 How to make thunderbike's quieter according to....
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Joined: Jul 2005
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Learned Hand
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OP
Learned Hand
Joined: Jul 2005
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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.
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Re: How to make thunderbike's quieter according to....
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Joined: Jan 2005
Posts: 1,204
Learned Hand
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Learned Hand
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What he is saying is that your exhaust sound waves are not able to diffuse into enough of the packing material to quiet the sound effitiently. In order to let more exhaust reach the packing material you have to drill more holes(perforations) to let more of the exhaust sound waves escape into the packing material.....Be sure to wrap the newly drilled holes with packing material.......Angelis
1200CC BIG BORE, W/WISECO PISTONS,.250 STROKED CRANK, PORTED/POLISHED HEADS AND LARGER VALVES, CUSTOM WELDED EXHUAST, DUAL 42MM MIKUNI CARBS.
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Re: How to make thunderbike's quieter according to
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Joined: Jul 2005
Posts: 1,378
Learned Hand
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OP
Learned Hand
Joined: Jul 2005
Posts: 1,378 |
Thats pretty much what i figure he's saying, but i've never heard of a baffle that long packed all the way from one end to the other. Isn't that sorta unheard of? i was thinking along the lines of just drilling holes from the inner spacer about the same length as the stock perforated section and packing that. But i guess the packing would eventually stretch out and unravel towards the header. I don't think i'd wanna drill that entire pipe up to the header and pack it all. doesn't seem right, not to mention it would take forever to drill what would amount to probably 500 holes and more $ for packing.
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Re: How to make thunderbike's quieter according to *DELETED*
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Joined: Jan 2005
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Saddle Sore
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Saddle Sore
Joined: Jan 2005
Posts: 5,172 |
More flags
More fun!
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Re: How to make thunderbike's quieter according to
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Joined: Jul 2005
Posts: 1,378
Learned Hand
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OP
Learned Hand
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hey, it's bad enough having to remove the carb bowls and tops to keep testing various jets. I'm not about to remove the mufflers 10 times! If i do try this i would drill a lot at once and get it over with. It'll either be good or not but i'll be done with it. By the way, the dimentions for the holes and the "stagger" he recommends if i'm not mistaken would be an incredible amount of holes. This would probably take a few hours per baffle and if they are at all hard to drill thru it could take much much longer !
On the other hand i am tempted because i really want quiet badly. And he's offered to send me enough packing to do the job free of charge !
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Re: How to make thunderbike's quieter according to
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Joined: Jan 2005
Posts: 1,204
Learned Hand
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Learned Hand
Joined: Jan 2005
Posts: 1,204 |
Or you could buy muffler inserts from any of your parts companies like JCW, Custom Chrome, etc....
1200CC BIG BORE, W/WISECO PISTONS,.250 STROKED CRANK, PORTED/POLISHED HEADS AND LARGER VALVES, CUSTOM WELDED EXHUAST, DUAL 42MM MIKUNI CARBS.
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Re: How to make thunderbike's quieter according to....
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Joined: Jan 2005
Posts: 17
Complete Newb
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Complete Newb
Joined: Jan 2005
Posts: 17 |
When I built my Stainless Steel pipes I used 1 and3/4 inch perforated pipe for the central core ,this was wrapped in silencer packing for the entire length of the core.
I found it to be still a trifle loud ,so I then made and inserted the reducers that I have told you about.
Before you start drilling I would think about buying or making a fully perforated inner central core the same length as the one in the photo,wrap it in silencer type wool and see how you like the sound.Everyone has a different noise level that they are trying to obtain.
Hope this has been of assistance.
Steve
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Re: How to make thunderbike's quieter according to
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Joined: Jul 2005
Posts: 1,378
Learned Hand
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OP
Learned Hand
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Quote:
When I built my Stainless Steel pipes I used 1 and3/4 inch perforated pipe for the central core ,this was wrapped in silencer packing for the entire length of the core.
I found it to be still a trifle loud ,so I then made and inserted the reducers that I have told you about.
Before you start drilling I would think about buying or making a fully perforated inner central core the same length as the one in the photo,wrap it in silencer type wool and see how you like the sound.Everyone has a different noise level that they are trying to obtain.
Hope this has been of assistance.
Steve
I would but 1)-i know i'll have a hard time finding that.....2)-i'm sure it'll cost a good bit....3)- it's not going to have the end piece or a threaded hole for the screw that holds it in,and that would be i'd have to do that which would be a biotch to say the least.....finding a part thats the right diameter, having it weled on, get a hole tapped for a bolt. Just too much stuff that will take forever to find and do. I just know it's not gonna be easy. Just like the reducers where 2 people said muffler shops did thiers cheap. I called 20 and not one would do it.
So i'll probably drill them at least 1/2 way, then if that helps but not quite enough i'll drill the rest. Either that or if i can find a way to make reducers. Speaking of which, did you find the reducers made them quieter than all that packing?
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Re: How to make thunderbike's quieter according to
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Joined: Jan 2005
Posts: 17
Complete Newb
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Complete Newb
Joined: Jan 2005
Posts: 17 |
Yep...If you just unstall the reducers first you will not have to worry about all this drilling ,packing caper.
Steve
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Re: How to make thunderbike's quieter according to
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Joined: Oct 2005
Posts: 26
Greenhorn
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Greenhorn
Joined: Oct 2005
Posts: 26 |
If all else fails Staintune pipes have good performance and aren't to loud. I had them but they were to quiet to my ears. They are quite expensive though.
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Re: How to make thunderbike's quieter according to
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Joined: Jul 2005
Posts: 1,378
Learned Hand
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OP
Learned Hand
Joined: Jul 2005
Posts: 1,378 |
Ok, i'll look into the reducers first, tho i have no idea where i can get them made, so i'll have to do it myself. Unfortunatly, having to do this by hand the two reducers aren't likely to be exactly the same so i hope that doesn't upset the balance.
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