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-   -   Making an exhaust quieter? (http://forums.sv650.org/showthread.php?t=183306)

Sy-superfly 22-08-12 08:25 PM

Making an exhaust quieter?
 
How, other than a baffle, do you make an exhaust quieter.
Story is I've got a micron system and it's 104db and it's got a cannon on it (big can) and don't really have a clue why a m4 exhaust is only 98db so I know it's possible. Any help would be good.

unclepoo 22-08-12 09:21 PM

Re: making an exhaust quieter.
 
I would thing a larger silencer is better than a small one if the internals are the same..ie, the perforated tube and the sound deadening material. I cut open a cheep silencer and found the perforated tube surrounded by about 1/2inch of wire wool, outside that was the white sound deadening material. The silencer body was about 500mm long but was hopeless at reducing noise, yet a similar sized silencer I got from Motad (one of there experimental units) was almost as quiet as a stock system but was straight through unit. Both silencers were fitted to my to my mx5 that gets driven hard and revs to about 7500rpm and neither had a performance advantage.

monkey 23-08-12 12:40 AM

Re: making an exhaust quieter.
 
It might need re-packing. Do you know how many miles it's done?

drewby89 23-08-12 07:18 PM

Re: Making an exhaust quieter?
 
If it's done a lot of miles the wadding which is sandwiched between the inner perforated tubes and the outer casing of the can has probably gone dry / hard and is no longer having the silencing effect it should.

I've no experience in re-packing a silencer but it may be worth looking into as suggested by monkey

Sy-superfly 25-08-12 06:25 PM

Re: Making an exhaust quieter?
 
Will give the repackaging a wirl as the end opens with Allen keys easily and get back to you with the outcome.

Penry 25-08-12 08:57 PM

Re: Making an exhaust quieter?
 
Repacking !

speedyandypandy 25-08-12 10:52 PM

Re: Making an exhaust quieter?
 
Last time I was without a baffle the guy at soundtest just laughed at me, 107 db, strict fellas down at Pembrey, baffle in 101db, maybe a repack is in order for me to.


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