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PONTIAC, MICH. - GM's Duramax 6600 6.6L turbo-diesel V-8 engine will provide higher power and torque ratings and major emission improvements beginning in January 2004.

Silverado and Sierra 2500HD and 3500 Series trucks with the Duramax 6600 and the Allison automatic transmission will receive a new version of the engine with 310 hp @ 3100 rpm, 10 more horsepower than before. The engine also features a higher torque rating of 590 lb-ft @ 1600 rpm, a 70 lb-ft increase over its previous maximum high. At the same time, Duramax 6600 NOx emissions have been reduced almost by half.

"Since its introduction in 2001, the Duramax 6600 has re-established GM in the full-size diesel powered truck market by increasing our share of the segment to nearly 30 percent," said Charlie Freese, executive director, diesel engineering for GM Powertrain.

Silverado and Sierra models with the Duramax 6600 and a standard ZF S6-650 six-speed manual transmission receive the same emissions improvements as those with the Allison 1000, with carryover power ratings.

"Over 90 percent of our three-quarter and one-ton customers order their Duramax 6600 with the Allison 1000 five-speed automatic transmission - prompting us to focus on power, torque and emissions improvements, where they provide greatest benefits for the largest number of customers," Freese said.

Both the new version of the Duramax 6600 turbo diesel with the Allison automatic transmission and the version with the standard ZF six-speed manual feature improved hardware. The new version also has additional software calibration changes to help provide its higher power output.

Primary hardware changes include a variable nozzle turbocharger, new electronic control module, next-generation fuel injectors, electronically controlled cooled exhaust gas recirculation (EGR), 50 state catalytic converter usage, improved charge air-cooling and a closed crankcase ventilation system:

The common rail fuel system also uses smaller, more precisely machined and positioned next-generation fuel injectors to inject its fuel pulses into the cylinders. The injectors are now fully accessible, allowing service technicians to access them without having to take the cylinder head cover off. Servicing is typically required only every 100,000 miles or more.

The new variable nozzle turbocharger features vanes that are now hydraulically controlled to precisely adjust the level of boost generated by the turbocharger.

A more powerful, 32-bit, next-generation engine control module provides the capabilities for integrated control of the additional engine hardware. The new engine controller provides faster microprocessor speeds, increased throughput and more memory than the previous generation controller.

The EGR system in conjunction with catalytic converter usage reduces NOx emissions in all 50 states to approximately 2 grams per brake horsepower hour from a previous 4 grams in 49 states and 3.5 grams in California.

Charge-air cooling is used to provide cool dense air to the cylinders to help generate the new engine's increased power, torque and improved emissions.

The closed-crankcase ventilation system, although not required to meet 2004 emissions regulations, anticipates upcoming 2006-model emissions requirements by incorporating a closed crankcase ventilation system in which harmful vapors are vented internally and burned as part of the combustion process, rather than being vented to the outside atmosphere.

"The engine's high torque across the power band helps Duramax 6600-equipped GM trucks excel in off-the-line performance, acceleration and heavy-duty trailering and hauling," Freese said.

New versions of the Duramax 6600 will be produced at GM's Moraine, Ohio facility. The engine was developed through a GM and Isuzu Motors joint ventures (DMAX Ltd. and GMIDEL).

GM Powertrain is a global producer of engines, transmissions, castings and components for GM vehicles and other automotive, marine, and industrial OEMs. Headquartered in Pontiac, GM Powertrain has operating and coordinating responsibility for General Motors powertrain manufacturing plants and engineering centers in North America, South America, Europe, and the Asia-Pacific region.

General Motors Corp. (NYSE: GM), the world's largest vehicle manufacturer, employs 342,000 people globally in its core automotive business and subsidiaries. Founded in 1908, GM has been the global automotive sales leader since 1931. GM today has manufacturing operations in 32 countries and its vehicles are sold in more than 190 countries. In 2002, GM sold more than 8.6 million cars and trucks, nearly 15 percent of the global vehicle market. GM's global headquarters is at the GM Renaissance Center in Detroit. More information on GM and its products can be found on the company's consumer website at www.gm.com.
 

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So, how does this now compare to the PowerStroke and the Cummin's H.O. version? I haven't checked the specs lately.
 

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GM is making one of the best diesels in the business. Why not expand on that success and add smaller, cheaper diesels on more models of cars and trucks? GM could really sell the fuel economy of these engines.
 

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Originally posted by Highlander@Dec 8 2003, 10:59 AM
So, how does this now compare to the PowerStroke and the Cummin's H.O. version?  I haven't checked the specs lately.
Ford 6.0 Powerstroke:
HP: 325 @ 3300
TQ: 560 @ 2000

Dodge Cummins 5.9 H.O.: (Improved 2004.5 model)
HP: 325 @ ?
TQ: 600 @ ?

(2004 Cummins H.O. is 305/555)
 

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Where did u get this information? Is at accurate? I'm just wondering cause there's nothing about it on chevy's 2004 web page.

Also is it true that dodge is upgrading it's diesel?
 

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Originally posted by silverado_13@Dec 8 2003, 07:11 PM
Where did u get this information?  Is at accurate?  I'm just wondering cause there's nothing about it on chevy's 2004 web page.

