Cummins is an engine maker that Dodge often uses in their Ram line of trucks. In 2007, Cummins introduced their 6.7-liter high-output turbo diesel I-6 engine. Named the 6.7 L Cummins, the engine was the most powerful B-Series offered in 2007. This new engine replaced the 5.9-liter ISB to meet new diesel emission requirements.
Power
The 6.7 L Cummins offers a maximum 350 horsepower at 3013 rpm. The automatic-transmission version offers maximum torque of 650 pound-feet at 1500 rpm, while the manual-transmission version offers maximum torque of 610 pound-feet at 1500 rpm. The compression ratio is high at 17.3:1.
Measurements
The 6.7 L Cummins displaces 409 cubic inches. Bore and stroke are 4.21 inches and 4.88 inches. Oil capacity is 12 quarts and it weighs about 1050 pounds. Nitrogen oxide emission requirements went into effect in 2010, and the 6.7 L Cummins met these requirements three years in advance.
Miscellaneous
This engine boasts an inline six-cylinder configuration, is liquid-cooled and is intercooled with a firing order of 1-5-3-6-2-4. It has a direct-injection system using an electronically controlled Bosch high-pressure common rail with 26,000 psi maximum. A variable-geometry turbocharger is also part of the engine. There is an OHV valve train with four valves per cylinder and a solid lifter camshaft.
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