Hand-held sound meters

**dammad1** · 1st October 2007, 18:47

Originally Posted by B0000M

isnt every 3db double the loudness? (here we go)

its fairly easy to tell when a bike is too loud, use your ears!, heres an example

bike 1 goes past, sounds normal
bike 2 goes past sounds normal
bike 3 goes past sounds normal
bike 4 goes past, sounds fucken loud.
bike 5 goes past sounds normal

result: send bike 4 packing until fixed.

(bike 4 was probably a 4 stroke)

You found the answer BOOM, ban the four strokes and problem solved! LOL!

**rijekaz** · 1st October 2007, 18:56

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

**vr4king** · 1st October 2007, 19:27

Originally Posted by B0000M

isnt every 3db double the loudness? (here we go)

its fairly easy to tell when a bike is too loud, use your ears!, heres an example

bike 1 goes past, sounds normal
bike 2 goes past sounds normal
bike 3 goes past sounds normal
bike 4 goes past, sounds fucken loud.
bike 5 goes past sounds normal

result: send bike 4 packing until fixed.

(bike 4 was probably a 4 stroke)

Or a tractor..............oh hang on same thing

**cheese** · 1st October 2007, 20:18

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.

**Kickaha** · 1st October 2007, 20:30

Originally Posted by rijekaz

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

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

**dammad1** · 1st October 2007, 20:56

Originally Posted by cheese

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.

Yeah I wasn't there as I look after a different range of products and try to leave all the handheld instruments to Anton and another couple of guys.

But if anyone does want a good one, let me know and i'll make sure you get a good price.

**takitimu** · 1st October 2007, 21:36

Originally Posted by NighthawkNZ

http://www.dse.co.nz/cgi-bin/dse.sto...uct/View/Q1362

though not for NOT RECOMMENDED FOR COMMERCIAL USE. and Accuracy: +⁄- 2.0dB

I got one of the RadioShack analogue ones dse used to sell, handy thing for setting up home theatre speakers

. I'll do some tests tomorrow, should be under 92db from memory.

As an aside the American's are going quiet eg. FMF q4

**barty5** · 2nd October 2007, 07:10

Originally Posted by B0000M

isnt every 3db double the loudness? (here we go)

its fairly easy to tell when a bike is too loud, use your ears!, heres an example

bike 1 goes past, sounds normal
bike 2 goes past sounds normal
bike 3 goes past sounds normal
bike 4 goes past, sounds fucken loud.
bike 5 goes past sounds normal

result: send bike 4 packing until fixed.

(bike 4 was probably a 4 stroke)

what you talkin about there are one hell of a lota noisey chainsaws out there not just the fours specs show mine to only be 94db

**B0000M** · 2nd October 2007, 10:23

Originally Posted by barty5

what you talkin about there are one hell of a lota noisey chainsaws out there not just the fours specs show mine to only be 94db

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)

**bungbung** · 2nd October 2007, 10:44

Originally Posted by LLAMA SOLA

100 dbSPL for a bike, but police and WOF places are just as likely to go by subjective opinion then actually test your bike.

100 when measured where? how far away? at what rpm?

**barty5** · 2nd October 2007, 11:46

Originally Posted by B0000M

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)

We all like to have at what ever you dont ride guys were givin me shit for not havin push button start and that the bike was to clean(fixed that real quick)

man cheese that sounds like it could have been a nice trip over the bars

**DrewBroadley** · 2nd October 2007, 12:13

Originally Posted by bungbung

100 when measured where? how far away? at what rpm?

Most probably right outside the exhaust and all through the rev range to get the loudest note.

**cheese** · 2nd October 2007, 12:29

Originally Posted by B0000M

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)

LOL one of my front brake caliper bolts fell out and the other was really loose. I noticed it when I lost front brakes and so I stopped and only had one vlot very loosely in!!!! Very slow trip back from there!!!!!!!!

**takitimu** · 2nd October 2007, 13:24

Originally Posted by DrewBroadley

Most probably right outside the exhaust and all through the rev range to get the loudest note.

Well, I'm 92db with the meter on the seat, jumping to 100db throttle blipped, assuming the meter is accurate at those levels.

**Deano** · 2nd October 2007, 13:35

Originally Posted by dammad1

Sound testing can be very subjective. It needs to be done in a controlled area but it never is. How can you say something is to loud when testing in an open enviroment with all sorts of background noise and etc.

If the sound under investigation is more than 10dB above the background level, there is no contamination of the source sound level.

Originally Posted by B0000M

isnt every 3db double the loudness? (here we go)

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.

Originally Posted by bungbung

100 when measured where? how far away? at what rpm?

There is a British Standard mentioned in the Traffic Reg's which stipulates the criteria and methods of assessment.