2017 GM/Isuzu L5P Duramax rated at 445 hp/910 lb-ft

[kscarbel2]

Truck Trend  /  September 24, 2016

The ever-escalating diesel horsepower and torque race appears it’s in full force, if figures found on the GM Powertrain site are any indication.

Technically, the site is in the public domain, but is generally only visited by dealers.

We were able to get a screen grab of the figures before GM had a chance to pull them down.

As you can see, the figures for the next-generation L5P 6.6L Duramax V-8 are clear to see – 445 hp at 2,800 rpm and 910 lb-ft at 1,600 rpm.

This gives the L5P a 5 hp edge over the 2017 Super Duty’s 6.7L Power Stroke, and 15 lb-ft less peak torque. But being this close to 1,000 lb-ft, who’s counting?

This temporarily puts Ram third in the torque race, a position it once held in first place with 900 lb-ft.

So far, GM has revealed a new two-path intake system for the L5P, allowing it to ingest greater quantities of air. We now know that extra air has been used to good effect. The only other information revealed in the powertrain guide is that the 103 x 99 mm bore and stroke dimensions and 16.0:1 compression ratio remain. We’ll have to wait until next week for specs such as peak boost.

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[kscarbel2]

GM's 2017 heavy duty diesel trucks to get 910 lb-ft of torque

Auto Blog  /  September 24, 2016

According to Truck Trend, GM's newest heavy duty pickup trucks will pick up quite a bit more power and torque. The publication spotted a recent GM Powertrain ordering catalog that had the engine specs for the 2017 model year and managed to get some screenshots before the catalog was taken down, and they can be viewed here.

The screenshots revealed that the 6.6-liter turbodiesel V8 powering the Silverado and Sierra heavy duty models will boast 445 horsepower and 910 lb-ft of torque. This is a substantial gain over the current models' 397 horsepower and 765 lb-ft of torque, and as Truck Trend points out, it exceeds the Ford Super Duty line's horsepower output of 440, but comes short of the 925 lb-ft rating.

Truck Trend credits part of this output gain to the new intake system GM will introduce on the 2017 heavy duties. The intake gets 60 percent of its air from a scoop on the hood, with the other 40 percent coming from behind one of the front fenders. GM doesn't reveal horsepower figures in the press release about the scoop, but it does say the cooler air helps with maintaining the engine's output, and that the scoop does produce a ram-air affect, providing more air at speed. As we know, more air plus more fuel equals more power, but there's likely more to the power increase in this engine than only the intake.

[kscarbel2]

GM packs more pickup into diesel V8

Automotive News  /  September 29, 2016

The heavy-duty versions of the 2017 Chevrolet Silverado and GMC Sierra pickups will be available early next year with a new version of the 6.6-liter Duramax V8 turbodiesel that is the most powerful engine General Motors has ever offered in its pickups.

GM said today the new Duramax engine is rated at 445 horsepower and 910 pounds-feet of torque, up from 397 hp and 765 lbs.-ft. in the outgoing 2016 models.

The new engine escalates a heavy-duty pickup arms race.

In July, Ford announced a power increase for its 2017 Powerstroke diesel V8, raising output to 440 hp and 925 lbs.-ft. of torque. Ram, with an aging inline six-cylinder diesel engine supplied by Cummins, offers a version of its engine that makes 385 hp and 900 lbs.-ft. of torque.

GM offered to journalists limited test drives of the new engine ahead of tomorrow’s opening of the State Fair of Texas here, which could draw between 2.5 million and 3 million attendees. GM will be displaying the 2017 Silverado HD with the new engine on its stand.

Sandor Piszar, director of Chevrolet truck marketing, said GM bumped up the torque, not because it wants to outgun Ford or other competitors but to make the truck more useful and less stressful for customers who haul heavy loads.

“We’re shooting for towing confidence,” he said. For highway passing, the new engine reduces acceleration time from 50 mph to 70 mph by 1.5 seconds when towing a 10,000-pound trailer. Without a trailer, it can reach 0 to 60 mph in 7.1 seconds.

New engine

Gary Arvan, Duramax chief engineer, said 90 percent of the engine is new.

It keeps the current engine’s bore spacing -- the distance between the pistons -- and short stroke, which enables GM to retain the expensive production equipment used to build the Duramax engine in its Moraine, Ohio, plant. But nearly every other system, from the oil pan to the fuel injectors, has been re-engineered and “designed to produce more torque at lower rpm,” said Arvan.

Arvan said the revamped Durmax engine has three unique features:

• Remelted piston bowl rims: The center section of each aluminum piston is heated up again after casting. That changes the molecular structure of the aluminum, making it better able to withstand heat.

• A venturi jet drain oil separator: It filters oil mist out of the blow-by gases and returns the oil to the sump.

• Closed loop glow plug temperature control: It uses sensors to manage the glow plugs to provide instant starts in cold weather.

Other changes to the Duramax include:

• A new, stronger block, redesigned aluminum cylinder heads and a new crankshaft with improved bearing surfaces;

• A new fuel system, with proprietary GM controls; and

• An electronically controlled turbocharger mounted between the cylinders.

The new engine will also have a visual signature: a hood scoop that feeds cool, dry air into the intake system, helping the engine produce more power under heavy loads. Only Duramax-equipped trucks will have the scoop.

