Cummins L9

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The Cummins L9 is an 8.9 litre, inline six cylinder diesel engine available for medium-duty trucks and urban transit buses. Introduced at the National Truck Equipment Association Work Truck Show in March 2016 and available beginning in 2017, the L9 is the successor to the Cummins ISL.[1]

New for Cummins' 2017 line of engines is a Single Module aftertreatment system which combines the Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) systems into a single canister. The more compact, lighter emissions control systems, according to Cummins, also boast greater thermal efficiency for improved engine operation.[2] Unique to the transit applications, the L9 will continue to use the Modular Aftertreatment System.[3]

The Cummins L9 features enhanced on-board diagnostics (OBD) that ensure emissions stay within the EPA limits as well as enhanced electronic controls. Cummins has also added a particulate matter sensor. The engine meets EPA 2016 and GHG 2017 regulations. It boats a 15 percent improvement in fuel economy over the 2007 ISL.[2] Engine electronic controls and optimized combustion formula help achieve Euro 6 Phase-C compliance.[4] Further electronics refinement allowed the L9 to meet the more stringent Euro 6 Phase-D regulations in 2019. Phased-D required reduced Oxides of Nitrogen (NOx) emissions during lower speed city operations, as well as under cold engine start conditions. Real-world, on-road testing was also required during testing.[5]

Models for Transit Bus

Model Max. power Max. revs Max. torque Emmissions certifications
L9 280 280hp 2200 rpm 900 lb-ft @ 1300 rpm EPA 2017
L9 330 330hp 2200 rpm 1100 lb-ft @ 1400 rpm EPA 2017
L9 330H Up to 330 hp 2200 rpm Up to 1100 lb-ft @ 1000 rpm EPA 2017

Models for Motorcoach

Model Max. power Max. revs Max. torque Emmissions certifications
L9 350 350 hp 2100 rpm 1150 lb-ft @ 1300 rpm EPA 2017
L9 380 380hp 2100 rpm 1250 lb-ft @ 1400 rpm EPA 2017
L9 330H Up to 330 hp 2200 rpm Up to 1100 lb-ft @ 1000 rpm EPA 2017


References

  1. Redefining Classics: Cummins Introduces The Next Generation Of Iconic Midrange Engines. 01 March 2016. Press release. Cummins. Retrieved on 21 December 2016.
  2. 2.0 2.1 2017 Cummins L9 brochure. 2016. Cummins. Retrieved on 21 December 2016.
  3. Cummins Announces 2017 Engine Lineup for Transit. 16 May 2016. Press release. Retrieved on 21 December 2016.
  4. “CUMMINS BRING EURO 6 SMART EFFICIENCY TO FIAA SHOW.” Press release. Cummins, 23 May 2017.
  5. “Cummins Takes a Euro VI Step Ahead with Phase-D Certified Diesels.” Press release. Cummins, 07 June 2019.


v·d·e
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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