7.3L Power Stroke vs. 5.9L Cummins vs. 6.6L Duramax

 

7.3L Power Stroke Turbodiesel

7.3L Power Stroke

5.9L Cummins 24v

5.9L Cummins ISB

6.6L Duramax turbodiesel

6.6L Duramax LB7

Production Years:

1994.5 - 2003

1998 - 2007.5

2001 - 2004

Manufacturer:

International

Cummins

Isuzu

Block/Head Material:

Iron/Iron

Iron/Iron

Iron/Aluminum

Configuration:

V-8

Inline 6

V-8

Displacement:

7.3 liters, 444 cubic inches

5.9 liters, 359 cubic inches

6.6 liters, 403 cubic inches

Compression Ratio:

17.5:1

16.3:1 (17.3:1 in HO version)

17.5:1

Bore x Stroke:

4.11 x 4.18 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:

Turbocharged

Holset Turbocharger

Turbocharged

Valvetrain:

over head valve, 2 valves per cylinder

over head valve, 4 valves per cylinder

over head valve, 4 valves per cylinder

Weight:

920 lbs (approx.)

1,150 lbs (approx.)

835 lbs (approx.)

Peak Horsepower:*

275 hp @ 2,800 RPM

235 hp @ 2,700 RPM (2003 model year**)
325 hp @ 2,900 RPM (high output model)

300 hp @ 3,100 RPM

Peak Torque:*

525 lb-ft @ 1,600 RPM

460 lb-ft. @ 1,400 RPM (2003 model year**)
610 lb-ft @ 1,600 RPM (high output model)

520 lb-ft @ 1,800 RPM

Reputation:

Reliable, powerful, & durable. More 7.3L Power Strokes are on the road today than GM and Dodge diesel trucks combined. Considered one of the best light/medium duty diesel engines ever produced.

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.

Ridiculed for having aluminum heads on a diesel & smaller connecting rods than the Power Stroke & Cummins. Quick turbo spooling and good fuel economy are its well known traits.

Applications:

1994.5 - 2003 Ford F250, F350, F450, F550, F650 trucks.

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 unless otherwise noted.

**Cummins horsepower & torque output includes peak advertised as well as the 2003 model year so that a fair comparison can be made to the Duramax LB7 & the 7.3L Power Stroke, both of which ended production several years before the 5.9L Cummins.

 

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6.6L Duramax vs. 6.7L Power Stroke

6.4L Power Stroke vs. 6.7L Cummins

1/2 Ton Diesel