Diesel engine QSF3.8 series

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Compact Power Redefined. Achieving near-zero emissions levels in an engine delivering 74 hp to 130 hp (55-98 kW) without compromising power, performance or fuel economy is a big challenge. Yet that’s exactly what Cummins engineers have achieved in the QSF3.8 – without the need to add a DPF to the aftertreatment system. At 74hp, the QSF3.8 uses a simple “fit and forget” Diesel Oxidation Catalyst (DOC). Cummins DOC, a flow-through device requiring no ash-cleaning service, no sensors and no operational lamps in the equipment cab, enables a smaller, easier and more flexible equipment installation than Diesel Particulate Filters (DPF) typically used by many other engines below 75 hp looking to meet the requirement for near-zero emissions. From 100-130 hp, the QSF3.8 is paired with a Diesel Oxidation Catalyst and Selective Catalytic Reduction (DOC-SCR) system designed by Cummins Emission Solutions (CES). Cummins SCR enables oxides of nitrogen (NOx) conversion to take place at lower exhaust temperatures. CES has manufactured over 1 million SCR systems – and has more experience with this technology than any other company. The Cummins SCR system features a decomposition tube designed to enable more effective mixing of the Diesel Exhaust Fluid (DEF) ahead of the catalyst. Additionally, for certain applications, the QSF3.8 can be paired with an SCR-only aftertreatment system.