§ 86.098-10 Emission standards for 1998 and later model year Otto-cycle heavy-duty engines and vehicles.
Section 86.098–10 includes text that specifies requirements that differ from § 86.096–10. Where a paragraph in § 86.096–10 is identical and applicable to § 86.098–10, this may be indicated by specifying the corresponding paragraph and the statement “[Reserved]. For guidance see § 86.096–10.”
(a)
(1) Except as provided for 2003 and 2004 model years in §§ 86.005–10(f) and 86.1816–05, exhaust emissions from new 1998 and later model year Otto-cycle heavy-duty engines shall not exceed:
(i) For Otto-cycle heavy-duty engines fueled with either gasoline or liquefied petroleum gas, and intended for use in all vehicles except as provided in paragraph (a)(3) of this paragraph.
(A) Hydrocarbons. 1.1 grams per brake horsepower-hour (0.41 gram per megajoule), as measured under transient operating conditions.
(B) Carbon monoxide. (1) 14.4 grams per brake horsepower-hour (5.36 grams per megajoule), as measured under transient operating conditions.
(2) For Otto-cycle heavy-duty engines fueled with either gasoline or liquefied petroleum gas and utilizing aftertreatment technology: 0.50 percent of exhaust gas flow at curb idle.
(C) Oxides of nitrogen (1) 4.0 grams per brake horsepower-hour (1.49 grams per megajoule), as measured under transient operating conditions.
(2) A manufacturer may elect to include any or all of its gasoline-fueled Otto-cycle HDE families in any or all of the NOX or NOX plus NMHC ABT programs for HDEs, within the restrictions described in § 86.098–15 as applicable. If the manufacturer elects to include engine families in any of these programs, the NOX FELs may not exceed 5.0 grams per brake horsepower-hour (1.9 grams per megajoule). This ceiling value applies whether credits for the family are derived from averaging, trading or banking programs.
(3) A manufacturer may elect to include any or all of its liquified petroleum gas-fueled Otto-cycle HDE families in any or all of the NOX or NOX plus NMHC ABT programs for HDEs, within the restrictions described in § 86.098–15 as applicable. If the manufacturer elects to include engine families in any of these programs, the NOX FELs may not exceed 5.0 grams per brake horsepower-hour (1.9 grams per megajoule). This ceiling value applies whether credits for the family are derived from averaging, trading or banking programs.