What Are the Specs of a Dodge Ram Cummins Turbo Diesel Engine?


Quick Answer

The ISB6.7 Cummins engine used in Dodge and Ram trucks, as of 2016, is a 6.7-liter inline-6 turbocharged engine that outputs up to 385 horsepower and up to 900 foot-pounds of peak torque. This engine has a 17.3:1 compression ratio and a governed maximum speed of 3000 rpm.

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Full Answer

The ISB6.7 engine used in Dodge and Ram pickup trucks is fitted with a Holset variable-geometry turbocharger and uses high-pressure common-rail fuel injection to improve the smoothness of power delivery and fuel economy. An air intake throttle was added to 2013 and later models to increase fuel efficiency even further. The ISB6.7 has 4.21-inch cylinder bores, a 4.88-inch stroke length and weighs approximately 1150 pounds without fluids.

The actual power output of a Cummins turbodiesel engine depends on the type of transmission installed in the Dodge or Ram pickup truck with the engine. The maximum possible 900 foot-pounds of torque output is only available on trucks fitted with an Aisin heavy-duty automatic transmission capable of coping with the power output. Engine output in trucks with manual transmissions is limited to only 660 foot-pounds of torque, and trucks with the Dodge 68RFE automatic transmission are limited to 800 foot-pounds of torque to avoid damaging the transmission.

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