The Cummins ISL is an 8.9 litre, inline six cylinder diesel engine. Introduced (for buses) in 1999, the ISL was designed to bridge a gap in Cummins' line of engines that the discontinuation of L10 had left, however it is not a direct descendant of the L10 and has more in common with the ISC.
The EPA 2004 compliant ISL was introduced in October 2002 and met the limits of 2.5 g/hp-hr of nitrogen oxide (NOx) and nonmethane hydrocarbons (NMHC) and 0.1 g/hp-hr of particulate matter. Cummins updated the ISL with a High-Pressure Common-Rail (HPCR) injection system and a variable geometry turbocharger to improve the performance of the engine.
The EPA 2007 standards set a limit of 0.01 g/hp-hr of particulate matter. The ISL features a particulate filter and a crankcase coalescing filter to control emissions. During the phase-in period between 2007 and 2009, Cummins produced 50% of their engines to meet EPA 2010 regulations. The EPA set 2010 NOx emission at 0.2 gr/hp-hr. Cummins employed selective catalytic reduction (SCR), which was already used in Europe to meet the Euro 4 levels, to reduce NOx emissions. Cummins announced on January 8, 2010 that the ISL9, as it is now known, received EPA 2010 certification.
|Model||Max. power||Max. revs||Max. torque||Emmissions certifications|
|ISL 250||250 hp||2200 rpm||730 lb-ft @ 1300 rpm||EPA 2004, EPA 2007|
|ISL 280||280 hp||2200 rpm||900 lb-ft @ 1300 rpm||EPA 2004, EPA 2007|
|ISL 330||330 hp||2200 rpm||1100 lb-ft @ 1300 rpm||EPA 2004, EPA 2007|
|ISL9 250||250 hp||2200 rpm||730 lb-ft @ 1300 rpm||EPA 2010|
|ISL9 280||280 hp||2200 rpm||900 lb-ft @ 1300 rpm||EPA 2010|
|ISL9 330||330 hp||2200 rpm||1100 lb-ft @ 1400 rpm||EPA 2010|
|ISL9 330 H||330 hp||2200 rpm||1050 lb-ft @ 1500 rpm||EPA 2010, EPA 2021|
|ISL9 380||380 hp||1900 rpm||1250 lb-ft @ 1696 rpm||EPA 2013|
|ISLe||350 hp||2100 rpm||1550 Nm||Euro 2|
|ISLe||209-260 hp||2100 rpm||1550 Nm||Euro 3|
|ISLe||280-400 hp||2100 rpm||1700 Nm||Euro 4, Euro 5|
|L9 280 (2021)||280 hp||1900 RPM||925 lb-ft (1254) @ 1200 Nm||EPA 2021|
|L9 350 (2021)||350 hp||1900 RPM||1150 (1559) @ 1200||EPA 2021|
- Helpful Cummins ISL Information, dieselserivceparts.com. Retrieved on 2009-06-03
- Cummins Receives EPA 2010 Certification for Heavy-Duty and MidRange Engines (Press Release). 8 January 2010. Retrieved on 23 April 2012.