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

 

 

 

7.3L Power Stroke

5.9L Cummins ISB

6.6L Duramax LB7

Production Years:

1994.5 - 2003

1998 - 2007.5

2001 - 2004

Manufacturer:

International

Cummins

DMAX (Isuzu, GM joint venture)

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