Cummins next generation 4-cylinder QSB4.5 engine will meet U.S. EPA Tier 4 Interim and EU Stage IIIB off-highway low emission regulations in 2012 with our proven 4.5-liter engine platform and a fully integrated system from air-intake to exhaust aftertreatment.

The QSB4.5 achieves these very low emission standards by using our proven cooled Exhaust Gas Recirculation (EGR) and Cummins Particulate Aftertreatment.  Both systems have been specifically developed to maintain its compact design ensuring the most space efficient installation and premium performance for every application. 

Cummins cooled EGR coupled with our High Pressure Common Rail (HPCR) fuel system provides a cleaner and more efficient combustion resulting in up to 5 percent better fuel efficiency* compared to the Tier 3 / Stage IIIA engine.  With better fuel efficiency and ratings that extend from 110 to 160 hp (82 to 119 kW), the QSB4.5 provides the lowest cost of ownership while retaining a power band that offers improved torque delivery.

Tier 4 Interim and Stage IIIB performance-enhancing features include Cummins Direct Flow air filtration system providing a smaller installation profile than radial air filters, plus improved filtration efficiency.  The new Variable Flow Turbocharger with electronic control managing the cooled EGR flow across the entire rpm range.  The engine also incorporates a crankcase ventilation system with a highly-efficient coalescing filter for cleaner engine operating conditions.  Cummins combines full-authority Quantum electronic controls, managing all components for a completely integrated system.

With the next generation QSB4.5, you get premium performance, reduced maintenance and exceptional global customer support with the same reliability and dependability our customers have come to expect from our Tier 3 platform.

Want to know what up to 5 percent better fuel efficiency will mean for your bottom line?  Visit the Fuel Duel page to find out.

Read more about Cummins Tier 4 Products in the Tier 4 Product Brochure and read about our customers’ field test success in the Tier 4 Testimonial Brochure.

*Depending on duty cycle and installation optimization.