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Power to Move the Masses

Whether it’s a 60-foot articulated transit bus with an L9™, a Class-D school bus with a B6.7™ or an airport shuttle with an ISB6.7 G, Cummins offers the widest range of power choices in the transportation industry, from diesel to natural gas to hybrid engines. Under the Smart Efficiency™ initiative, these engines focus on improved uptime, lower total cost of operation (TCO) and better fuel efficiency.

Transit Applications
Cummins L9 – One of the most popular engines in transit bus applications is the Cummins L9 diesel. The L9 used for 2017 transit applications will utilize an isolated coolant loop for transit buses, improving reliability and reducing downtime. A water-to-water heat exchanger will be mounted on the L9, and will provide heat to the passenger compartments as needed while providing a self-contained coolant flow to the engine compartment area. This new approach reduces potential coolant leakage and air infiltration, for better Exhaust Gas Recirculation (EGR) cooler reliability and durability.

In keeping with the Smart Efficiency initiative, the Cummins L9 used in transit buses will continue to use the modular aftertreatment architecture rather than the Single Module™ unit used in trucking and school bus applications. That’s because the transit duty cycle provides unique challenges in creating consistent exhaust temperatures required for passive Diesel Particulate Filter (DPF) regeneration. Cummins is leveraging the current product experience and particulate matter (PM) storage capacity of the modular aftertreatment system as a means to improve uptime and reliability.

Cummins Westport ISL G – For transit districts in which air-quality issues are of paramount importance, the Cummins Westport ISL G is the natural choice. The combination of a robust diesel platform, together with advanced Stoichiometric Exhaust Gas Recirculation (SEGR) enable the ISL G and the ISL G NZ (near-zero) to help municipalities enhance their public profile with clean technology and domestically sourced natural gas.

B6.7 Hybrid – In transit applications, the B6.7 hybrid system provides up to 5 percent fuel-economy improvements compared with the 2013 ISB6.7 hybrid. This is a result of an enhanced VGT Turbocharger, reduced friction and better thermal management.

The B6.7 hybrid is currently available with a 280-hp, 660-lb-ft torque rating. Starting in January 2017, the B6.7 hybrid engine system will use the Single Module aftertreatment system, which will provide up to a 70 percent reduction in space claim, reduce weight by up to 30 percent and provide better heat management and retention, for improved fuel economy. The B6.7 hybrid system operates at consistent engine speeds and temperatures, providing a perfect match for the application of the Single Module aftertreatment system.

School Bus Applications – In the school bus market, Smart Efficiency focuses on improved uptime, reliability and fuel economy. Cummins full 2017 school bus engine lineup includes the V5.0, ISB6.7 G, the 2017 B6.7, the 2017 L9 and the ISL G Near Zero (NZ) natural gas engine, providing an optimal solution for every school district.

All of these engines utilize common architecture for proven performance with simplified service. All feature an integrated design, for optimum performance and efficiency. All are compatible with Cummins Connected Solutions,™ which provides real-time engine fault code analysis, probable diagnosis and recommended actions for school buses equipped with a telematics service. And all are backed by the biggest and best service support network in North America. Additional details are in the STN Expo article earlier in this newsletter. More information can also be found in the 2017 School Bus Market Brochure.

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