5.

PROCEDURE FOR BENCH TESTS 5.1. Special conditions for carrying out the cycle 5.1.1. The temperature in the place where the roller bench is situated shall be between 20º and 30º C throughout the test and approximate as closely as possible that of the place where the vehicle was conditioned for the test. 5.1.2. The vehicle shall be more or less horizontal during the test so as to avoid any abnormal distribution of the fuel. 5.1.3. The test shall be carried out with the bonnet raised. An auxiliary ventilating device acting on the radiator (water-cooled) or on the air intake (air-cooled) may be used, if necessary, to keep the engine temperature normal. 5.1.4. When the cycle is carried out the speed considered shall be that of the rollers connected to the brake flywheel. During the test the speed shall be plotted against time so that the correctness of the cycles performed can be assessed. 5.1.5. Recording of the vacuum shall be optional ; however, if it is recorded at the same time as the speed, it will be possible to judge whether the accelerations have been made correctly. 5.1.6. The temperatures of the cooling water and of the crankcase oil may also be recorded if desired. 5.2. Starting up the engine 5.2.1. The engine shall be started up by means of the devices provided for this purpose, such as the choke, the starter valve, etc., according to the manufacturer's instructions. 5.2.2. The engine shall be kept idling on the choke for a period of forty seconds. The first cycle shall begin when the valve of the effluent-recovery device is operated, which shall be done at the end of the forty-second period. 5.3. Use of the manual choke The choke shall be cut out as soon as possible, and in principle before acceleration from 0 to 50 km/h. If this requirement cannot be met, the moment of effective cut-out shall be indicated. The method used to adjust the choke shall be that indicated by the manufacturer. 5.4. Idling 5.4.1. Manual-shift gearbox: 5.4.1.1. During periods of idling the clutch shall be engaged and the gears in neutral. 5.4.1.2. To enable the accelerations to be performed according to the normal cycle the vehicle shall be put in first gear, with the clutch disengaged, five seconds before the acceleration following the idling period in question. 5.4.1.3. The first idling period at the beginning of the cycle shall consist of six seconds of idling in neutral with the clutch engaged and five seconds in first gear with the clutch disengaged. 5.4.1.4. For the idling periods during each cycle the corresponding times shall be sixteen seconds in neutral and five seconds in first gear with the clutch disengaged. 5.4.1.5. The last idling period in the cycle shall consist of seven seconds in neutral with the clutch engaged. 5.4.2. Semi-automatic gearboxes: The manufacturer's instructions for driving in town, or in their absence instructions applicable to manual gearboxes, shall be followed. 5.4.3. Automatic gearboxes: The selector must not be operated at any time during the test unless the manufacturer specifies otherwise. In the latter case the procedure for manual gearboxes shall be applied. 5.5. Accelerations 5.5.1. Accelerations shall be so performed that the rate of acceleration is as constant as possible through-out the operation. 5.5.2. If acceleration cannot be carried out in the prescribed time, the extra time required shall be deducted from the time allowed for changing the combination, if possible, and in any case from the next steady-speed period. 5.6. Decelerations 5.6.1. All decelerations shall be effected by removing the foot completely from the accelerator, the clutch remaining engaged. The clutch shall be disengaged, without touching the gear lever, at a speed of 10 km/h. 5.6.2. If the period of deceleration is longer than that prescribed for the corresponding phase, the vehicle's brakes shall be used to keep to the cycle. 5.6.3. If the period of deceleration is shorter than that prescribed for the corresponding phase, the timing of the theoretical cycle shall be restored by an idling period merging into the following idling operation. 5.6.4. At the end of the deceleration period (stopping vehicle on the rollers) the gear shall be put into neutral and the clutch engaged. 5.7. Steady speeds 5.7.1. "Pumping" or the closing of the throttle shall be avoided when passing from acceleration to the following steady speed. 5.7.2. Periods of constant speed shall be achieved by keeping the accelerator position fixed.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.