Retrofit/Rebuild Requirements for 1993 and Earlier Model Year Urban Buses; Public Review of a Notification of Intent to Certify Equipment

Résumé

Detroit Diesel Corporation (DDC) has submitted to the Agency a notification of intent to certify urban bus retrofit/rebuild equipment to a 0.1 gram per brake-horsepower-hr(g/bhp-hr) particulate matter (PM) standard pursuant to 40 CFR Part 85, Subpart O. The equipment, referred to by DDC consists of the base engine components used on the 25% reduction retrofit/rebuild kit certified by DDC (October 2, 1995), components from the 25% retrofit catalyst kit previously certified under the program by Engine Control Systems, Ltd. (January 6, 1997), and a TurboPac supercharger system supplied by Turbodyne Systems, Inc. which supplies additional charge air during engine acceleration. The candidate kit is applicable to all 6V-92TA MUI engine models made by DDC for model years 1979 to 1989 and equipped with mechanical unit injectors (MUI). DDC intends this equipment to be certified to the particulate matter level of 0.10 g/bhp-hr. If the Agency certifies that this equipment complies with the 0.10 g/bhp-hr level, then operators with affected engines will have the choice of using this equipment or other equipment that is already required for use and certified to the 0.10 g/ bhp-hr standard within