Cummins L9 2021

L9 for Medium-Duty (2021)

Power 260 - 380 hp
194 - 283 kW
Torque 860 - 1250 lb-ft
1166 - 1695 N•m
Certification EPA 2021

Select an Application

Medium-Duty Truck School Bus Transit Bus



Heavy Duty capability in a medium-duty package

The next generation of L9 engines does more than just provide the power, reliability and durability you need to get the toughest jobs done. The 2021 L9 delivers class-leading power and torque ratings, an unmatched power-to-weight ratio, and the dependability and uptime you expect from Cummins. But we didn’t stop there. The 2021 L9 Productivity Series engines are up to 1.5% more fuel efficient than the 2017 models. The 2021 L9 Performance Series engines will see up to a 3.5% fuel economy improvement.

How’d we do it? We started by decreasing frictional losses in the base engine and optimizing combustion. We also incorporated a new piston design, optimized camshaft valve timing and reduced water pump speeds to minimize parasitic losses.

All About Uptime:

To improve Uptime we synchronized and extended the recommended engine maintenance intervals, so fleets can go longer between oil drains intervals and oil and fuel filter changes. Because trucks go longer between trips to the garage for scheduled maintenance, money goes back to your bottom line. 

Horsepower 260-380 hp (194-283 kW)
Peak Torque 860-1250 Lb-Ft
(1166-1696 N●m)
Governed Speed 2100/2200 rpm
Clutch Engagement Torque 575 lb-ft
(780 N●m)
Number of Cylinders 6
Engine Weight (Dry) 1,695 lb  |  769 kg

NOTE: For all engines and options available, horsepower may be limited by the truck OEM

REPTO - Available - Torque limit of 435 lb-ft continuous, 520 lb-ft intermittently, gear drive ratio is 1.15:1, rotation is opposite of the crankshaft

FEPTO - Available - Torque limit up to 210 lb-ft

Engine Model Advertised hp (kW) Peak Torque
Lb-Ft (Nm) @ RPM
380-370 HP Performance Ratings
L9 380 380 (283) 1250 (1695) @ 1200
L9 370 370 (276) 1250 (1695) @ 1200
360-260 HP Productivity Ratings
L9 360 360 (268) 1150 (1559) @ 1200
L9 350 350 (261) 1050 (1424) @ 1200
L9 330 330 (245) 1000 (1356) @ 1200
L9 300 300 (224) 860 (1165) @ 1200
L9 270 270 (201) 860 (1165) @ 1200
L9 260 260 (194) 860 (1165) @ 1200
  • VGT® Turbocharger from Cummins Turbo Technologies - The patented design is widely recognized as an industry performance leader. Electronic actuation improves precision and responsiveness. The VGT Turbo is a key element in providing exceptional fuel economy and braking horsepower
  • Connected Diagnostics™ - Wirelessly connects your engine to Cummins through a telematics device for immediate diagnosis of a fault alert. Provides a clear recommendation for continued operation, or the need for service, within seconds.
  • XPI Fuel System from Cummins Fuel Systems - Delivers superior performance even in lower engine rpm ranges. Enables multiple injection events per cycle, for improved fuel efficiency with quieter, smoother operation.
  • Single Module Aftertreatment From Cummins Emission Solutions -
    Combines high-efficiency SCR, a more reliable dosing unit and a DPF into a single flow-through unit. It is up to 70 percent smaller, so it’s easier to install, and as much as 30 percent lighter than the aftertreatment units it replaces. Better heat management improves fuel efficiency and minimizes periodic maintenance.
  • Fuel Filters And Lube Filters From Cummins Filtration - Fleetguard® filters protect against corrosion and contaminants with innovative technology, including NanoNet® media, which provides 10 times better protection than conventional fuel filters.
  • Single High-Capacity Electronic Control Module (ECM) - A higher capacity offers faster processing of more information, fully integrated control over the engine and aftertreatment system for optimized performance and improved engine lamp strategy.
Maintenance Item Miles/Kilometers Hours Months
*Oil and Filter Up to 50,000 mi
80,000 km
1,500 18
Fuel Filter Up to 50,000 mi
80,000 km
1,500 18
Crankcase Ventilation Filter Maintenance Free
Overhead Adjustment 150,000 mi
240,000 km
5,000 48
DEF Filter 200,000 mi
320,000 km
Particulate Filter Cleaning 200,000 mi
320,000 km

*With a total oil capacity of > 29 quarts (27.4 liters) / duty cycle
Maintenance intervals duty cycle dependent
Consult your chassis and engine owner's manuals for more information.

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