tier 4 final regulation chartTier 4 Final makes a significant leap in reducing these emissions with a 55% reduction in NOx emissions and an 80% reduction in PM emissions compared to Tier 2 levels.

This is a significant change for high horsepower markets – but with Cummins, it’s simple!

Tier 4 Final affects the Cummins high horsepower engine family, which includes the QSK19, QSK23, QST30, QSK38, QSK50, QSK60, QSK78 and QSK95. These engine platforms will optimize in-cylinder diesel combustion and utilize Selective Catalytic Reduction (SCR) to meet Tier 4 Final emissions, all the while maximizing productivity and maintaining the reliability customers have come to depend on across a wide range of machines, rugged duty cycles and tough environments.

Building on the legendary reliability of Cummins industrial engines, Cummins Tier 4 Final engines and aftertreatment components form a fully integrated engine system from intake to exhaust. This improved combustion technology controls PM and the SCR reduces NOx emissions, allowing Cummins Tier 4 engines to meet Tier 4 emissions with no major changes to the engine itself or service intervals - all while reducing fuel consumption and maintaining Tier 2 levels of performance and durability.

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