§ 86.008-10 Emission standards for 2008 and later model year Otto-cycle heavy-duty engines and vehicles.

This section applies to new 2008 and later model year Otto-cycle heavy-duty engines and vehicles. Starting in model year 2021, this section applies to light HDE and medium HDE, but it no longer applies to heavy HDE (see 40 CFR 1036.140(a) and 1036.150(c)).

(a)

(1) Exhaust emissions from new 2008 and later model year Otto-cycle HDEs shall not exceed:

(i)

(A) Oxides of Nitrogen (NOX). 0.20 grams per brake horsepower-hour (0.075 grams per megajoule).

(B) A manufacturer may elect to include any or all of its Otto-cycle HDE families in any or all of the NO_X and NO_X plus NMHC emissions ABT programs for HDEs, within the restrictions described in § 86.008–15 or § 86.004–15. If the manufacturer elects to include engine families in any of these programs, the NO_X FEL may not exceed 0.50 grams per brake horsepower-hour (0.26 grams per megajoule). This ceiling value applies whether credits for the family are derived from averaging, banking, or trading programs. The NO_X FEL cap is 0.80 for model years before 2011 for manufacturers choosing to certify to the 1.5 g/bhp-hr NO_X + NMHC standard in 2003 or 2004, in accordance with § 86.005–10(f).

(ii)

(A) Nonmethane hydrocarbon (NMHC) for engines fueled with gasoline. 0.14 grams per brake horsepower-hour (0.052 grams per megajoule).

(B) Nonmethane-nonethane hydrocarbon (NMNEHC) for engines fueled with natural gas or liquefied petroleum gas. 0.14 grams per brake horsepower-hour (0.052 grams per megajoule).

(C) Nonmethane hydrocarbon equivalent (NMHCE) for engines fueled with methanol. 0.14 grams per brake horsepower-hour (0.052 grams per megajoule).

(D) A manufacturer may elect to include any or all of its Otto-cycle HDE families in any or all of the hydrocarbon emission ABT programs for HDEs, within the restrictions described in § 86.007–15 or § 86.004–15. If the manufacturer elects to include engine families in any of these programs, the hydrocarbon FEL may not exceed 0.30 grams per brake horsepower-hour. This ceiling value applies whether credits for the family are derived from averaging, banking, or trading programs. The hydrocarbon FEL cap is 0.40 for model years before 2011 for manufacturers choosing to certify to the 1.5 g/bhp-hr NO_X + HC in 2004, as allowed in § 86.005–10.