Dodge's new diesel debuts at Texas State Fair
The Texas State Fair was the location of another big truck announcement last week when Dodge announced its new Cummins turbo-diesel engine for the 2007 Dodge Ram 2500 and 3500. Enlarged to 6.7 liters from 5.9 through increases in both bore and stroke, the new inline-six turbodiesel now boasts 350 horsepower and 650 ft-lbs. of torque, all while meeting stricter diesel emissions standards for 2007. The engine also features an optional exhaust brake function that improves braking under heavy towing situations, a common feature of big rigs and large motor coaches.
The new power ratings makes the 6.7-liter Cummins turbodiesel competitive with new powerplants from both Ford and General Motors, each of which has also announced new or substantially upgraded diesel motors for 2007 and beyond.
Follow the jump to see how each automaker's new diesel compares with the others.
[Source: Dodge]
2007 Dodge Ram 2500/3500
6.7-liter inline-six turbo diesel
350 horsepower at 3,000 rpm
650 ft-lbs. of torque at 1,500 rpm
Six-speed automatic
2008 Ford F-Series Super Duty (F-250, F-350, F-450)
6.4-liter V8 twin-turbo diesel
350 horsepower at 3,000 rpm
650 ft-lbs. of torque at 2,000 rpm
Five-speed automatic or six-speed manual
2007 Chevrolet Silverado and GMC Sierra 2500HD/3500HD
6.6-liter V8 turbo diesel
365 horsepower
660 ft-lbs. of torque
Six-speed automatic
Reader Comments (Page 1 of 2)
ramsport47 3:54PM (10/02/2006)
Now...detune the 5.9 and put it in the 1500 and I'll be first on the list to buy one
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Shelby 8:11AM (10/02/2006)
I agree. Put a smaller straight 6 Cummins in a 1500 4x4, say 4.5L or so. Call it the Man's Edition . . . they'd sell like crazy. Have a sport package where you can get a stack. I'd buy it.
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MikeW 9:30AM (10/02/2006)
How much does this engine weigh?
Why did DCX decide to couple this diesel with two different automatics? PTO ability?
68RFE-3.231, 1.837, 1.41, 1, 0.816, 0.625, R 4.444
Chassi cabs AS68RC-3.74, 1.96, 1.34, 1, 0.77, 0.63, R 3.54.
The G56 manual has nice ratio coverage 8:1 & nice gearing when you are not towing (not launching in 1st)
5.94, 3.28, 1.98, 1.3, 1, 0.74 R5.42 and is available with the 5.7 V8 instead of chrysler's 545RFE 4.5:1 ratio spread.
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AndyF 10:19AM (10/02/2006)
Bit curious, why such large capacity required?
Is it a problem of scaling up? I see the new 2.0 turbodiesel in Euro cars are putting out around 170hp and 230lb-ft torque, can this not scale up in size so a 4.5 or 5.0 will do instead?
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MattS 10:57AM (10/02/2006)
The way things are going in the HD Diesel market I half expected Dodge to wedge a 565HP ISX in there and call it a freaking day.
m
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AM 11:49AM (10/02/2006)
Put a diesel in a 1/2 ton and I'll get excited enough to buy one.
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amp 12:50PM (10/02/2006)
"The engine also features an optional exhaust brake function that improves braking under heavy towing situations, a common feature of big rigs and large motor coaches."
Does this mean we'll have to put up with 'jake braking' Rams in non-highway situation? I sure hope not.
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lwstudent 12:44AM (10/04/2006)
in addition to a smaller cummins in a 1500 truck, make it B100 compatible. go to have some biodiesel options when the next oil shock occurs.
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MikeW 1:38PM (10/02/2006)
No. the 'jake brake' breaks the engine's operating cycle. The negative work done by compression is returned on the power stroke. The 'jake brake' (there are different kinds) breaks that, so the energy stored via compression is not returned to the crankshaft. Cue the noise...
All this does is constrict the exhaust and provide retarding force by having a pressure imbalance across the piston on the exhaust stroke.
Same thing as the throttle on gasoline engines, providing a restiction so the difference in pressure across the piston on the intake stroke does negative work.
The aftermarket has had numerous retrofitable exhaust throttles.
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Vctor Rubiera 1:49PM (10/02/2006)
Are you really shure that the horsepower in the GM engine is correct?, because there is the information that with the emissions for 2007 the torque and horsepower fall to 650hp and 350ft-lbs. I can´t see how the GM engine can make this numbers. please can you check if GM is telling the truth? or is just another publucity about been the most powerful as always.
