Detroit Diesel engine enhancements reduce emissions

Detroit Diesel Corporation (DDC) announced that beginning in October 2002, further enhancements to its Series 50 engine will enable it to meet more stringent exhaust emissions standards of 2.5 gm/bhr-hr Nox + NMHC. The enhancements include new DDEC software for exhaust gas recirculation (EGR) control, a higher efficiency EGR cooler, steel pistons for improved durability, and new exhaust after-treatment systems. These newer technologies will provide up to a 90% reduction in particulate exhaust emissions and a 50% reduction in NOx emissions compared to engines produced as recently as 1999. An oxidation catalyst exhaust after-treatment system will be used to meet the 49-state, 0.05 gm/bhp-hr particulate EPA urban bus standard.