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.

The Cummins B3.3 engine brings toughness and reliability to every piece of equipment it powers, from tractors to irrigation pumps. Its in-line 4-cylinder design has a compact footprint for easy installation. Ratings range from 60-85 hp, with both naturally aspirated and turbocharged versions that deliver strong performance. Single-sided maintenance is just one of many standard features and options that let you customize your B3.3.