Control of motorcycle noise, Volume 1

Front Cover
U.S. Environmental Protection Agency; available through National Technical Information Service, Springfield, Va., 1974 - Motorcycles
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Page C-4 - No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise emitted by the motor of such vehicle above that emitted by the muffler originally installed on the vehicle and such original muffler shall comply with all of the requirements of this section.
Page C-3 - Every motor vehicle subject to registration and operated on a highway shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise and no such muffler or exhaust system shall be equipped with a cut-out, by-pass, or similar device.
Page B-22 - The surface of the ground within the measurement area shall be dry concrete or asphalt, free from powdery snow, loose soil or ashes. 3.1.2 Because bystanders may have an appreciable influence on meter response when they are in the vicinity of the vehicle or the microphone, not more than one person other than the observer reading the meter shall be within 50 ft of the vehicle or microphone, and that person shall be directly behind the observer reading the meter, on a line through the microphone and...
Page B-22 - ... shall be directly behind the observer reading the meter, on a line through the microphone and the observer. 3.1.3 — The ambient sound level (including wind effects) due to sources other than the vehicle being measured shall be at least lOdbA lower than the level of the tested vehicle. 3.1.4 — The path of vehicles shall be of relatively smooth, dry concrete or asphalt, free of extraneous matter such as graveL 3.1.5 — The microphone shall be located 50 ft. from the centerline of the vehicle...
Page B-23 - ... vehicle shall use second gear. Vehicles which reach maximum rated engine speeds before reaching a point 25 ft. beyond the microphone shall be tested in third gear. 3.2.2 The vehicle shall proceed along the test path at a constant approach speed which shall correspond to either the engine speed of 60% of the speed at which the engine develops maximum horsepower or at 30 mph whichever is lower. When the front of the vehicle reaches the acceleration point, the throttle shall be opened wide, and...
Page B-22 - Driving Cycle The Council shall advocate the study of driving cycles (patterns) on motorcycles to better define the problem of motorcycle sound levels as relates to the public interest. 1 . INTRODUCTION This Standard establishes maximum sound levels for motorcycles and motor driven cycles and describes the test procedure, environment, and instrumentation for determining these sound levels. 2. INSTRUMENTATION The following instrumentation shall be used for the measurement required: 2.1 A sound level...
Page C-6 - This section applies to the total noise from a vehicle or combination of vehicles and shall not be construed as limiting or precluding the enforcement of any other provisions of this code relating to motor vehicle exhaust noise.
Page C-7 - ... (a) No person shall operate either a motor vehicle or combination of vehicles of a type subject to registration at any time or under any condition of grade, load, acceleration or deceleration in such a manner as to exceed the following noise limit for the category of motor vehicle...
Page B-9 - As an alternative to making direct measurements using a sound level meter, a microphone or sound level meter may be used with a magnetic tape recorder and/or a graphic level recorder or indicating Instrument provided that the system meets the performance requirements of ANSI Sl.41971.
Page B-12 - Operating manuals or other literature furnished by the instrument manufacturer must be referred to for both recommended operation of the instrument and precautions to be observed. The following instrumentation must be used, where applicable: (1) A sound level measurement system which meets the type...

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