Cummins Engines for School Bus

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2013 ISL9, ISB6.7 and ISL G. Better. Where It Counts.
Cummins offers three different engines that are widely used in school bus fleets. Two are clean diesels – the ISB6.7 and the ISL9, which replaces the ISC8.3. The third is our natural gas Cummins Westport ISL G.

Better On The Budget. All of these engines help you reduce fuel expenses as well as greenhouse gases (GHG). Cummins is boosting the industry-leading fuel economy of our 2013 ISB6.7 and ISL9 engines up to 2% higher versus 2010 models. How? The addition of an air intake throttle makes our EGR system more efficient, while the VGT™ Turbocharger on the ISL9 has been modified for greater efficiency as well. The reduction in parasitic losses increases fuel economy and lowers operating costs. The Cummins Westport ISL G takes advantage of an abundance of domestically produced natural gas, which results in lower fuel prices.

You won’t find cleaner school bus engines than the ISB6.7, ISL9 and ISL G in North America.

Our Fuel and DEF Usage Calculator shows how much you can save and the reduction in greenhouse gases as a result of lower fuel usage.

Better Reliability And Durability. Cummins designs, develops and supports virtually every component from air handling to exhaust aftertreatment as a totally integrated system. This allows us to optimize every function, better than other engine manufacturers.

The ISL9, ISB6.7 and ISL G will meet 2014 Environmental Protection Agency (EPA) and United States Department of Transportation (DOT) regulations for fuel economy and greenhouse gas reduction, a year ahead of schedule. We have done so without major hardware changes – so you can expect the same proven reliability and durability as current model engines.

The proven Cummins Aftertreatment System on the ISB6.7 and ISL9 uses a Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) technology, all managed to maximize efficiency and lower emissions. This system virtually eliminates NOx through the injection of a small amount of Diesel Exhaust Fluid (DEF) upstream of the catalyst. On-Board Diagnostics are being added in 2013 to continuously monitor the performance of the emissions system, alerting the driver when it needs troubleshooting and possible repair. Cummins will be using an On Board Diagnostics system already proven in thousands of on-road vehicles since 2007.

The ISL G uses a maintenance-free Three-Way Catalyst (TWC) which is packaged as part of the muffler. Combined with Stochiometric cooled Exhaust Gas Recirculation (SEGR), it gives the ISL G optimal performance with near-zero emissions.

Better Coverage. Cummins engines feature the most comprehensive base warranty in the industry, and our new extended coverage plans with up to 10 years of coverage is evidence of our complete confidence in their robust design and quality manufacturing.

Better Customer Care. Cummins-powered buses are backed by the largest and most capable parts and service network in North America, with over 3,500 locations. Our authorized service technicians are fully trained on all of our engines and have the necessary equipment and Genuine Cummins Parts to promptly handle any type of service issue.

Call 1-800-DIESELS™ (1-800-343-7357) for information and service locations.

Cummins is putting better where it counts. In every school bus.

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