6.0L Power Stroke vs. 5.9L Cummins vs. 6.6L Duramax

Power Stroke

6.0L Power Stroke

Cummins

5.9L Cummins ISB

Duramax

6.6L Duramax LBZ

Production Years:

2003 - 2007

1998 - 2007.5

2006 - 2007.5

Manufacturer:

International

Cummins

Isuzu

Block/Head Material:

Iron/Iron

Iron/Iron

Iron/Aluminum

Configuration:

V-8

Inline 6

V-8

Displacement:

6.0 liters, 365 cubic inches

5.9 liters, 359 cubic inches

6.6 liters, 403 cubic inches

Compression Ratio:

18.0:1

16.3:1 (17.3:1 in HO version)

16.8:1

Bore x Stroke:

3.74 x 4.13 inches

4.02 x 4.72 inches

4.06 x 3.90 inches

Injection System:

Hydraulic electronic unit injection (HEUI)

Bosch rotary injection pump. Switched to high pressure common rail injection in 2003

High pressure common rail, CP3 injection pump

Aspiration:

Variable Geometry Turbocharger (VGT)

Holset Turbocharger

Variable Geometry Turbocharger (VGT)

Valvetrain:

overhead cam, 4 valves per cylinder

over head valve, 4 valves per cylinder

over head valve, 4 valves per cylinder

Weight:

approx. 966 lbs

1,150 lbs (approx.)

835 lbs (approx.)

Peak Horsepower:*

325 hp @ 3,300 RPM

325 hp @ 2,900 RPM (high output model)

360 hp @ 3,200 RPM

Peak Torque:*

570 lb-ft @ 2,000 RPM

610 lb-ft @ 1,600 RPM (high output model)

650 lb-ft @ 1,600 RPM

Reputation:

Stock torque to yield (TTY) head bolts proved to be a weak link. The overall engine design is good, though the emissions equipment proved to cause issues in some applications. Ford Power Stroke continues to outsell Cummins & Duramax. Overall a strong performer with good fuel economy. The Ford Torqshift 5-speed automatic has a good reputation for strength, crisp shifts, & appropriate shift timing.

Brute strength, builds torque at low RPM. Lots of aftermarket engine modifications available. More turbo lag than Ford & Chevrolet, and typically slower in stock form. Medium duty engine in light duty trim. The stock Dodge transmissions are significantly weaker than Ford or General Motors transmissions. They have a reputation of failure when engines are tuned to produce anything over the stock power rating.

Like the other 3 Duramax engines, a large portion of the diesel community ridicule the Duramax for its aluminum heads & small connecting rods. However, the LBZ is considered the "hot rod" of Duramax diesels due to its power potential when complimented with aftermarket tuning. The Allison 1000 6-speed automatic transmission remains a strong part of the Duramax package.

Applications:

2003 - 2007 Ford Super Duty; F250, F350, F450, F550, F650.

1998 - 2007.5 Dodge Ram 2500 & 3500 trucks.

2001 - 2004 Chevrolet & GMC HD 2500 & 3500 trucks.

 

*Peak horsepower & torque refers to the highest advertised power output during the engine's production.

 

 

 

You may also be interested in the following articles:

6.7L Cummins vs. 6.7L Power Stroke

6.4L Power Stroke vs. Cummins

7.3L Power Stroke vs. 5.9L Cummins