Specifications on Cummins 5.9/6.7L Engines

Written by harry havemeyer
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Diesel engines rely on pressure to cause fuel combustion, as opposed to standard gasoline engines that rely on spark plugs. Diesel-powered motors are also noteworthy in that they actually use fuel as a lubricant as well. Cummins is one of the premier brands in diesel engine manufacturing and their engines power many heavy-duty trucks.

5.9 L 12v Specs

The 5.9 L 12-valve Cummins engine is built around an in-line-six cylinder engine block with a 1-5-3-6-2-4 firing order. This engine has a bore of 4.02 inches and a stroke of 4.71 inches. with a compression ratio of 17-to-1 and an overhead valve configuration. The 5.9 L 12-valve Cummins engine has a maximum output ranging from 160 to 215 horsepower at 2,500rpm and from 400 to 440 pound-feet of torque at 1,600rpm. Oil capacity for this motor is 11 quarts.

5.9 L 24v Specs

The 24-valve versions of Cummins' 5.9 L in-line-six cylinder diesel has the same bore and stroke dimensions as the above, as well as firing order. This engine utilises four valves, two for intake and two for exhaust, configured in an overhead set-up. The standard compression ratio of the 5.9 L 24v engine is 16.3-to-1, but high output versions have a 17.2-to-1 compression ratio. Output for the 24-valve version of the Cummins 5.9 L diesel ranges from 235 to 325 horsepower at 2,900rpm and from 460 to 610 pound-feet of torque at 1,600rpm. This motor uses 10 quarts of oil.

6.7 L Specs

The 6.7 L Cummins diesel engine is based around an in-line-six cylinder engine block with a 1-5-3-6-2-4 firing order. This engine has a bore of 4.21 inches and a stroke of 4.88 inches, with a 17.3-to-1 compression ratio. This engine has an overhead valve design with four valves per cylinder. The 6.7 L engine produces 350 horsepower at 3,000rpm. Peak torque is 650 pound-feet of torque when this engine is with an automatic transmission, while it produces 610 pound-feet of torque when with a manual transmission. This engine's oil reservoir has a 12-quart capacity.


The Cummins 5.9 and 6.7 L diesel engines are in Dodge trucks and compete against Chevrolet's Duramax and Ford's PowerStroke lines. The Cummins diesel engine is optional in Ram 1500, 2500 and 3500 full-size trucks. It is most frequently in the 2500 and 3500 heavy duty pickups, due to these trucks' owners wanting the hauling ability of a strong diesel.

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