Document ID: chunk:federal_register_of_legislation:F2021C01210:reg:12:p2
Version: federal_register_of_legislation:F2021C01210
Segment Type: reg
Provision Reference: reg 12 (pt 2/2)
Character Range: 109642–112099

position in relation to the radiator and cowl (if used), must be determined at the speeds corresponding to the engine speeds used for measurement of the engine power either by calculation from standard characteristics or by practical tests. This power, corrected to the standard atmospheric conditions defined in paragraph 6.2, should be deducted from the corrected power.
        6/  Where a disconnectable or progressive fan or blower is incorporated, the test shall be made with the disconnectable Fan (or blower) disconnected or with the progressive fan or blower running at maximum slip.
        7/ The thermostat may be fixed in the fully open position.
        8/  Minimum power of the generators the power of the generator shall be limited to that necessary for the operation of accessories which are indispensable for the operation of the engine. If the connection of a battery is necessary, a fully charged battery in good order must be used.
        9/  Charge air-cooled engines shall be tested with charge air cooling, whether liquid- or air-cooled, but if the engine manufacturer prefers, a test bench system may replace the air-cooled cooler. In either case, the measurement of power at each speed shall be made with the same pressure drop and temperature drop of the engine air across the charge air cooler on the test bench system as those specified by the manufacturer for the system on the complete vehicle.
        10/  They may include, for example, EGR */ system, catalytic convertor, thermal reactor, secondary air supply system and fuel evaporation protecting system.
5.1.3 Compression ignition engine starting auxiliaries
        For the auxiliaries used in starting compression ignition engines, the two following cases shall be considered:
             (a) Electrical starting. The generator is fitted and supplies, where necessary, the auxiliaries indispensable to the operation of the engine;
             (b) Starting other than electrical. If there are any  electrically operated accessories indispensable to the operation of the engine, the generator is fitted to supply these accessories. Otherwise, it is removed.
        In either case, the system for producing and accumulating the energy necessary for starting is fitted and operates in the unloaded condition.
        5.2.  Setting conditions
        The setting conditions for the test to determine the net power are indicated in table 2.

TABLE 2 - Setting conditions