Document ID: chunk:federal_register_of_legislation:F2021C01210:reg:5:p1
Version: federal_register_of_legislation:F2021C01210
Segment Type: reg
Provision Reference: reg 5 (pt 1/5)
Character Range: 112470–115323

5  Anti-pollution devices

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        */ Exhaust gas recirculation.
5.3  Test conditions
        5.3.1 The net power test shall consist of a run at full throttle for positive-ignition engines and at fixed full-load fuel injection pump setting for diesel engines, the engine being equipped as specified in table 1.
        5.3.2 Performance data shall be obtained under stabilizing operating conditions with an adequate fresh air supply to the engine. The engines must have been run-in in accordance with the manufacturer's recommendations. Combustion chambers may contain deposits, but in limited quantity. Test conditions, such as inlet air temperature, shall be selected as near to reference conditions (see 6.2) as possible in order to minimize the magnitude of the correction factor.
        5.3.3 The temperature of the inlet air to the engine (ambient air) shall be 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. The thermometer or thermocouple shall be shielded from radiant heat and placed directly in the air stream. It shall also be shielded from fuel sprayback. A sufficient number of locations shall be used to give a representative average inlet temperature.
        5.3.4 No data shall be taken until torque, speed and temperatures have been maintained substantially constant for at least 1 min.
        5.3.5 The engine speed during a run or reading shall not deviate from the selected speed by more than + 1 per cent or + 10 min-l  whichever is greater.
        5.3.6 Observed brake load, fuel consumption and inlet air temperature data shall be taken simultaneously and shall be the average of two stabilized consecutive values which do not vary more than 2 per cent for the brake load and fuel consumption.
        5.3.7 The temperature of the coolant at the outlet from the engine shall be kept within + 5 K, from the upper thermostatically-controlled temperature specified by the manufacturer. If no temperature is specified by the manufacturer, the temperature shall be 353 K + 5 K. For air-cooled engines, the temperature at a point indicated hy the manufacturer shall be kept within -20K of the maximum value specified by the manufacturer in the reference conditions.
        5.3.8 The fuel temperature shall be measured at the inlet to the carburettor or at the fuel injection system and maintained within the limits established by the engine manufacturer.
        5.3.9 The temperature of the lubricating oil measured in the oil sump or at the outlet from the oil cooler, if fitted, shall be maintained within the limits established by the engine manufacturer.
        5.3.10 An auxiliary regulating system may be used if necessary to maintain the temperatures within the limits specified in paragraphs 5.3.7., 5.3.8. and