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More Power For Cummins QSB4.5

Posted on February 1, 2013

Cummins has announced that the next-generation QSB4.5 engine will meet Tier 4 final near- zero emissions standards with top-rated power increased to 173 hp (129 kW) and a higher peak torque of 520 lb.ft. (705 Nm). The four-cylinder, 4.5 L engine has been performance enhanced with a Cummins variable geometry turbocharger, which the company said enables the engine to meet performance levels previously associated with six-cylinder engines.

At lower ratings down to 121 hp (90 kW), Cummins said the VGT technology improves transient response on a fuel efficient basis. The engine also retains the cooled exhaust gas recirculation (EGR) system from the Tier 4 Interim engine, along with the Cummins Compact Catalyst (CCC) aftertreatment, which will be combined with selective catalytic reduction (SCR) for Tier 4 final. The combined CCC-SCR aftertreatment is designed and manufactured by Cummins Emission Solutions and is available in multiple configurations including switchback, horizontal and vertical formats intended to provide an easier and more flexible installation.

The QSB4.5, together with the recently announced QSF3.8 and QSF2.8, extend Cummins Tier 4 final four-cylinder engine range to 49 to 173 hp (37 to 129 kW). The engines target a broad range of applications, including skid-steer loaders, telehandlers, compact excavators and loaders, forklifts and compactors.