GM has sold more than 2 million vehicles with the Duramax V8 engine since introducing it in 2001 under a joint venture with Isuzu. Horsepower and torque have increased with each new iteration, growing from the original 300 hp and 520 lbs.ft. of torque.

Arvan said the new version of the Duramax produces 35 percent less oxides of nitrogen, or NOx, and will only need minor emissions systems revisions in the coming years to stay ahead of toughening clean air standards.

[Dirtymilkman]

How much is enough?!

[RoadwayR]

I hear this engine will likely be offered in the GM/Navistar joint venture medium duty conventional.  At least the Chevy version.

[kscarbel2]

Redesigned Duramax 6.6L Diesel Offered on 2017 Silverado HD

Trailer/Body Builders  /  October 4, 2016

Chevrolet announced the redesigned Duramax 6.6L V-8 turbo-diesel offered on the 2017 Silverado HD. This next-generation redesign offers more horsepower and torque than ever — an SAE-certified 445 horsepower (332 kW) and 910 lb.-ft. (1,234 Nm) — to enable easier, more confident hauling and trailering.

Along with a 19 percent increase in max torque over the current Duramax 6.6L, the redesigned turbo-diesel’s performance is quieter and smoother, for greater refinement. In fact, engine noise at idle is reduced 38 percent.

“With nearly 2 million sold over the past 15 years, customers have forged a bond with the Duramax diesel based on trust and capability,” said Dan Nicholson, vice president, Global Propulsion Systems. “The new Duramax takes those traits to higher levels.”

The new Duramax 6.6L shares essentially only the bore and stroke dimensions of the current engine and incorporates a new, GM-developed control system. The Duramax’s signature low-rpm torque production hasn’t changed and still offers 90 percent of peak torque at a low 1,550 rpm and sustains it through 2,850 rpm.

“Nearly everything about the Duramax is new, designed to produce more torque at lower rpm and more confidence when trailering or hauling,” said Gary Arvan, chief engineer. “You’ll also notice the refinement improvements the moment you start the engine, and appreciate them as you cruise quietly down the highway — with or without a trailer.”

Additional highlights include:

• New, stronger cylinder block and cylinder heads
• New, stronger rotating and reciprocating assembly
• Increased oil- and coolant-flow capacity
• New EGR system with single cooler and integrated bypass
• New electrically actuated/electronically controlled turbocharging system
• All-new advanced solenoid fuel system
• All-new electronic controls
• New full-length damped steel oil pan that contributes to quietness
• New rocker cover/fuel system acoustical treatments
• B20 bio-diesel compatibility
• SAE-certified 445 net horsepower (332 kW) at 2,800 rpm
• SAE-certified 910 net lb.-ft. of torque (1,234 Nm) at 1,600 rpm

A new, patent-pending vehicle air intake system — distinguished on the Silverado HD by a bold hood scoop — drives cool, dry air into the engine for sustained performance and cooler engine temperatures during difficult conditions, such as trailering on steep grades. Cooler air helps the engine run better under load, especially in conditions where engine and transmission temperatures can rise quickly. That allows the Duramax to maintain more power and vehicle speed when trailering in the toughest conditions.

The intake design is another example of the advanced integration included in the 2017 Silverado HD that makes it over-the-road capable.

As with previous versions, the new Duramax block features a strong cast-iron foundation known for its durability, with induction-hardened cylinder walls and five nodular iron main bearings. It retains the same 4.05-inch (103mm) and 3.89-inch (99mm) bore and stroke dimensions as the current engine, retaining the Duramax’s familiar 6.6L (403 cu.-in./6,599 cc) displacement.

A deep-skirt design and four-bolt, cross-bolted main caps help ensure the block’s strength and enable more accurate location of the rotating assembly. A die-cast aluminum lower crankcase also strengthens the engine block and serves as the lower engine cover, while reducing its overall weight.

The new engine block incorporates larger-diameter crankshaft connecting rod journals than the current engine, enabling the placement of a stronger crankshaft and increased bearing area to handle higher cylinder loads.

An enhanced oiling circuit, with higher flow capacity and a dedicated feed for the turbocharger, provides increased pressure at the turbo and faster oil delivery. Larger piston-cooling oil jets at the bottom of the cylinder bores spray up to twice the amount of engine oil into oil galleries under the crown of the pistons, contributing to lower engine temperature and greater durability.

A new, two-piece oil pan contributes to the new Duramax’s quieter operation. It consists of a laminated steel oil pan with an upper aluminum section. The aluminum section provides strength-enhancing rigidity for the engine, but a pan made entirely of aluminum would radiate more noise, so the laminated steel lower section is added to dampen noise and vibration.

There’s also an integrated oil cooler with 50 percent greater capacity than the current engine’s, ensuring more consistent temperatures at higher engine loads.

[kscarbel2]

GM's redesigned Duramax diesel

Fleet Owner  /  October 17, 2016

The new redesigned 6.6-liter Duramax V-8 turbocharged diesel engine from General Motors offers 19% more torque than its predecessor along with 38% less noise at idle as well. The engine is also lighter and quieter due to the wider use of aluminum in its construction.

Slide show - http://fleetowner.com/equipment/gms-redesigned-duramax-diesel#slide-0-field_images-203531