According to the owner of the company that sells silent sport (the packing i used this weekend in hopes of quieting them)this is what i should do to make them considerably quieter. heres the email reply.....
Quote:
I can see where the problem is. Essentially, you do not have much baffle to work with as they have it designed. The "gills" you are refering to are called louvers. This is a very cheap common baffle type for many aftermarket companies. They do not attenuate sound well at all. And obviously not being "louvered" along the entire length of the "core" saves them money. If the baffle does not have either louvers or holes along it's entire circumferance and length, it cannot act as an efficent sound suppessor.
But it can be fixed. To quiet the system down, and not affect power, you simply need to drill holes in the part of the baffle that is now solid. So basically along the entire length of the baffle. It will take you some time, but it should be worth the effort. If you drill something like .125 holes (1/8th inch) in a .188 (3/16") stagger, all around the circumferance of the allow much more of the sound waves to disapate into the packing material and the Silent Sport can act as it is designed. How long is the entire core as pictured? Not just the louvered portion; the entire length.
Another option may be for you to have the solid part cut off, and simply weld on a length of perforated core material to it. You can then pack the entire length of the core and it should make a huge difference in sound. I don't know what diameter the tube is from your drawing, but I would think that 1.75" perforated core would work very well for your Triumph.
he knew what the baffle was like because i sent him the photoshop pic below. I also mentioned there were "gills" which he said are called "louvers" on the black plain pipe section that are not all along it but jusdt in the mid section.
What do you think of his recommendation ? As far as i can tell he's saying to drill holes in the pipe from the spacer where the perforated baffle starts all the way to where it comes to the header union and fill the entire length between tha inner pipe and outer wall with packing just like the rear baffle part is. But what he said is sorta confusing, tho i won't go into why for the sake of space. but read it ans see what you think he meant and whether you think it would be worthwhile. I'm a bit leary about drilling holes all along it.
