Found this quite interesting from a few years ago notice how most of the performance pipes would all be over the 100db.
http://www.trailandenduro.com.au/2004/rules/noise.html
LOL thats funny that you work there Dammad1!! I met the guys at the hospitality show. I was thinking that its a good idea for the event guys to know about.
At a recent MNZ meeting I attended they said in general a pipe from a European manufacturer will pass the sound test as they are mostly built with FIM competition in mind but pipes out of the USA wont
MNZ have been and will be doing sound testing of their own before the National season starts and there will be sound testing at all National rounds
i wasnt directly only blaming 4 strokes. just having a dig at the end.
allthough mostly it is the 4 strokes that annoy surrounding neighbours by their carrying lower frequency sound, some 2 strokes are also too loud. keep your muffler fresh helps.
or in the case of the guy we saw on saturday, having bolts holding your baffle in also helps.
(brake caliper bolts are also useful cheese)
If the sound under investigation is more than 10dB above the background level, there is no contamination of the source sound level.
If you have one bike putting out 90dBA and you put another bike next to it putting out 90dBA, the resulting noise level will be 93dBA.
A doubling of the loudness (perceived by the average human ear) is 10dB.
There is a British Standard mentioned in the Traffic Reg's which stipulates the criteria and methods of assessment.
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