ISL9 for Motorhome (2013)


ISL9 for Motorhome (2013)

Power To Tow, Power To Go.


Making the journey as enjoyable as your destination is what the Cummins ISL9 is designed to deliver. The highest power-to-weight ratio in its class means strong towing capability. Enhancements to the turbocharger and control systems deliver better fuel economy and reduced emissions over those of prior models. The ISL9 is designed with heavy-duty features that include replaceable wet liners, roller followers, bypass oil filtration and targeted-piston cooling, for extended life, which is one reason that ISL9-powered motorhomes deliver traditionally higher resale value.


A Cummins-designed and manufactured aftertreatment system is fully integrated, and includes On-Board Diagnostics that continuously monitor engine and aftertreatment performance to ensure near-zero emissions.


Customizing the performance of your engine is possible through the use of Cummins PowerSpec, an online tool that lets you adjust operating parameters to match your need for enhanced fuel economy, higher performance or a balance between the two. See for details.

All of this is backed by unmatched support from the largest service network in North America, including the exclusive Coach Care™ program and 24/7/365 assistance from Cummins Care representatives at 1-800-DIESELS™ (1-800-343-7357).

For Cummins-branded merchandise, electronic tools, literature and more, visit the PowerStore.


Cummins PowerSpec is an electronic tool that makes it possible to tailor the operation of Cummins engines in every on-highway application.

Available for: On-Highway, Recreational Vehicle, Motorhome Engines

See ISX PowerSpec Engine Features


Advertised Horsepower

330-450 hp

246-335 kW

Peak Torque

1,000-1,250 lb-ft

1,356-1,695 N•m

Governed Speed

2,100-2,200 rpm

Clutch Engagement Torque

575 lb-ft

780 N•m

Number of Cylinders


Biodiesel Compatibility

Up to B20

System Weight (dry)

1,912 lb

867 kg

Product Finder Specifications

Certification Level EPA 2013
Power 330 - 450 hp / 246 - 336 kW
Torque 1000 - 1250 lb-ft / 1356 - 1695 N•m


Engine Model

Advertised Horsepower (kW)

Peak Torque lb-ft (N•m) @ rpm

ISL9 450

450 (335)

1250 (1695) @ 1400

ISL9 400

400 (298)

1250 (1695) @ 1400

ISL9 380

380 (283)

1150 (1559) @ 1400

ISL9 350

350 (261)

1000 (1356) @ 1400

ISL9 330

330 (246)

1000 (1356) @ 1400


XPI Fuel System – Delivers superior performance at every speed. Multiple injection events per cycle improve fuel efficiency and enable smoother, quieter operation.

VGT™ Turbocharger From Cummins Turbo Technologies – This patented design is widely recognized as the industry leader for performance. Electric actuation provides quick throttle response and increased braking horsepower.

Cooled Exhaust Gas Recirculation (EGR) – The next-generation system lowers combustion temperatures, for reduced emissions and optimized fuel economy.

High-Capacity Electronic Control Module (ECM) – A single ECM manages the entire engine and aftertreatment system, for optimum performance and fuel economy. This ECM is used across the board for Cummins on-highway engines, to simplify servicing.

Cummins Aftertreatment System From Cummins Emission Solutions – This proprietary system consists of a Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) technology, for near-zero emissions.

Fleetguard®Fuel Filters, Lube Filters And Diesel Exhaust Fluid (DEF) From Cummins Filtration – Fleetguard filters protect against corrosion and contaminants that can cause performance issues. High-quality DEF is readily available at all Cummins distributors, within Cummins Filtration’s vast North American distribution network and at major service stations and truck stops.


Duty Cycles

Miles/ Kilometers


Oil and Filter

20,000 mi / 32,000 km


Fuel Filter*

20,000 mi / 32,000 km


Coolant Filter*

15,000 mi / 24,000 km


Standard Coolant Change

80,000 mi / 128,000km


Overhead Adjustment

150,000 mi / 240,000 km


Coalescing Filter

Every 3rd to 4th oil change


DEF Filter

200,000 mi / 320,000 km


Diesel Particulate Filter

200,000 mi / 320,000 km


*with appropriate filter

Brochures Available

Title Bulletin Number Request View  
Diesel Versus Gasoline RV Flyer 4971524 Request View  Download
ISL9 for RV Applications Spec Sheet (2013) 4971464 Request View  Download
NRP - DPF There Is A Difference Brochure 5410774 Request View  Download
NRP - DPF There Is A Difference Brochure (French) 5410815 Request View  Download
NRP - DPF There Is A Difference Brochure (Spanish) 5410816 Request View  Download
ReCon DPF For EPA 2010 And 2013 ISL Engines Flyer 5410795 Request View  Download
ReCon DPF For EPA 2010 And 2013 ISL Engines Flyer - French 5410796 Request View  Download
ReCon DPF For EPA 2010 And 2013 ISL Engines Flyer - Spanish 5410797 Request View  Download
RV Applications Brochure (2013) 4971462 Request View  Download