(a) General requirements. (1) Ambient temperature levels encountered by the test engine throughout the test sequence may not be less than 20 C nor more than 30 C.
(1) Ambient temperature levels encountered by the test engine throughout the test sequence may not be less than 20 C nor more than 30 C.
(2) Calculate all volumes and volumetric flow rates at standard conditions for temperature and pressure. Use these conditions consistently throughout all calculations. Standard conditions for temperature and pressure are 25 C and 101.3 kPa.
(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 ps and expressed in kPa. Determine the parameter f according to the following provisions:
(1) Naturally aspirated and mechanically supercharged engines:
[GRAPHIC(S) NOT AVAILABLE IN TIFF FORMAT]
(2) Turbocharged engine with or without cooling of inlet air:
[GRAPHIC(S) NOT AVAILABLE IN TIFF FORMAT]
(3) For a test to be recognized as valid, the parameter f must be between the limits as shown below: [GRAPHIC(S) NOT AVAILABLE IN TIFF FORMAT]