duramax produces power more efficiently, resulting in significant fuel savings. Atkinson said that in the course of a week he averaged nearly 22 mpg, much betterthan the 13.2 mpg in a Trail Boss with the 6.2-liter V8. The greener footprint (i.e., less CO2) is also noteworthy. That benefit alone should turn some heads.

On pavement the Silverado handles just fine and due to noise-cancelling features it doesn't rattle like the old diesels. The truck had trouble with certain kinds of road undulations, though for the most part it handled fine. This shortcoming was not due to the engine but rather to the suspension. When pulling out into traffic it good to know you have some oomph. The truck does 0 to 60 in 7.1 seconds.

Off road the Z71 package is very capable. Skid Plates, Twin Tube Shocks, Hill Descent Control, a 2-speed Transfer Case, Heavy Duty Air Filter and All Terrain Tires are part of this package.

Atkinson and team took to the trails in the Laguna Mountains, east of San Diego and just north of the border, so close that the Border Patrol is active in these parts. With humps and ruts, it's an ideal terrain for testing ground clearance and handling. 

After tackling Thing Valley Road, they went up to the twistier Sheep Mountain Road. The suspension did its job, as did the 4WD traction while climbing uphill. The low 4WD gear coming downhill worked great. 

As noted earlier, the interior was nothing fancy. It's not a luxury truck. The designers evidently focused on being functional. 

After detailing all the bells and whistles (and other options) Atkinson wrote that if it weren't for that turbo-diesel option, he would not recommend the Silverado. After putting it to the test for a week, he's changed his tune. "The motor," he states, "is absolutely brilliant."

Kudos to Chevy for what they have achieved with this engine and transmission. And even though it costs a little more, it's worth it. Or as Atkinson says, "It is money well spent." 

Here's a link to the full article, with photos.
https://www.business2community.com/automotive/2021-chevrolet-silverado-1500-z71-duramax-review-the-diesel-is-the-only-engine-you-should-get-02429584

Duramax Diesel Engine Production Halted for the Rest of 2021

Photo courtesy GM Authority

It's been a rough year for automakers, but especially for GM. Semiconductor shortages have hit all of the Big 3 automakers, causing production disruptions. GM seems to had more than its share of woes. 

In August we wrote about how strong the demand has been for diesel trucks, though at the end of this article we referenced a temporary halt to production that was announced. That ominous warning evolved quickly to a more serious concern, as GM was forced to change its tune. The temporary parts shortage will impact the engine more than initially expected. The temporary parts shortage would have a bigger impact on the engine than initially expected.

Last week news broke that production had been halted for the rest of the year on its 3.0L LM2 GM Duramax diesel engine. The article does not explain where the derailment took place. Rather it takes advantage of the bad news to remind us of its features and applications.

The LM2 Duramax diesel is assembled in Flint, Michigan. It has been one of the options for their full-size half-ton pickups and full-size SUVs. These would include the Chevy Silverado 1500, GMC Sierra 1500, Chevy Tahoe, Chevy Suburban, GMC Yukon and Cadillac Escalade.

If you ever attend the SEMA Show in Las Vegas, you'll find that GM is not only proud of its cars but also of its engines. The engines are set on pedestals in the massive booth  that historically sprawls in the center of the main hall. They're impressive.

According to the story in GM Authority, "The LM2 engine features a straight six configuration with a DOHC valvetrain, 84mm bore, and 90mm stroke, with a 15.0:1 compression ratio. The block and heads are made of aluminum, with a forged steel crankshaft and forged rods. The pistons are made from hypereutectic cast aluminum alloy, while the cylinder liners are made from iron."

The halting of Duramax diesel engine production wasn't GM's first black eye this year. In July GM announced a recall for 410,019 trucks due to faulty roof rail airbags. The problem was related to moisture issues that might cause the inflator end cap to detach from the inflator, or cause the inflator to rupture. The 2015-2016 Chevy Silverado 1500 and Chevy Silverado HD, as well as the 2015-2016 GMC Sierra 1500 and GMC Sierra HD were the model years impacted. 

All this safety equipment can be a blessing when you need it. For manufacturers dependent on suppliers, it's just one more thing that can go wrong. In addition to an army of laborers, they are required to have a battalion of lawyers as well.

You will find the full story here.

Enjoy the holiday. We'll be back tomorrow.