QSB4.5 (Tier 4 Final/Stage IV)

Power 121 - 173 hp
90 - 129 kW
Torque 347 - 520 lb-ft
470 - 705 N•m
Certification Tier 4 Final / Stage IV

Overview:

Built To Overachieve.

The 4-cylinder QSB4.5 for Tier 4 Final is more powerful and responsive than ever before, delivering up to 173 hp (129 kW), with a peak torque of 520 lb-ft (705 N•m), a 12 percent increase over that of the previous Tier 4 Interim engine. The Tier 4 Final QSB4.5 shares a similar Cummins VGT Turbocharger, an HPCR fuel system and an ECM with the Cummins QSB6.7 engine. It is not surprising that the QSB4.5's power output is comparable in performance to that of many 6-cylinder engines below 174 hp (130 kW), from a much smaller and lighter package.

SCR is combined with the simplicity of our Diesel Oxidation Catalyst (DOC) as a highly flexible installation package. Used on Tier 4 Interim installations, the DOC is proven to effectively remove Particulate Matter (PM) using simple flow-through passive oxidation. Smaller dimensions than other types of aftertreatment make this catalyst ideal for space-constrained equipment. Together, the DOC and Cummins SCR work as a fully integrated, ultra-clean aftertreatment system. Extremely robust packaging ensures that the aftertreatment system achieves durability equal to that of the QSB4.5 engine. This is the first application of our award-winning VGT Turbocharger technology on a 4-cylinder engine.

Cummins patented sliding nozzle technology has fewer wear sites than any other variable turbine design, bringing unprecedented durability while providing precise adjustment of airflow delivered to the engine, enabling rapid boost at low engine rpm while maintaining a high level of boost at higher rpm. The QSB4.5 brings the simplicity of a single turbocharger, in contrast with other 4-cylinder engines requiring two turbochargers to achieve equivalent power, torque and altitude capability. Mid- and high-mount options provide design flexibility, for easier machine integration.

The SCR system on the QSB4.5 has been configured specifically for this engine by CES, with the catalytic reaction occurring even at low operating temperatures. DEF dosing levels are minimized with enhanced mixing into the exhaust flow. A Cummins Direct Flow air cleaner helps make installation easier with a significantly reduced space claim and higher filtration capacity.

Inline 4-cylinder design, 4.5 liter displacement, EPA Tier 4 Final/EU Stage IV

Engine Model Maximum Power Output
hp (kW) @ rpm
Peak Torque
lb-ft (N•m) @ rpm
Turbocharger Aftertreatment
QSB4.5 173 173 (130) @ 2100 520 (705) @ 1500 Variable Geometry Turbocharger Cummins Compact Catalyst + SCR
QSB4.5 173 173 (130) @ 2000  520 (705) @ 1500   Variable Geometry Turbocharger   Cummins Compact Catalyst + SCR 
QSB4.5 163   168 (126) @ 2300   466 (632) @ 1500   Variable Geometry Turbocharger   Cummins Compact Catalyst + SCR 
QSB4.5 160   163 (122) @ 2200   460 (624) @ 1500   Variable Geometry Turbocharger  Cummins Compact Catalyst + SCR
QSB4.5 160   165 (123) @ 2000   460 (624) @ 1500   Variable Geometry Turbocharger  Cummins Compact Catalyst + SCR 
QSB4.5 155   155 (116) @ 2000   460 (624) @ 1500   Variable Geometry Turbocharger  Cummins Compact Catalyst + SCR 
QSB4.5 140   142 (106) @ 1800   457 (620) @ 1500   Variable Geometry Turbocharger  Cummins Compact Catalyst + SCR 
QSB4.5 130   140 (105) @ 2400   457 (620) @ 1500   Variable Geometry Turbocharger  Cummins Compact Catalyst + SCR 
QSB4.5 130   130 (97) @ 2300   387 (525) @ 1500   Variable Geometry Turbocharger  Cummins Compact Catalyst + SCR 
QSB4.5 130   140 (105) @ 2000   520 (705) @ 1500   Variable Geometry Turbocharger  Cummins Compact Catalyst + SCR 
QSB4.5 121   121 (90) @ 2200   347 (470) @ 1500   Variable Geometry Turbocharger  Cummins Compact Catalyst + SCR 


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