L9N

The 2018 L9N continues the evolution of emission leading natural gas engines from Cummins Westport. Certified to the California Air Resources Board and Environmental Protection Agency's (EPA) Optional Low NOx emissions standard of 0.02 g/bhp-hr, it has 90% fewer NOx emissions than the current North American EPA standard. Offering 320 hp / 1,000 lb-ft torque, with improved performance and reliability, the near-zero emissions L9N is a great fit for transit, refuse, and truck applications.

Download Brochure

NOx emission 0.02 g / bhp-hr. (90% below EPA)
Maximum Horsepower 320 HP | 239 kW
Peak Torque 1,000 LB-FT | 1,356 Nm
Governed Speed 2200 RPM
Type 4-cycle, spark-ignited, in-line
6 cylinder, turbocharged, CAC
Engine Displacement 540 CU IN | 8.9 LITERS
Number of Cylinders 6
Operating Cycles 4
Net Weight (dry) 1,625 lb | 737 KG
Fuel Type CNG / LNG / RNG
Aftertreatment Three-Way Catalyst
Base Warranty 2 Years, 250,000 Miles
(402,336 KM) Truck
2 Years, Unlimited Miles
Transit/Shuttle
Engine Model Advertised Horsepower
(kW) @ rpm
Peak Torque 
lb-ft (N•m) @ rpm
Governed
Speed
Truck & Refuse    
L9N 250 250 (186) @ 2200 730 (990) @ 1300 2200 rpm
L9N 260 260 (194) @ 2200 660 (895) @ 1300 2200 rpm
L9N 280 280 (209) @ 2000 900 (1220) @ 1300 2200 rpm
L9N 300 300 (224) @ 2100 860 (1166) @ 1300 2200 rpm
L9N 320 320 (239) @ 2000 1000 (1356) @ 1300 2200 rpm
School & Shuttle Bus    
L9N 250
250 (186) @ 2200 730 (990) @ 1300 2200 rpm
L9N 260 260 (194) @ 2200 660 (895) @ 1300 2200 rpm
L9N 280 280 (209) @ 2000 900 (1220) @ 1300 2200 rpm
L9N 300 300 (224) @ 2100 860 (1166) @ 1300 2200 rpm
Transit Bus    
L9N 280 280 (209) @ 2000 900 (1220) @ 1300 2200 rpm
L9N 320 320 (239) @ 2000 1000 (1356) @ 1300 2200 rpm

L9N Truck < 66,000 lbs (29,937 kg) GCVW

Maintenance Item^ Hours Distance Months
Oil And Filter* 500 15,000 mi (24,000 km) 6
Coolant Filter 500 15,000 mi (24,000 km) 6
Fuel Filter 1,000 30,000 mi (48,000 km) 9
Spark Plugs 1,500 45,000 mi (72,000 km) 12
Closed Crankcase Ventilation Filter 2,000 60,000 mi (96,000 km) 18
Cooling System Flush 2,000 60,000 mi (96,000 km) 18
Overhead Set Adjustment** 2,000 60,000 mi (96,000 km) 18
Ignition Coil Extension 10,000 300,000 mi (480,000 km) 5 yrs
Air cleaner / element Follow manufacturer's published recommendations

Consult your Owners or Operation and Maintenance manual for the complete daily and routine maintenance schedule
^Based on a duty cycle of 30 mph / 48 kph average speed. Distance intervals may decrease based on average speed.
*Requires Natural Gas Engine Oil    **Initial overhead set adjustment at 1,000 hours.

 L9N Urban Transit and Refuse Truck  

Maintenance Item^ Hours Distance Months
Oil And Filter* 500 7,500 mi (12,000 km) 6
Coolant Filter 500 7,500 mi (12,000 km 6
Fuel Filter 1,000 15,000 mi (24,000 km) 9
Spark Plugs 1,500 22,500 mi (36,000 km) 12
Closed Crankcase Ventilation Filter 2,000 30,000 mi (48,000 km) 18
Cooling System Flush 2,000 30,000 mi (48,000 km) 18
Overhead Set Adjustment** 2,000 30,000 mi (48,000 km) 18
Ignition Coil Extension 10,000 150,000 mi (240,000 km) 5 yrs
Air cleaner / element Follow manufacturer's published recommendations

 Consult your Owners or Operation and Maintenance manual for the complete daily and routine maintenance schedule
 ^Based on a duty cycle of 15 mph / 24 kph average speed. Distance intervals may decrease based on average speed.
*Requires Natural Gas Engine Oil    **Initial overhead set adjustment at 1,000 hours.

  • Electronic Control Module: A new engine control module, CM2380, provides full monitoring and control of the engine sensors, and the fuel and ignition systems. It offers faster processing to support heavy duty On-Board Diagnostics requirements (500K baud rate). It is also telematics capable, and provides improved diagnostics and durability.
  • On-Board Diagnostics (OBD): The OBD system continuously monitors the engine and after-treatment system. It gives the vehicle owner or repair technician electronic access to the status of various vehicle subsystems for diagnostic purposes.
  • Closed Crankcase Ventilation (CCV) system: The CCV system reduces engine emissions by capturing crankcase emissions and rerouting these gases back to the engine. This results in more complete combustion and lower emissions.
  • Enhanced Three-Way Catalyst (TWC): TWCs are effective, simple, passive devices. They provide consistent emissions control performance, are maintenance-free and can be mounted vertically or horizontally on the vehicle. No active aftertreatment such as a diesel particulate filter or selective catalytic reduction is required.

  • High-Energy Ignition System – A new Ignition Control Module (ICM) provides better performance and improved spark plug and coil durability, plus self-diagnostics.