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General Category >> Rubber Side Down! >> Anatomy of a sportster muffler
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Message started by diamond jim on 04/20/09 at 05:10:30

Title: Anatomy of a sportster muffler
Post by diamond jim on 04/20/09 at 05:10:30

For those who might want to know.

http://i255.photobucket.com/albums/hh128/russ_diamond_jim/sporsteranatomy.jpg
http://i255.photobucket.com/albums/hh128/russ_diamond_jim/S4021930.jpg

Title: Re: Anatomy of a sportster muffler
Post by JohnBoy on 04/20/09 at 05:35:39

Is that the anatomy of a Sportster muffler, or the anatomy of half of a Sportster muffler?

Title: Re: Anatomy of a sportster muffler
Post by diamond jim on 04/20/09 at 05:37:04

Ha ha. The cut was made at the point where the rear taper starts.

Title: Re: Anatomy of a sportster muffler
Post by matt_savage on 04/20/09 at 06:25:12

That's interesting. I have 2 sportster muffler's that I won on Ebay a few weeks back. I'm going to mount one on mine to a little better sound. I also noticed that the ones I have (from a 1200) both are completely blocked with the baffle? Is that normal? I went ahead and drilled a 1/2" hole in the middle to hopefully get a better flow and sound through it.

-Matt

Title: Re: Anatomy of a sportster muffler
Post by diamond jim on 04/20/09 at 06:51:33

383421210A263423343230550 wrote:

... I also noticed that the ones I have (from a 1200) both are completely blocked with the baffle? Is that normal? I went ahead and drilled a 1/2" hole in the middle to hopefully get a better flow and sound through it.
-Matt

Yep, that blockage you are referring to is what I indicated in the first pic as the "middle plate".

Title: Re: Anatomy of a sportster muffler
Post by matt on 04/20/09 at 10:04:51

IS that white insulation stuff ( kinda looks like fiber glass material, first pic item at bottom ) important??

Reason i ask is that i have a supertrap on mine, it was making a rattle that drove me nuts! i decided to investigate so i took out the baffle and that insulation stuff was like barley there...

Some of the material got so hot (im assuming here) small peices hardened and were rattling around in there like a bunch of small rocks. i took what little bit that was left out (about half of it) i didnt think it would be doing its job or it would at least half assed one lol.

should i replace that? what does that stuff do anyway?

Title: Re: Anatomy of a sportster muffler
Post by serowbot on 04/20/09 at 10:20:42

Very interesting,... thanks DJ.....
Gonna' do some studyin' and thinkin'.....

Title: Re: Anatomy of a sportster muffler
Post by diamond jim on 04/20/09 at 10:24:29

I've seen my share up muffler packing and I was quite impressed with the sportster's setup. That is probably the most dense packing I've seen in a muffler. It's wrapped on itself almost 3 times around so only a small section of it is actually exposed. Plus, I can see by the quality of the fiberglass used and by the design of the retainer tube that a bike will wear out before this packing does.

Title: Re: Anatomy of a sportster muffler
Post by youzguyz on 04/20/09 at 10:47:58

3538303C3E3F353B383C510 wrote:

Maybe the packing will last forever, but that baffle doesn't! Blew mine out around.. hmm.. 25k miles? Fortunately, the mufflers are free at the HD place if you schmooze nicely with them and ask em to save some takeoffs for you.