Cummins’ next-generation QSB4.5 engine will meet Tier 4 Final near-zero emissions standards with power increased to 173 hp and a higher peak torque of 520 foot-pounds, the company announced at World of Concrete last week. The 4-cylinder, 4.5-liter engine is enhanced with a Cummins variable-geometry turbocharger enabling the higher ratings of the QSB4.5 to reach performance levels previously associated with a larger 6-cylinder engine, Cummins said.

The VGT technology improves transient response on a fuel-efficient basis, which means a stronger, faster response to increasing load demands compared to Tier 4 Interim units.

EPA Tier 4 Final emissions regulations will take effect Jan. 1, 2014 for engines lower than 174 hp and EU Stage IV will go into effect Oct. 1, 2014.

The ability to move forward to meet near-zero Tier 4 Final emissions standards has been pre-designed into the existing QSB4.5 engine platform, retaining the same cooled exhaust gas recirculation system proven with the current Tier 4 Interim engine. The Cummins Compact Catalyst (CCC) after-treatment is also retained, with the addition of selective catalytic reduction in the exhaust stream. The combined CCC-SCR after-treatment is designed and manufactured by Cummins Emission Solutions.

Cummins is based in Columbus, Ind.