(a) General requirements. Calculate all volumes and volumetric flow rates at standard conditions for temperature and pressure (0 °C and 101.3 kPa), and these conditions must be used consistently throughout all calculations.

(b) Engine test conditions. Measure the absolute temperature (designated as T and expressed in Kelvin) of the engine air at the inlet to the engine, and the dry atmospheric pressure (designated as p and expressed in kPa), and determine the parameter f according to the following provisions:

(1) Naturally aspirated and mechanically supercharged engines:

eCFR graphic er17jn94.008.gif

(2) Turbocharged engine with or without cooling of inlet air:

eCFR graphic er17jn94.009.gif

(c) For a test to be recognized as valid, the parameter f shall be between the limits as shown below:

eCFR graphic er17jn94.010.gif

[59 FR 31335, June 17, 1994. Redesignated at 63 FR 56995, Oct. 23, 1998]


Tried the LawStack mobile app?

Join thousands and try LawStack mobile for FREE today.

  • Carry the law offline, wherever you go.
  • Download CFR, USC, rules, and state law to your mobile device.