The 3.8-liter, four-cylinder QSF3.8 engine, with horsepower ratings from 85 to 132, meets EPA Tier 4-Final regulations by controlling particulate emissions in-cylinder and using an SCR system to reduce oxides of nitrogen. The SCR system, developed by Cummins Emissions Solutions, is designed to function at reduced exhaust temperatures and to require only minimal doses of die-sel exhaust fluid. According to Cummins, the high efficiency of the SCR system also reduces the volume of exhaust gas being re-circulated by the engine, reducing overall cooling demands.
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