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Vctor Rubiera 3:27PM (10/02/2006)
In the comment #9 I make a mistake, it should be 350hp and 650ft-lbs. please take note.
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chewy 3:37PM (10/02/2006)
I know this is a different type of diesel, but the Audi V12 TDI makes more power and torque with better fuel efficiency and definately less weight.
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amp 4:35PM (10/02/2006)
I'm familiar with how 'jake braking' works. When I hear the term 'engine braking' that's what I think of. I would think the hardware needed to accomplish that would be too costly for this engine.
I'm a little clueless when it comes to exhaust braking though, how is that implemented? Is there some sort of electronically actuated valve that restricts the exhaust flow during braking. If so, where's the valve, pre-cat, post cat? I don't think that a standard exhaust pipe could handle that kind of back pressure.
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amp 4:44PM (10/02/2006)
I did some digding and found the press release. Here's the bit on exhaust braking, straight from the horse's, er, ram's mouth. It looks like it's implemented through their VGT, variable geometry turbo.
First-ever Optional Exhaust Brake
For the first time in a Dodge Ram Heavy Duty truck, an integrated exhaust brake is available direct from the factory. Utilizing the 6.7-liter Cummins turbo-diesel engine’s new turbocharger, the exhaust brake significantly improves control when towing heavy applications, such as pulling RV fifth wheels and horse trailers, providing added control and brake savings by transforming horsepower into braking power.
“Towing and hauling capability is critical for our customers, as more than 90 percent of Dodge Ram Heavy Duty customers tow with their truck,” said Kunselman.
Benefits of the exhaust brake include:
Increased vehicle control to provide the owner additional peace of mind when towing
Enhanced safety by reducing overheating and fading of brakes on downhill grades
Lower cost of ownership, extending brake life by as much as three times
Capability for faster cold-weather cab warming
The 2007 Dodge Ram Heavy Duty’s 6.7-liter Cummins turbo-diesel engine’s VGT is capable of creating the maximum exhaust restriction through a wide range of operating speeds, improving braking performance at low and high engine speeds. Testing has shown more than a
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amp 4:45PM (10/02/2006)
Okay, I guess there's a limit to Autoblog's comment length. Here's the link to the PR. It's about a third of the way down.
http://cgcomm.daimlerchrysler.com/documents.do?method=display&docType=pressrelease&docId=6229
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UK-KID 4:52PM (10/02/2006)
Audi 4.2 TDI // 335bhp // 479lbs-ft (Bhp/L)=79.7 // (lb-ft/L)=114
VW 5.0L TDI // 313bhp // 553lbs-ft (Bhp/L)=62.6 // (lb-ft/L)=110.6
BMW 4.0 TTD // 300bhp // 516lbs/ft (Bhp/L)=75 // (lb-ft/L)=129
MB 4.2 CDI // 306bhp // 516lbs-fs (Bhp/L)=72.8 // (lb-ft/L)=122.8
Dodge 6.7 TD // 350bhp // 650lbs-ft (Bhp/L)=52.2 // (lb-ft/L)=97
(MB actuall Displacement is approx 4.0L)
And People Wonder Why These manufacturers Are Continuously Loosing Their Market Share In The Competitive World Of Automotive Engineering
(Nm to Lb-Ft Conversion // 1Nm * 0.7376)
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Bill S. 6:26PM (10/02/2006)
Dodge 650ft lbs @ 1500 RPM
VW 553ft lbs @ 2000 RPM
BMW 4.4L, not 4.0L, 553lb ft @1750 RPM
Audi 480ft lbs @1600-3500 RPM
MB 538ft lbs @2200 RPM
What do you notice about the Dodge torque figure?
I only wish I could overlay the torque curves from a dynometer. That way you'd have a nice picture, too.
And People Wonder Why People From the UK Capitalize Every Word And Open Their Mouths When They Don't Know Shit About Trucks.
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gary 2:15PM (10/15/2006)
Cumming's other new diesel engines...
http://www.greencarcongress.com/2006/07/cummins_to_prod.html
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Justin 9:13PM (10/02/2006)
The newest HD deisel truck I've ridden in is a 99 F-350 (which sounds sweet imo), so does anyone know if these new deisels are gonna have to be quieted down for the mainstream, or if they'll still sound like a real deisel truck?
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Carlton 9:00PM (10/02/2006)
Great. Another engine for the Texas Bubba Buggys.
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