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Pumping out over 800 lb-ft of torque, the latest version of the Cummins turbodiesel has come a long way. The 5.9L 12v was the first diesel to be put into a Dodge truck, and the relationship between Dodge/Chrysler and Cummins has been strong since. Both the 5.9L and 6.7L are inline 6 cylinder engines, the only 6 cylinder turbodiesel that has ever been offered in the light duty truck market (Ford & GM diesels have always been V-8 configuration). The 12v helped earn Cummins a reputation of strength and reliability, though the more recent 6.7L has suffered many longevity/reliability concerns relating to the engine's emissions systems. Obviously, the simplicity of a mechanically injected, non-emissions controlled turbodiesel still has its perks.
1989 5.9L 12v Cummins |
2011 6.7L Cummins ISB |
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| Engine: | 5.9L 12v Cummins Turbodiesel | 6.7L ISB Cummins Turbodiesel |
| Years of Operation: | 1989 - 1998 | 2007.5 - Current |
| Displacement: | 5.9L, 359 cubic inches | 6.7L, 409 cubic inches |
| Aspiration: | Turbocharged | Turbocharged & intercooled, VGT |
| Injection: | Direct injection, mechanical injection pump | Direct injection, high pressure Bosch common rail |
| Block/Head Material: | cast iron/cast iron | cast iron/cast iron |
| Horsepower: | 160 hp @ 2,500 rpm (1989) | 350 hp @ 3,000 rpm (2011) |
| Torque: | 400 lb-ft @ 1,600 rpm (1989) | 800 lb-ft @ 1,600 rpm (2011) |
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