QSB6.7 Cummins QSB6.7 Specifications & Technical Data (2017—2026)

Variable Flow Turbocharger

The new variable flow turbocharger with electronic control optimizes the cooled-EGR flow across the entire rpm range. Variable flow turbocharging provides increased airflow efficiency compared with a wastegate turbocharger.

VGT Turbocharger

Improved fuel efficiency isn’t the only benefit that the new QSL9 and QSB6.7 engines have to offer. The fuel systems are complemented by our patented VGT Turbocharger, which continuously varies the airflow boost to precisely match engine rpm and load demands for optimal performance.

Cummins Tier 4 Interim Solution

For equipment manufacturers, Cummins Tier 4 Interim solution means a user-friendly, fully integrated air-intake-to-exhaust aftertreatment system designed to minimize space and optimize performance for every installation. Unique in the industry, Cummins designs and manufactures the key enabling technologies for Tier 4 Interim, including our own exhaust aftertreatment. For equipment operators, Cummins Tier 4 Interim means a lower cost of operation with better performance and the same level of durability as our class-leading Tier 3/Stage IIIA engines.

Cummins QSB4.5 and QSB3.3

Cummins next-generation QSB4.5 and QSB3.3 continue to deliver the ideal solution for customers looking for a compact package with Tier 4 Interim technology specifically developed for 4-cylinder platforms. The QSB4.5 and QSB3.3 leverage Cummins fully integrated system from air intake to exhaust aftertreatment, delivering up to 5% better fuel economy in order to lower operating costs and improve your bottom line.

Cummins Compact Catalyst

The QSB4.5 and QSB3.3 achieve very low PM emissions using the Cummins Compact Catalyst exhaust aftertreatment. The system is maintenance-free and offers a space-efficient installation profile. Cummins proven EGR system is utilized for NOx reduction.

Advanced Filtration

Tier 4 Interim and Stage IIIB performance-enhancing features include the Fleetguard® Direct Flow™ air filtration system, providing a smaller installation profile than radial air filters and adding improved filtration efficiency. The engines incorporate a crankcase ventilation system with a highly efficient coalescing filter for cleaner engine operating conditions.

High Pressure Common Rail (HPCR) - QSB4.5 and QSB3.3

Cummins cooled EGR, coupled with our HPCR fuel system, provides cleaner and more efficient combustion, resulting in up to 5% better fuel efficiency compared with the Tier 3/Stage IIIA engines. With better fuel efficiency and ratings that extend from 110 hp to 163 hp (82-122 kW) for the QSB4.5 and 75 hp to 120 hp (90 kW) for the QSB3.3, these engines provide the lowest cost of ownership while retaining a high power output for engines of their size.

Cummins QSL9 and QSB6.7

Cummins QSL9 and QSB6.7 for Tier 4 Interim/Stage IIIB are designed to take on your toughest jobs with a fully integrated system from air intake to exhaust aftertreatment. We’ve enhanced every aspect of our existing Tier 3 engines. This results in the QSL9 and QSB6.7 delivering up to 5% better fuel economy, which lowers your operating costs and improves your bottom line. The QSL9 is now available with a wider power range, from 240 to 400 hp (179-298 kW) peak power.

Exhaust Aftertreatment

The proven Cummins Particulate Filter reduces particulate matter by over 90%. The Cummins Particulate Filter has been specifically developed for industrial applications, delivering premium performance and durability you can depend on.

Cummins Compact Catalyst for QSB6.7

For ratings below 174 hp (130 kW), the QSB6.7 utilizes the Cummins Compact Catalyst specifically designed for more space-constrained applications.

High Pressure Common Rail (HPCR) - QSB6.7

The QSB6.7 engine combines cooled EGR with an improved High Pressure Common Rail (HPCR) fuel system, enabling cleaner and more efficient combustion and resulting in better fuel economy without compromising performance.

Xtra-High Pressure Injection (XPI) Fuel System

The Tier 4 Interim/Stage IIIB QSL9 engine incorporates Cummins XPI fuel system, enabling very high fuel injection pressure across all engine rpm speeds, providing cleaner combustion and improved engine response.

Exhaust Gas Recirculation (EGR)

The QSL9 and QSB6.7 meet very low emissions standards by using our proven cooled EGR to reduce NOx emissions by 45%.

Electronic Management

Cummins Electronic Control Module (ECM) manages all components for a completely integrated system and assures the impressive reliability, durability, and long maintenance intervals you expect from the industry’s technology leader.