5.9L 24-valve Cummins ISB
In 1998, the BT 5.9 was redesigned as a 24 valve engine to updated emission requirements. ISB stands for Interact System B. The ISB featured a Bosch VP44 rotary injection pump until 2003, when the injection system was upgraded to a Bosch high pressure common rail fuel injection system, which increased power output. In 2001, a high output (HO) version of the ISB became available, which slightly increased the ouput of manual transmission equipped trucks. A 610 version of the ISB became available which pushed torque to 610 lb-ft. Well known for its low speed torque, the Cummins 5.9 ISB has an advantage over V8 diesel engines in the light duty truck market.
5.9L Cummins ISB Specifications:
Displacement: |
359 cubic inches, 5.9 liters |
Configuration: |
Inline 6 cylinder |
| Firing Order: | 1-5-3-6-2-4 |
Compression Ratio: |
16.3:1, 17.2:1 (high output version) |
Bore: |
4.02 inches |
Stroke: |
4.72 inches |
Injection: |
- Direct Injection |
Aspiration: |
Holset turbocharger |
Valvetrain: |
OHV, 4 valves per cylinder, solid lifter camshaft |
Oil Capacity: |
10 quarts |
Weight: |
approx. 1,150 lbs |
*Horsepower: |
235 - 325 HP @ 2,900 RPM |
*Torque: |
460 - 610 lb-ft @ 1,600 RPM |
| Governed Speed: | 3,200 RPM |
| Years of Operation: | 1998.5 - 2007 |
5.9L Cummins ISB Info:
- ISB is the acronym for Interact System B.
- The 5.9L ISB made Ward's 10 Best Engines list in 2004.
- Power output on automatic equipped Cummins powered Rams was slightly downrated from the manual transmission powered Rams from 1998 - 2001.
5.9L Cummins ISB Specs