Document ID: chunk:federal_register_of_legislation:F2021C00509:reg:6:p14
Version: federal_register_of_legislation:F2021C00509
Segment Type: reg
Provision Reference: reg 6 (pt 14/15)
Character Range: 195791–199059

hydrobromic acid (HBr) 10 ml
          1 N sulphuric acid (H2SO4) 10ml
          Distilled water to make up to l,000 ml

          Note: The material must be washed in distilled water and dried for one hour at 105 degrees C before weighing.

          5.1.4.                                   Before the system is tested in accordance with paragraph 3.1., it must be put into a normal state for road use by one of the following methods :

          5.1.4.1.                             Conditioning by continuous road operation .

          5.1.4.1.1.                       The minimum distance to be completed during conditioning shall be 2,000 km.

          5.1.4.1.2.                       50% +/- 10% of this conditioning cycle shall consist of town driving and the remainder of long-distance runs; the continuous road cycle may be replaced by a corresponding test-track programme.

          5.1.4.1.3.                       The two speed regimes must be alternated at least six times.

          5.1.4.1.4.                       The complete test programme must include a minimum of 10 breaks of at least three hours' duration in order to reproduce the effects of cooling and condensation.

          5.1.4.2.                             Conditioning by pulsation .

          5.1.4.2.1.                       The exhaust system or components thereof must be fitted to the moped or to the engine. In the former case, the moped must be mounted on a roller dynamometer. In the second case, the engine must be mounted on a test bench.
          The test apparatus, a detailed diagram of which is shown in figure 3, shall be fitted at the outlet of the exhaust system. Any other apparatus providing equivalent results shall be acceptable.

          5.1.4.2.2.                       The test equipment must be adjusted so that the flow of exhaust gases is alternately interrupted and restored 2,500 times by a rapid-action valve.

          5.1.4.2.3.                       The valve must open when the exhaust gas back-pressure, measured at least 100 mm downstream of the intake flange, reaches a value of between 0.35 and 0.40 bar. Should such a figure be unattainable because of the engine characteristics, the valve must open when the gas back-pressure reaches a level equivalent to 90% of the maximum that can be measured before the engine stops. It must close when this pressure does not differ by more than 10% from its stabilized value with the valve open.

          5.1.4.2.4.                       The time-delay switch must be set for the duration of exhaust gases calculated on the basis of the requirements of paragraph 5.1.4.2.3. above .

          5.1.4.2.5.                       Engine speed must be 75% of the speed (S) at which the engine develops maximum power .

          5.1.4.2.6.                       The power indicated by the dynamometer must be 50% of the full-throttle power measured at 75% of engine speed (S) .

          5.1.4.2.7.                       Any drainage holes must be closed off during the test.

          5.1.4.2.8.                       The entire test must be completed within 48 hours. If necessary, a cooling period must be allowed after each hour.

          5.1.4.3.                             Conditioning on