Engine supplier Cummins Inc. announced that it has received Environmental Protection Agency (EPA) certification for its medium-duty ISB engine, as Cummins and its competitiors strive to meet stringent new federal standards that ultimately will have a significant effect on the cost of all diesel-powered motorhomes.
The EPA approval certifies that the ISB complies with the new emission standards that go into effect for diesel engine builders on Oct. 1.
By that deadline, diesel engine manufacturers must reconfigure their power plants to comply with a 2.5-gram-per-brake horsepower NOx+NMHC emission standard. By 2007, they are to eliminate 90% to 95% of noxious gases and particulate matter.
Prior to the ISB certification, Cummins was reported to have been the first company to have one of its commercial truck engines – an ISX prototype with horsepower variants ranging from 400hp to 600hp – certified by the EPA prior to the October deadline. Another Cummins model expected to make the grade by the target date is the company’s 11.0-liter ISM.
“Cummins’ short-term approach to cleaning up its engines has involved using cooled exhaust gas recirculation (EGR) systems, variable-geometry turbochargers and several other modifications,” reports Kevin Goen, general manager of automotive medium-duty sales and marketing for Columbus, Ind.-based Cummins. “With these adjustments, performance has not suffered while fuel mileage has remained about the same. Our charges per-engine to chassis OEMs, on the other hand, are expected to rise approximately 12% to 17%.”