SV650.org - SV650 & Gladius 650 Forum



Bikes - Talk & Issues Newsworthy and topical general biking and bike related issues. No crapola!
Need Help: Try Searching before posting

Reply
 
Thread Tools
Old 01-06-09, 08:39 PM   #1
svtomo
Guest
 
Posts: n/a
Default how loud is 105db?

hi,
just been looking at doing my 1st trackday and noticed that there is a 105 db noise limit, just wondered if anyone could try and spell out how load that is in the real world.
i have a 350mm delkevic exhaust on my bike and its fairly load, used to have a fuel exhaust on it, iv noticed there is a few people on here with them on and wondered if they have eve been tested as i think that was louder than it is now.
any help/advice muchly apprieciated,
cheers
  Reply With Quote
Old 01-06-09, 08:49 PM   #2
Alpinestarhero
Guest
 
Posts: n/a
Default Re: how loud is 105db?

its

this loud

which is not as loud as pete and lissa's old SV, which had a stubbied exhuast which was

this loud

Generally though, a slip-on ehaust is often no more than 105 db. SV's are generally quiet bikes; my SV with its fuel end can on is not as loud as say a GSXR with a loud end-can.
  Reply With Quote
Old 01-06-09, 09:40 PM   #3
FG1
Guest
 
Posts: n/a
Default Re: how loud is 105db?

Mine measured 99 db at 4500 rpm with a stubby Fuel without baffle at Snetterton. That was a nice deep tone so I should imagine you will be OK, especially if you have one of those baffle thingies that I have heard of.....
  Reply With Quote
Old 01-06-09, 09:47 PM   #4
flymo
Member
Mega Poster
 
flymo's Avatar
 
Join Date: Jan 2008
Location: North West
Posts: 3,124
Default Re: how loud is 105db?

its very difficult to tell by ear just how loud a bike is, sounds daft but true.

I've heard loud race bikes that register pretty low with a sound meter. Its the type of sound, not just the perceived volume. A raspy 2 stroke 125 will register much higher than your average 4 stroke screamer.

The other thing is that the sound meter test should be done at a specific rev limit based on the bore and stroke and type of motor. Your bike might be very quiet at the test revs and loud as hell higher up.

Only way to test for sure is with a meter.
flymo is offline   Reply With Quote
Old 01-06-09, 10:38 PM   #5
pencil shavings
Guest
 
Posts: n/a
Default Re: how loud is 105db?

my bike with a straight through two brothers racing can is super quite below 5k rpm, then comes to life, and really makes a noise after 9k rpm
  Reply With Quote
Old 02-06-09, 01:35 AM   #6
Jamiebridges123
Guest
 
Posts: n/a
Default Re: how loud is 105db?

C&P'd from some forum I found on google.

Quote:
* Near total silence - 0 dB
* A whisper - 15 dB
* Normal conversation - 60 dB
* A lawnmower - 90 dB
* A car horn - 110 dB
* A rock concert or a jet engine - 120 dB
* A gunshot or firecracker - 140 dB
  Reply With Quote
Old 02-06-09, 06:05 AM   #7
ThEGr33k
Guest
 
Posts: n/a
Default Re: how loud is 105db?

Remember that for every 3dB increase the noise gets twice as loud.

Quote:
Originally Posted by pencil shavings View Post
my bike with a straight through two brothers racing can is super quite below 5k rpm, then comes to life, and really makes a noise after 9k rpm

So surly it dont make noise too often?

Last edited by ThEGr33k; 02-06-09 at 06:08 AM.
  Reply With Quote
Old 02-06-09, 09:52 AM   #8
pencil shavings
Guest
 
Posts: n/a
Default Re: how loud is 105db?

Quote:
Originally Posted by ThEGr33k View Post
Remember that for every 3dB increase the noise gets twice as loud.




So surly it dont make noise too often?
the first bit - I did not know that

and no, it dosent make noise too often, unless Im going to a proper ride, it works out well I think, quite in town when you dont really want to attract attention, then lets everyone know you are coming when you push!
  Reply With Quote
Old 02-06-09, 10:05 AM   #9
ThEGr33k
Guest
 
Posts: n/a
Default Re: how loud is 105db?

From onboard mine seems loudest at 3K... which is about the RPM I ride at in town, well between 2.5K and 3K most of the time. Woops. As to weather it is actually the loudest from off the bike. Im not too sure, would guess not.
  Reply With Quote
Old 02-06-09, 10:11 AM   #10
Mr Speirs
Member
Mega Poster
 
Mr Speirs's Avatar
 
Join Date: Jul 2008
Location: Northampton
Posts: 2,218
Default Re: how loud is 105db?

Yup every 3db is a doubling of volume but only electronically measured with no weighting.

For a percieved doubling in volume a 6-10db increase would be required. This is because the human ear automatically attenuates low frequencies. So V-Twin are generally much quieter to the ear than a screaming IL4.

Ever noticed how you hear a V-Twin rev and you smile where as an IL4 you wince???
__________________
Smokey Black Burnty 02 - Racetech Smoulderlators + .90kg BBQ Springs, zx10r shockingly toasted, Conti Road Attacks heat up very nicely, R&G Crash Bungs but what f**king use are they, No Colour Matched Hugger, Flame Extenda, Beowulf Titainium Oval Flame Thrower.
Mr Speirs is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Darley Moor Saturday 11th July (105db) G Track Days 0 22-05-09 08:36 PM
How loud will it be??? Drew Carey Exhausts 32 22-07-08 07:32 AM
How loud is loud? yorkie_chris SV Talk, Tuning & Tweaking 28 29-12-07 09:01 AM
How F***ing Loud!!!! Jimmy2Feet SV Talk, Tuning & Tweaking 64 15-08-06 04:41 PM
wow - thats LOUD !!!! Silver Dream SV Talk, Tuning & Tweaking 4 01-01-05 08:14 PM


All times are GMT. The time now is 10:35 PM.


Powered by vBulletin® - Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.