Also is it true that dodge is upgrading it's diesel?
Here's an article on the beefier Cummins for 2004.5:
http://home.businesswire.com/portal/site/g...716&newsLang=en

And here's one on the Duramax which also mentions the new Cummins:
http://www.autonews.com/news.cms?newsId=7201

Hope that helps! :kama:
 

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jckjd Posted: Dec 8 2003, 06:02 PM:

GM is making one of the best diesels in the business. Why not expand on that success and add smaller, cheaper diesels on more models of cars and trucks? GM could really sell the fuel economy of these engines

Amen, I agree. I would love to be able to pull a boat and still get 25 mpg. Not to mention diesels tend to last longer. Isn't Ford introducing a 4.0 liter v6 diesel in their new f150?
I just don't understand why the colorado, silverado, and tahoe don't get a diesel option. They are big and heavy, but could benifit from the better fuel economy of a deisel and overall reliablity. I am not saying that they need the huge duramax, but something that adds the power and relability that comes with the duramax engine technology. The isuzu version of the colorado is even getting a deisel.
However, if GM does makes deisels for their smaller trucks, I expect much better engines than the deisels that they used in the 80's. Those were scary.
 

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Originally posted by member12@Dec 11 2003, 05:46 PM
jckjd Posted: Dec 8 2003, 06:02 PM:

GM is making one of the best diesels in the business. Why not expand on that success and add smaller, cheaper diesels on more models of cars and trucks? GM could really sell the fuel economy of these engines

Amen, I agree. I would love to be able to pull a boat and still get 25 mpg. Not to mention diesels tend to last longer. Isn't Ford introducing a 4.0 liter v6 diesel in their new f150?
I just don't understand why the colorado, silverado, and tahoe don't get a diesel option. They are big and heavy, but could benifit from the better fuel economy of a deisel and overall reliablity. I am not saying that they need the huge duramax, but something that adds the power and relability that comes with the duramax engine technology. The isuzu version of the colorado is even getting a deisel.
However, if GM does makes deisels for their smaller trucks, I expect much better engines than the deisels that they used in the 80's. Those were scary.
I have allready seen a belt routing guide on a 2004 superduty for an 4.0l diesel.
 

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ford had hired international to design a 4.0 L diesel for the f150. project got pretty far along, then ford, unsatisfied with the reliability/performance of the power stroke diesels they were getting from international (they went through a bad batch, i believe) severed all ties beyond the powerstroke. international was left holding the bag on the development of the 4.0, and i believe legal action has been/will be taken on ford due to the late pullout. this was on blueovalnews a while back.
 

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Originally posted by jckjds@Dec 8 2003, 06:02 PM
GM is making one of the best diesels in the business. Why not expand on that success and add smaller, cheaper diesels on more models of cars and trucks? GM could really sell the fuel economy of these engines.
:D
Because................

The Duramax Diesel and the Allision Transmission come together, I am sure that you already know this. But it's not like trading the same shapes. The engine compartment would need to be re-designed to make room for not only for the radiator, but the engine cooler and the transmission. I bet you guys are all engineers in here, aren't you? ;)
 

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G.M. is making one of the best diesels on the market? Have you read anything on the 6 liter powerstroke? granted it may not have the highest torque of the big three, but its by far the most advanced diesel tech on the market, and not to burst anyones bubble, but when the duramax was revealed, it was all the rave with its 520 pounds of torque, but in reality, the 15 YEAR OLD 7.3 NAVISTAR INTERNATIONAL POWERSTROKE HAD 5 MORE FOOT POUNDS OF TORQUE. Isnt the idea of making a new and improved product to out-do the competiton generally, not be out-done by one thats been on the market for 15 years?
 

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Its a diesel....what do you expect it to sound like? if you wanted something less noisy you should have bought a cadillac or something, you dont sound like a truck kind of guy, the louder the better baby, coming from a guy that drives an f-350 on 44's with a 460 run through headers and dual straight exhaust baby
 

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The Dodge Cummins sounds like a true Diesel, noisy yes but sounds like it's better built. I've heard the new 6.0 liter from Ford and I think it's sounds better than even the Dodge in my opinion and once they work all the bugs it will be a true winner. Ford does need all the help they can get right now and the only thing they've got goin for them is their trucks and SUV's. Cars are starting to come around.
 

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From Ford Truck:

"G.M. is making one of the best diesels on the market? Have you read anything on the 6 liter powerstroke? granted it may not have the highest torque of the big three, but its by far the most advanced diesel tech on the market, and not to burst anyones bubble, but when the duramax was revealed, it was all the rave with its 520 pounds of torque, but in reality, the 15 YEAR OLD 7.3 NAVISTAR INTERNATIONAL POWERSTROKE HAD 5 MORE FOOT POUNDS OF TORQUE. Isnt the idea of making a new and improved product to out-do the competiton generally, not be out-done by one thats been on the market for 15 years? "

The 7.3L Powerstroke had 500 foot pounds of torque in 2001 when the Duramax came out, and only 235 hp. Since then, they bumped up the torque to 520 by 2003.

When did it ever have 525 foot pounds of torque from the factory as you state?

Even if it was rated at 5 more in torque, doesn't the Duramax's 65 hp advantage count as new and improved?
 
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