QSB4.5-C110 Original Imported Cummins Complete Engine QSB4.5 QSB 4 Stroke

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 163 hp (82 to 126 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 35 percent 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 System electronic controls, managing all components for a completely integrated system with the impressive reliability and durability and long maintenance intervals you expect from the industry’s Tier 4 technology leader.

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.