Document ID: chunk:federal_register_of_legislation:F2021C01210:reg:12:p1
Version: federal_register_of_legislation:F2021C01210
Segment Type: reg
Provision Reference: reg 12 (pt 1/2)
Character Range: 107084–109894

12   Anti-pollution devices 10/                                                                 Yes, standard production equipment

  la/ The complete intake system shall be fitted as provided for the intended application:
        Where there is a risk of an appreciable effect on the engine power;
        In the case of two-stroke and positive-ignition engines;
When the manufacturer requests that this should be done.
  In other cases, an equivalent system may be used and a check should be made to ascertain that the intake pressure does not differ by more than 100 Pa from the limit specified by the manufacturer for a clean air filter.
lb/ The complete exhaust system shall be fitted as provided for the intended application:
        Where there is a risk of an appreciable effect on the engine power;
In the case of two-stroke and positive ignition engines;
When the manufacturer requests that this should be done.
  In other cases, an equivalent system may be installed provided the pressure measured at the exit of the engine exhaust system does not differ by more than 1,000 Pa from that specified by the manufacturer. The exit from the engine exhaust system is defined as a point 150 mm downstream from the termination of the part of the exhaust system mounted on the engine.
         2/  If an exhaust brake is incorporated in the engine, the throttle valve must be fixed in a fully open position.
        3/  The fuel feed pressure may be adjusted, if necessary, to reproduce the pressures existing in the particular engine application (particularly when a "fuel return" system is used).
        4/  The air intake valve is the control valve for the pneumatic governor of the injection pump. The governor of the fuel injection equipment may contain other devices which may affect the amount of injected fuel.
        5/  The radiator, the fan, the fan cowl, the water pump and the thermostat shall be located on the test bench in the same relative positions as on the vehicle. The cooling liquid circulation shall be operated by the engine water pump only.
        Cooling of the liquid may be produced either by the engine radiator or by an external circuit, provided that the pressure loss of this circuit and the pressure at the pump inlet remain substantially the same as those of the engine cooling system. The radiator shutter, if incorporated, shall be in the open position.
        Where the fan, radiator and cowl system cannot conveniently be fitted to the engine, the power absorbed by the fan when separately mounted in its correct 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,