The 7.2 liter Cummins B7.2 is a new B-Series engine under development for medium duty vehicle applications with availability scheduled for the 2027 model year. The B7.2 will replace the long-running 6.7 liter Cummins employed in similar applications, including Ram pickup and chassis cab models. It shares the same 4.21 inch cylinder bore as the 6.7 liter, but features a longer 5.24 inch stroke length (compared to 4.88 inches) resulting in the larger displacement.
Although comprehensive and finalized details have not yet been revealed the 7.2 liter engine is not, by design, an evolution of the 6.7 ISB. For example, the 7.2 Cummins utilizes a dual overhead camshaft design whereas the 6.7 is an overhead valve engine. This feature alone substantially changes the structure of the engine block and cylinder head.
Source - Cummins Inc
Enhanced Aftertreatment System
It is no coincidence that the B7.2 is scheduled for 2027 as this target is aligned with more stringent EPA and CARB emissions regulations set to go into affect for 2027 model year vehicles. The updated rules are fairly comprehensive in that they require reductions in several categories of pollutants, including greenhouse gases, nitrogen oxides, particulate matter, hydrocarbons, and carbon monoxide.
It is highly likely that these requirements serve as the primary driving force behind the development of this new engine. The 7.2 Cummins will feature an even more sophisticated exhaust aftertreatment system to meet the upcoming emissions mandate. In addition to automatic engine shutdown and start-stop features, expect to see electrically heated catalysts and enhanced sensory guidance in the SCR and particulate filter systems. It is currently unknown what additional equipment and cold-start aids Cummins will utilize on the engine platform.
Power Ratings
Like other commercial engines of its kind, the 7.2 liter will be offered in a variety of horsepower and torque ratings tailored to industry specific requirements. The official word from Cummins is that peak output will range between 240 and 340 horsepower and 650 to 1,000 lb-ft of torque. The table below summarizes the range of horsepower and torque combinations advertised by Cummins at the time of publishing.
| Rated Horsepower | Rated Torque (lb-ft) @ RPM |
|---|---|
| 240 | 650 @ 1,200 |
| 260 | 700 @ 1,200 |
| 280 | 750 @ 1,200 |
| 280 | 700 @ 1,200 |
| 300 | 850 @ 1,200 |
| 300 | 1,000 @ 1,200 |
| 320 | 900 @ 1,200 |
| 320 | 1,000 @ 1,200 |
| 340 | 900 @ 1,200 |
| 340 | 1,000 @ 1,200 |
The 6.7 Cummins is offered in configurations ranging between 200 and 325 horsepower and 570 to 750 lb-ft of torque. The historical range of power and torque in Ram pickup trucks is 350 to 430 horsepower and 610 to 1,075 lb-ft while engine output in chassis cab trucks has ranged from 305 to 360 horsepower and 610 to 800 lb-ft. Expect the 7.2 liter Cummins in Ram trucks to have significantly higher figures than the commercial options. Peak output should be at least a small improvement over the current 6.7 Cummins values.
Engine Specifications
| Production Years | Scheduled for 2027 introduction | |
| Assembly Plant | Cummins Rocky Mountain Engine Plant, Whitakers, North Carolina | |
| Applications | Medium duty trucks, vocational, Ram pickup & chassis cab trucks | |
| Type | Direct injection 4 stroke turbodiesel | |
| Configuration | Inline 6 cylinder | |
| Displacement (advertised) | 7.2 liters | |
| Calculated Displacement | 7.17 liters, 437.64 cubic inches | |
| Bore | 4.21 inches (107.0 mm) | |
| Stroke | 5.24 inches (133.0 mm) | |
| Bore/Stroke Ratio | 0.80 (undersquare) | |
| Firing Order | 1-5-3-6-2-4 | |
| Cylinder Numbers |  |
|
| Compression Ratio | TBA | |
| Engine Block Material | TBA | |
| Cylinder Head Material | TBA | |
| Valvetrain | Dual overhead camshafts (DOHC), 4 valves per cylinder, compression release engine brake ("Jake brake" [1]) | |
| Reciprocating Assembly | TBA | |
| Rotating Assembly | TBA | |
| Aspiration | Turbocharged, Holset turbocharger | |
| Starting Aids | TBA | |
| Injection Pump | TBA | |
| Engine Oil Capacity | TBA [2] | |
| Governed Engine Speed | 2,400 rpm [3] | |
| Horsepower | 240 - 340 horsepower [4] | |
| Torque | 650 - 1,000 lb-ft [4] | |
| Dry Engine Weight | 1,359 lbs | |
[1] - "Jake brake" refers to a specific line of compression release engine brakes developed and manufactured by Jacobs Vehicle Systems, which Cummins fully acquired in 2022. It is a type of engine retarder that releases cylinder pressure at the top of the compression stroke to minimize the rebound effect of the compressed air charge during the following stroke, increasing the braking effort of the engine.
[2] - A large engine oil capacity is anticipated to corroborate extended oil drain intervals advertised by Cummins
[3] - Commercial vehicle applications; marginally higher governed engine speed expected in Ram truck applications
[4] - Moderately higher horsepower and torque levels are anticipated in Ram truck applications; expected to exceed current 430 horsepower, 1,075 lb-ft