Muffler autopsy
Cruiser
Joined: Feb 2007
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RE: Muffler autopsy
Wellafter taking my ear shattering Samsons off I went back with the stock exhaust but that for me was "too quiet" and I lost 5mpg.
I simply drilled a 7/16 hole right in the middle of what looks like a freeze plugthat anengine block would have on each muffler.
I really like the sound + gained 2mpg back.
So many people with so many ideas of what a bike should sound like, only you can decide.
I simply drilled a 7/16 hole right in the middle of what looks like a freeze plugthat anengine block would have on each muffler.
I really like the sound + gained 2mpg back.
So many people with so many ideas of what a bike should sound like, only you can decide.
Elite HDF Member
Joined: Apr 2008
Posts: 4,718
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From: Back in the Good Ole USA. South Carolina to be exact.
RE: Muffler autopsy
Ok, it was raining today when I got home. I was bored. So........ I pulled the mufflers off my fat bob, carefully drilled the rivets out of one, and knocked the baffle out. Fascinating, What I found is a fiberglass bat lining the inside ofthe outer chrome tube. The baffle is a double walled steel tube with a plug welded in about two thirds of the way in from the exit end of the tube. The inner wall of the tube has rows of holes on each side of the plug. The outer wall has many many fine holes, almost like a mesh. I suppose this serves to protect and keep the fiberglass batting in place. To make a long story short, I replaced the baffle and installed new pop rivets. However While I had the mufflers off I used a 1.25 inch hole saw w/a drill extension and cut the plugs out, effectively creating a pair of straight thru glas pack mufflers. They sound pretty good in my garage, still raining so I can't really road test em. I took a few pics if any one is interested. I inspected the pipes while the mufflers were off, they are just plain two into one into two. No cat.
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Tourer
Joined: May 2007
Posts: 344
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RE: Muffler autopsy
ORIGINAL: cornishman
I,m sure i could make something up.I,m not sure if your baffles are the same internal diamentionsso to be sure i would need a baffle to work,if that sounds ok let me know and i,ll sort it.
ORIGINAL: Limey
Hi Cornishman, thanks for that, it looks pretty simple and very neat. In fact given how small they are I'm amazed they actually affect the sound at all. I don't suppose you'd fancy creating another pair would you? As somebody who's never welded in my life I'd happily pay for them.
ORIGINAL: cornishman
Hi Limey, i,m in the UK as well.I have Shortshots with"quiet" baffles and found them a little too loud for the same reasons as you.
I havemoddified them by the same principle as you see on aftermarket cans ie a removable baffle that sits inside the "quiet" baffle.
Dead easy to make and takes that top edge off the sound (the raspy bit) i,m real pleased with the mod.
The performance feels at least the same,the tone maybe slightly deeper,i,ll let you know the dyno figures soon.
I,ve seen this used on other pipesin fact the pipe i used came from a BMW R1150R Remus muffler.
The pipe is 1 1/4" outside diameter, 2 1/2" long, with a bracket welded to the end with a 1/4" unc hole tapped in ittofasten inside the V&Hquiet baffle. The maximum length you could go to is 5" which could drop the sound more i,m not sure.
I drilled a clearance hole in the V&H baffle opposite to the existing hole with the backing nut as this makes any removal easier in the future.
I used the original V&H stainless fixing screws.
[IMG]local://upfiles/32129/569FF6791BD045E398E5D9EBF70F79CB.jpg[/IMG]
[IMG]local://upfiles/32129/4C9FE6D96256465290861017DD5AF2E7.jpg[/IMG]
ORIGINAL: Limey
Used stock mufflers are cheaper. I have V&H slipons at the moment and even with the "quiet" baffles in they're very loud and I will get a ticket for it here in the UK if I'm caught. I was hoping that modified stock mufflers would be less anti-social and will definitely stop me getting a ticket.
ORIGINAL: RAWHIDE07
I advise against the mod.Used slip-ons are cheap and can be resold,if you buy a set and don't like them you can return to stock.Modified stock mufflers would be hard to sell.
I advise against the mod.Used slip-ons are cheap and can be resold,if you buy a set and don't like them you can return to stock.Modified stock mufflers would be hard to sell.
I havemoddified them by the same principle as you see on aftermarket cans ie a removable baffle that sits inside the "quiet" baffle.
Dead easy to make and takes that top edge off the sound (the raspy bit) i,m real pleased with the mod.
The performance feels at least the same,the tone maybe slightly deeper,i,ll let you know the dyno figures soon.
I,ve seen this used on other pipesin fact the pipe i used came from a BMW R1150R Remus muffler.
The pipe is 1 1/4" outside diameter, 2 1/2" long, with a bracket welded to the end with a 1/4" unc hole tapped in ittofasten inside the V&Hquiet baffle. The maximum length you could go to is 5" which could drop the sound more i,m not sure.
I drilled a clearance hole in the V&H baffle opposite to the existing hole with the backing nut as this makes any removal easier in the future.
I used the original V&H stainless fixing screws.
[IMG]local://upfiles/32129/569FF6791BD045E398E5D9EBF70F79CB.jpg[/IMG]
[IMG]local://upfiles/32129/4C9FE6D96256465290861017DD5AF2E7.jpg[/IMG]
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