Cummins Inc has received certification for its medium-duty ISB engine from the Environmental Protection Agency (EPA). This approval certifies that the ISB complies with the new emission standards that go into effect for these Cummins products Oct 1, 2002, for medium-duty diesel engines in North America. Cummins says it is on schedule to have a full product line available by the deadline.
The 5.9-liter ISB engine is used in trucks, buses, RVs, fire trucks, and step vans. To meet the EPA emissions standard, a cooled exhaust gas recirculation (EGR) subsystem was added. Besides base engine experience in Europe, the new ISB with the cooled EGR subsystem will have more than one million field test miles by the time of production.
This is the second Cummins engine to receive early certification by the EPA at the 2.5-gram NOx + NMHC standard. On April 2, Cummins announced that its ISX engine became the first engine certified to the new EPA standard. Limited production of the 2.5-gram-compliant ISB has already started and will follow a managed ramp-up to full production by October.