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Old 03-08-2016, 02:59 PM   #1
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Default Duramax 4cyl to go into Express/Sananna

Looks like starting next year the 6.6 Duramax 6 spd will be replaced by the new 2.8 4cyl w/8spd in the vans. I wonder if this will also apply to the chassis cab/cutaway versions? The 4cyl surely doesn't have enough power for the 35/4500 chassis that so many public safety units are using now....Hummm...

General Motors Fits 2.8L Duramax to Chevrolet Express and GMC Savana
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Old 03-08-2016, 03:11 PM   #2
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The 4cyl surely doesn't have enough power for the 35/4500 chassis that so many public safety units are using now....Hummm...
Don't be so sure. The Sprinter 4cyl/7-speed drivetrain is a dream.
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Old 03-08-2016, 03:24 PM   #3
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Good point...
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Old 03-08-2016, 09:47 PM   #4
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in the Colorado, the engine produces 181 hp and 369 lb-ft, down significantly from the 6.6’s 260 hp and 525 lb-ft.
That's not too shabby to be honest. With eight gears in the automatic this will feel like a lot more due to the gear ratios.
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Old 03-08-2016, 10:38 PM   #5
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That's not too shabby to be honest. With eight gears in the automatic this will feel like a lot more due to the gear ratios.
That will be plenty of power. The Sprinter 4Cyl is only 2.1L only has 265 lb-ft of torque and a 7-speed transmission. This is power statement on the MB web site:

4-Cylinder BlueTEC Turbocharged Diesel Engine

Effortlessly combining the benefits of two-stage turbocharged power, 265 lb-ft of torque, diesel fuel economy and durability in one compact package, the impressive 4-cylinder powertrain with 7-speed 7G-TRONIC transmission offers you up to 18%2 greater fuel efficiency, standard on all Sprinter Van models.
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Old 03-08-2016, 10:41 PM   #6
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So rather than bring in their Euro van line GM is going to repower the existing vans with small diesel to compete better with the Sprinter, Promaster and Transit vans
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Old 03-08-2016, 10:50 PM   #7
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Without seeing the torque curves for the MB diesel and the Duramax, it is really not possible to tell how they will compare. It the torque curve of one or the other is higher in rpm it will get you up a mountain a lot faster. If running at max torque and 1800rpm vs the same torque at 3600rpm, the 3600 will get you up the same hill nearly twice as fast (there is a wind resistance correction needed do to the added speed). A single point on a torque curve makes it tough to know.

As they say, torque tells you if it will move, horsepower says how fast the torque will move it, and rpm gives the horsepower to torque.
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Old 03-09-2016, 12:42 AM   #8
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Here's the 2016 specs in the Colorado/Canyon w/6spd
2.8L Duramax Specs | Colorado & Canyon Diesels
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Old 03-09-2016, 02:26 PM   #9
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It's just an MPG play, and a good one at that. Not for towing. In the Colorado/Canyon, the tow rating only increased 600 lbs over the V6 gas engine.

The old engine must have been de-tuned for the van application. This same engine in my Silverado is 425 horsepower and 795 ft lbs of torque - it's a beast!
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Old 03-09-2016, 03:05 PM   #10
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It's just an MPG play, and a good one at that. Not for towing. In the Colorado/Canyon, the tow rating only increased 600 lbs over the V6 gas engine.

The old engine must have been de-tuned for the van application. This same engine in my Silverado is 425 horsepower and 795 ft lbs of torque - it's a beast!
Your assumption is correct. Detuned, less power with the 6.6 in the van application. Partly because the van chassis doesn't have the Allison 1000 in it like the pickups do, (won't fit). It's got a HD Turbo Hydramatic 6L90, I believe is the model number. The vans don't need all that power anyway like the pickups
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