Cummins Westport L9N

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The Cummins Westport L9N is an 8.9-litre, six-cylinder inline natural gas engine for shuttle and school bus, urban transit, vocational and medium and heavy-duty truck and tractor applications. The engine is compatible with compressed natural gas (CNG), liquified natural gas (LNG), and renewable natural gas (RNG). Cummins announced the L9N at the end of 2016, and it replaced the Cummins Westport ISL G in Europe the following year. In North America, the ISL G and its 'Near Zero' counterpart have been replaced by the L9N in 2018.

The L9N uses a three-way catalyst which works by introducing a catalyst to convert the nitrogen oxides to nitrogen gas and oxygen gas, carbon monoxide to carbon dioxide, and hydrocarbons to carbon dioxide and water. The engine also features cooled exhuast gas recirculation (EGR), and spark-ignited stoichiometric combustion. The 2018 L9N is certified for EPA and CARB optional low NOx emissions standards of 0.02 g/bhp-hr, 90% lower than the previous standards.[1]


Model Max. Power Max. revs Max. Torque Emmissions Certifications
L9N 250 250 hp 2200 rpm 730 lb-ft @ 1300 rpm EPA 2017
L9N 260 260 hp 2200 rpm 660 lb-ft @ 1300 rpm EPA 2017
L9N 280 280 hp 2000 rpm 900 lb-ft @ 1300 rpm EPA 2017
L9N 300 300 hp 2100 rpm 860 lb-ft @ 1300 rpm EPA 2017
L9N 320 320 hp 2000 rpm 1000 lb-ft @ 1300 rpm EPA 2017


Cummins logo.png
Current products
Diesel B4.5 / B6.7 - L9 - X12 / X15
CNG B6.7N - ISB6.7 G - ISX12 G - ISX12N - L9N
Former products
Diesel ISB6.7 - ISL9 - ISX12 / ISX15 B5.9 - C8.3 - ISC - ISM - L10 - M11 - NH Series - VTB-903
CNG B5.9G - B Gas Plus - C8.3G - L10G - C Gas Plus - L Gas Plus - ISL G
Propane B LPG Plus