Perkins’ new 400F, the latest addition to its 400 Series, meets Tier-4 Final/Stage IIIB regulations taking effect January 2013 in the EPA above 25 horsepower and in the EU above 49.5 horsepower. The units are simplified for customers with a 97-percent carryover of components from the previous Tier engine. The after-treatment uses passive regeneration, with systems in place to provide active regeneration capability, effectively burning the soot in the diesel particulate filter, with no impact on the duty cycle. Minimum changes mean little or no redesign for OEMs. The 400 Series improves fuel consumption, minimizes running costs and heat rejection, which offers improved ambient clearance.