2007.5-2023 6.7L Cummins
Bigger displacement, more torque and modern emissions equipment.
Ram launched the 2018 Cummins 6.7-liter turbo diesel with 930 lb.-ft. of torque, followed by the 1,000 lb.-ft. version in 2019.
Engine Name: 6.7L ISB Cummins
Production Plant: Cummins Midrange Engine Plant (CMEP), Walesboro, Indiana
Configuration: Inline-six (I-6)
Bore: 4.21-inch
Stroke: 4.88-inch
Displacement: 408 ci (6.7L)
Compression Ratio: 17.3:1 (’07.5-‘18), 19.0:1 (’19-’23 standard output), 16.2:1 (’19-’23 high output)
Firing Order: 1-5-3-6-2-4
Block: Cast-iron (’07.5-‘18), compacted graphite iron (’19-‘23), deep-skirt, parent bore with block stiffener
Head: Cast-iron, 24-valve, crossflow style with six head bolts per cylinder and one-piece valve cover with rocker box
Crankshaft: Forged-steel (10-bolt crank flange on ’19-present)
Connecting Rods: Powdered-metal, fractured cap (’07.5-‘18), forged-steel (’19-‘23)
Pistons: Cast-aluminum (low-friction rings and larger diameter wrist pins added on high output engine)
Valvetrain: Overhead valve (OHV), 4 valves per cylinder, single cam-in-block design with solid lifters (hydraulic lifters from ’19-‘23), ductile-iron intake and exhaust rockers
Injection System: Electronic high-pressure common-rail, direct injection
Injection Pump: Bosch CP3 radial piston, three-plunger pump, 26,000 psi peak pressure (’07.5-’18, ’21-‘23), Bosch CP4.2 two-plunger pump (’19-‘20), 29,000 psi peak pressure
Injectors: Bosch electronic, solenoid-activated
Aspiration: Turbocharged and intercooled
Intake: Cast-aluminum manifold
Turbo: Holset HE351VE variable geometry with exhaust brake (’07.5-‘18), HE300VG variable geometry with exhaust brake (’19-present)
Peak Boost: 33 psi (’19-’23 high output)
Intercooler: Air to air
Emissions Equipment: Exhaust gas recirculation (’07.5-present), diesel oxidation catalyst (’07.5-present), diesel particulate filter (’07.5-present), NOx catalyst (’07.5-‘12), selective catalytic reduction (’13-present)
Horsepower: 350 hp at 3,013 rpm (’07.5-’12 automatic and manual transmission), 370 hp at 2,800 rpm (’13-’present 68RFE automatic), 385 hp at 2,800 rpm (’13-’18 Aisin AS69RC automatic, 3500 models only), 400 hp at 2,800 rpm (’19-’20 high output with Aisin AS69RC automatic, 3500 models only), 420 hp at 2,800 rpm (’21-present high output with Aisin AS69RC automatic, 3500 models only)
Torque: 650 lb-ft at 1,500 rpm (’07.5-’10 68RFE automatic), 610 lb-ft at 1,500 rpm (’07.5-’12 G56 manual), 800 lb-ft at 1,600 rpm (’11-’18 68RFE automatic), 660 lb-ft at 1,500 rpm (’13-’18 G56 manual), 850 lb-ft at 1,700 rpm (’13-’14 Aisin AS69RC automatic, 3500 models only), 865 lb-ft at 1,700 rpm (’15 Aisin AS69RC automatic, 3500 models only), 900 lb-ft at 1,700 rpm (’16-’17 Aisin AS69RC automatic, 3500 models only), 930 lb-ft at 1,700 rpm (’18 Aisin AS69RC automatic, 3500 models only), *1,000 lb-ft at 1,800 rpm (’19-’20 Aisin AS69RC automatic, 3500 models only), 1,075 lb-ft at 1,800 rpm (’21-present Aisin AS69RC automatic, 3500 models only)
Governed Speed: 3,000 rpm
Available Transmissions: G56 six-speed manual (’07.5-’18), 68RFE six-speed automatic (’07.5-present), Aisin AS69RC six-speed automatic (’13-present)
* = First to 1,000 lb-ft
