§ 89.416 - Raw exhaust gas flow.

§ 89.416 Raw exhaust gas flow.

The exhaust gas flow shall be determined by one of the methods described in this section and conform to the tolerances of table 3 in appendix A to subpart D:

(a) Measurement of the air flow and the fuel flow by suitable metering systems (for details see SAE J244. This procedure has been incorporated by reference. See § 89.6.) and calculation of the exhaust gas flow as follows:

G_EXHW = G_AIRW + G_FUEL (for wet exhaust mass)

or

V_EXHD = V_AIRD + (−.767) × G_FUEL (for dry exhaust volume)

or

V_EXHW = V_AIRW + .749 × G_FUEL (for wet exhaust volume)

(b) Exhaust mass calculation from fuel consumption (see § 89.415) and exhaust gas concentrations using the method found in § 89.418.

[59 FR 31335, June 17, 1994. Redesignated at 63 FR 56996, Oct. 23, 1998]