Document ID: chunk:federal_register_of_legislation:F2021C01210:reg:90:p2
Version: federal_register_of_legislation:F2021C01210
Segment Type: reg
Provision Reference: reg 90 (pt 2/7)
Character Range: 71321–74048

will be carried out ranging between the maximum rated speed and the minimum rated speed. The extreme points of measurement shall be situated at the limits of the interval defined above and one point of measurement will coincide with the speed at which the engine develops its maximum power and the speed at which it develops maximum torque.

  3.   TEST CONDITIONS
3.1  Vehicle or engine
        3.1.l  The engine or the vehicle shall be submitted in good mechanical condition. The engine shall have been run in.
        3.1.2 The engine shall be tested with the equipment prescribed in annex 1 to this Regulation.
        3.1.3 The settings of the engine shall be those prescribed by the manufacturer and shown in annex 1 to this Regulation.
        3.1.4 In the case of a test on an engine the power of the engine shall be measured in accordance with annex 10 to this Regulation, but the tolerances of paragraph 3.1.5 of this annex shall apply. In the case of a test on a vehicle it should be established that the fuel flow is not less than that declared by the manufacturer.
        3.1.5 The power of the engine measured at the test bench during the test at steady speeds of the full load curve may differ from the power specified by the manufacturer as follows:
Maximum Power  + 2 per cent
at the other measurement  + 6 per cent
                         points  - 2 per cent.
        3.1.6 The exhaust device shall not have any orifice through which the gases emitted by the engine might be diluted. In cases where an engine has several exhaust outlets, these shall be connected to a single outlet in which the opacity measurement shall be made.
        3.1.7 The engine shall be in the normal working condition prescribed by the manufacturer. In particular, the cooling water and the oil shall each be at the normal temperature prescribed by the manufacturer.
3.2  Fuel
        The fuel shall be the reference fuel whose specifications are given in annex 6 to this Regulation.
3.3  Test laboratory
        3.3.1 The absolute temperature T of the air l/ at the inlet to the engine measured within 0.15 m upstream, of the point of entry to the air cleaner, or if no air cleaner is used, within 0.15 m of the air inlet horn, expressed in degrees Kelvin, and the atmospheric pressure ps, expressed in Kilopascals, shall be measured, and the atmospheric factor fa shall be determined according to paragraph 6.4.2.1 of annex 10 to this Regulation which corresponds to the following  provisions:
        3.3.1.1 Naturally-aspirated and mechanically-supercharged engines:
  fa =
        3.3.1.2 Turbo-supercharged engine with or without cooling of inlet air:
fa =
        3.3.2 For a test to be recognized as valid, the parameter