6.7L Cummins Turbodiesel

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5.9L Cummins 12v Specs

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6.7L Cummins Emissions






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6.7L Cummins Specs




The 6.7L Cummins is the latest of the B-series engines, introduced mid model year in 2007. With an introductory rating of 350 HP & 650 lb-ft, it is also the most powerful B-series ever offered. The 5.9L ISB was replaced by the 6.7L to meet strict new diesel emission requirements. To meet such requirements, the 6.7L is equipped with an EGR (exhaust gas recirculation) system, a variable geometry turbocharger (VGT), and a diesel particulate fitler designed to reduce diesel particulate matter by more than 90 percent. A new, higher-pressure version of the Bosch direct injection system is used. For the 2013 model year, the Cummins was made available in three variations, the most powerful of which was rated at 385 hp and 850 lb-ft of torque. Fuel delivery and turbocharger boost refinements resulted in another increase for the 2015 model year, giving the engine an extra 15 lb-ft of torque.


6.7L Cummins Specs


408 cubic inches, 6.7 liters


Inline 6 cylinder

Firing Order:


Compression Ratio:



4.21 inches


4.88 inches


Direct injection, electronically controlled Bosch high pressure common rail, 26,000 psi max.


Holset variable geometry turbocharger.


OHV, 4 valves per cylinder, solid lifter camshaft

Oil Capacity:

12 quarts


1050-1150 lbs dry


350 - 385 hp, see chart below.


610 - 865 lb-ft, see chart below.

Years Produced:

2007.5 to present.



6.7L Cummins Horsepower/Torque by Model Year

Model Year

Rated Horsepower

Rated Torque

2007 - 2010

350 hp @ 3,013 rpm

• 650 lb-ft @ 1,500 rpm (auto trans)
• 610 lb-ft @ 1,500 rpm (manual trans)

*2011 - 2012

350 hp @ 3,013 rpm

• 800 lb-ft @ 1,600 rpm (auto trans)
• 610 lb-ft @ 1,500 rpm (manual trans)

2013 - 2014

• 350 hp @ 2,800 rpm
• 370 hp @ 2,800 rpm
• 385 hp @ 2,800 rpm

• 660 lb-ft @ 1,500 rpm (manual trans)
• 800 lb-ft @ 1,700 rpm (68RFE trans)
• 850 lb-ft @ 1,700 rpm (Aisin AS69RC trans)


• 350 hp @ 2,800 rpm
• 370 hp @ 2,800 rpm
• 385 hp @ 2,800 rpm

• 660 lb-ft @ 1,500 rpm (manual trans)
• 800 lb-ft @ 1,700 rpm (68RFE trans)
• 865 lb-ft @ 1,700 rpm (Aisin AS69RC trans)

* Feb 2011, some early model year 2011 trucks may have 2010 power ratings.


High Output 6.7L Cummins

Early in 2011, Cummins announced an upgraded version of the 6.7L Cummins would be released for the spring. The updated engine saw torque increase to 800 lb-ft (from 650 lb-ft). Horsepower ratings did not change, nor did output for the derated, manual transmission version of the engine.

For 2013, the 6.7L Cummins underwent further changes and was scheduled to be offered in 3 version:
• 350 hp, 660 lb-ft version coupled to the G56 manual trans.
• 370 hp, 800 lb-ft version coupled to the 68RFE automatic trans.
• H.O. 385 hp, 850 lb-ft version coupled to the Aisin AS69RC trans (High Output).
In addition to the new offerings, SCR (selective catalytic reduction) w/ DEF injection became standard on the new high output version. Ram Trucks reported an approximate 10% increase in fuel economy with the new engine lineup. To reach and safely maintain these power levels, Ram trucks received dual transmission coolers, dual radiators, a higher efficiency intercooler (charge-air-cooler), larger capacity EGR system, and a higher efficiency mechanical fan.


Additional 6.7L Cummins Info

• Manual transmission equipped 6.7L Rams have significantly less torque output than the automatic equipped 6.7L Rams.
• The 07-10 6.7L maintains peak torque between 1,500 & 2,800 RPM.
• Approximately 40% of the 5.9L Cummins' engine parts were carried over to the 6.7L Cummins.
• The 6.7 features an integrated exhaust brake direct from the factory, which improves safety and vehicle control while towing.
• Fuel injection system designed to lowers noise, vibration, and emissions while maximizing output.
• Met strict NOx emission requirements for 2010 3 years in advance.
• Standard emission equipment includes a diesel particulate filter & exhaust gas recirculation system. For 2013, DEF became standard on the H.O. version.
• Initially designed to safely run on B5 biodiesel. Later revised to run on B20 for 2011+ model years.


6.7L Cummins Torque Curve

Standard 6.7L Cummins (2007 - early 2011 models)

800 lb-ft 6.7L Cummins (2011-2012)





Cummins Inc.

Ram Trucks (Chrysler)