Is there a "proper" way to test sound/decibel levels?



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Thread: Is there a "proper" way to test sound/decibel levels?

  1. #1
    kiwi's Avatar
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    Is there a "proper" way to test sound/decibel levels?

    So I see many organisations have sound limits. In the US it seems to be around 96db and here in Ontario most are 94db. Some MX tracks are 99db. I was wondering if there was a std method of testing for sound levels? I haven't see anything describing *how* the sound tests are to be carried out. Ie. Throttle at 50%, measuring device 2 foot away at 45deg angle etc etc.

    Does anyone know if there's a accepted way to test?
    -blah blah blah

  2. #2

    Re: Is there a "proper" way to test sound/decibel levels?

    https://www.oftr.ca/riding-etiquette-expectations.php

    94dbA is a limit established and tested under SAE J1287. Simply put the bike is tested at 0.5 m from the exhaust at a 45 degree angle. The bike is to be tested in neutral at an rpm of half of its maximum rated rpm (redline).

  3. #3

    Re: Is there a "proper" way to test sound/decibel levels?

    At CMA events we observe FIM standard but rarely need to even monitor sound as 99% of the trials bikes are using the factory approved exhaust modifications. Trials bikes are pretty quiet unless somebody is crashing with the throttle stuck wide open.

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    Re: Is there a "proper" way to test sound/decibel levels?

    Where I have seen the test procedure defined, they have been based on J1287 (offroad) or J2825 (on-road). Most vary slightly from the official SAE process (I'm not sure if this was intentional or accidental).

    I'm pretty sure the Calabogie noise protocol was created before J2825 so I'm not sure what the actual process is there.

  5. #5
    kiwi's Avatar
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    Re: Is there a "proper" way to test sound/decibel levels?

    thanks for the info everyone.
    -blah blah blah

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