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Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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Old 10-31-2012, 09:31 PM   #1 (permalink)
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Muffler Repack (Emgo Shorty Reverse Cone)

So, a couple full days and 300+ miles on the new Emgos...

DAMN those things are loud! Harleys cry in envy.

A re-pack is definitely in order. Trouble is, while I've done all kinds of mods to make pipes louder- I've never tried to make one quieter (yeah, I'm that guy).

The catch is, I don't want to change the tone of the exhaust note any more than I have to. The Emgos have a rather unique sound to them. At full song they kind of put me in mind of an aircraft exhaust... the same almost snarling note the old prop fighters had. If I can keep that, I'll be a happy biker.

I'm thinking a thin wrap of steel wool and a thick layer of fiberglass is the ticket. The question is - do I pack the fiberglass in tight, and use a ton of it, or try to keep it loosely packed. Fluffy, for lack of a better word.

Is there an acoustical engineer in the house?

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Old 11-01-2012, 05:47 AM   #2 (permalink)
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emgos repack

Merlyn; I'm no acoustical engineer, but I have repacked those reverse cone short emgos several times. I liked the tone of them, but they were just too loud. The fiberglass packing that comes in them is a yellow low density fiberglass that will burn out fairly quickly especially at highway speeds. Even though ear plugs helped lower the din, after about an hour on the highway, my ears roared or rang for about half the rest of the day! So, I tried repacking "tightly" with the same type of fiberglass. The tight pack forced the exhaust thru the perforated plate that sits in the center of the exhaust tube.....basically no change in ear pain, and the snarling exhaust note seemed a little higher.

Then I bought some FMF exhaust mat for dirt bikes, which is a white tightly woven fiberglass mat, much different than the yellow stuff previously tried, and I packed it as tight as I could get it. Sounded just like the tight pack with the yellow stuff.

Finally, I wrapped the FMF glass in a loosly packed arrangement that did not compress the fibers much, but filled the megaphone, and I drilled a 3/8" hole in the center of the perforated baffle. It kept the original tone that I liked, and it did lessen the noise, but eventually I gave up and sold them to a buddy who had a 72 T120 Bonnie. I ponyed up for a set of Epco reverse cones, and those have been perfect. Good luck, tturbo2
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Old 11-01-2012, 06:04 AM   #3 (permalink)
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EPCO's

I have to second Tommy's recommendation on the EPCO's. Undeniably the best exhaust tone on a motorcycle I have ever heard with my TBS. They are not cheap and I went through some hassle with my purchase because the company was still in somewhat of a transition status due to being sold, but well worth the trouble.


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Old 11-01-2012, 06:53 AM   #4 (permalink)
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I repacked some silencers a few years ago with steel wool and found that it didn't last long. I then repacked it with stainless steel pan scourers, sounds odd but worked very well and they lasted well.
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Old 11-01-2012, 01:22 PM   #5 (permalink)
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Yep, in the US those are called Chore Boy, available in most grocery stores.

I have used those in mufflers and they do last pretty good.
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Old 11-01-2012, 04:38 PM   #6 (permalink)
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Quote:
Originally Posted by jaguartvr View Post
I repacked some silencers a few years ago with steel wool and found that it didn't last long. I then repacked it with stainless steel pan scourers, sounds odd but worked very well and they lasted well.
Quote:
Originally Posted by denny View Post
Yep, in the US those are called Chore Boy, available in most grocery stores.

I have used those in mufflers and they do last pretty good.
Thanks Guys,

I need to do something with my Scrambler baffles. I believe my neighbors are starting to develop the same mob mentality as the villagers in the Frankenstein movie......
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Old 11-01-2012, 04:40 PM   #7 (permalink)
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Quote:
Originally Posted by jaguartvr View Post
I repacked some silencers a few years ago with steel wool and found that it didn't last long. I then repacked it with stainless steel pan scourers, sounds odd but worked very well and they lasted well.
Quote:
Originally Posted by denny View Post
Yep, in the US those are called Chore Boy, available in most grocery stores.

I have used those in mufflers and they do last pretty good.
Thanks Guys,

I need to do something with my Scrambler baffles. I believe my neighbors are starting to develop the same mob mentality as the villagers in the Frankenstein movie......

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Old 11-04-2012, 02:40 PM   #8 (permalink)
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Currently have EMGO reverse cones on my TBS. I repacked them with the dirt bike matting (when they were still on my Bonnie), didn't seem to quieten them down much. Added those metal baffles to the ends, (Something like
http://www.ebay.co.uk/itm/UNIVERSAL-...item4603d1211f ), still loud.

One day I'll buy proper cans. For now I'll probably stick with alternating between the too-quiet OE exhaust and the too-loud EMGOs.
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Old 11-11-2012, 11:14 AM   #9 (permalink)
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Hello TB lovers,
as you see, this is my first post in here, but better later than ever!
Been reading here couple of years now, got lot of help and ideas, so it's time give some back.

I got my megaphones (not sure, looks same but maby the other brand 'megaton') when i buy my bike two years ago, never drive with those, awful loud sound, nothing inside the pipes.
Since my stock peashooters are almost 16 years old and not so good shape inside anymore, i got the idea (from here and Ducati forum) to do something that loud sound.

Here are some pictures what i use to repack those. The sound is now nice, not too loud, mayby little bit 'sporty' to the classic looking bike. Couldn't go to test ride, hope i could before the 'real' winter comes (it's near here).

http://imageshack.us/g/1/9857502/

Idea to use the 'kitchen sink', i stole here

http://www.ducati.ms/forums/77-sport...-reloaded.html

It's a first time when i see something is cheaper here in Finland, i only pay6 for this Emgos 1-3/4x8'' pipe silencer (i check the price, now it is 7, soon, of course, it's more expensive than Pete's link)

http://www.ebay.co.uk/itm/UNIVERSAL-...item4603d1211f
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Old 11-13-2012, 04:56 PM   #10 (permalink)
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Here is the link to short 'soundcheck',if someone is interesting.

https://vimeo.com/53359587

Sorry about newbie question, is it possible to edit you message, or embed video here?

Edit.
Okey, i have the edit button now, didn't see it yesterday??
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Last edited by Blackbird; 11-14-2012 at 02:02 PM.
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