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'Baffle' science discussion

11 posts from 5 voices
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  1. Tucci641
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    Could I get a discussion going with some of our hands on 'brothers' about baffles. Let me give some background. So I started like many of us with wanting more sound from my exhaust. I tried the drilling. Then I tried 'slips'. Finally I went to a full system from BUB . The ones that came with the set were too loud, reminding me too much of my harley days with the cam and all that. I just wanted a good sound ( you know the kind that makes you turn your head and look). So I ordered their quietter baffles but they are still flippin loud. I read you can wrap the baffle with steel wool which will change the sound hopefully toning it down some. Has anyone tried doing this and what kinda pains am I going to cause myself?

  2. yhoower
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    Tucci641 there are plenty of threads on this forum about baffle wrapping. Do a search and I'm sure you'll find plenty of good advice.

  3. Tucci641
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    Still learning my way around but will try that thanks for the suggestion.

  4. Tucci641
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    Nothing coming up as far as repacking using steel wool, fiberglass is all that comes up?

  5. MigejCojode
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    Something to remember is that steel wool is flammable. Not that it will burn your bike down (I don't think so anyway) but it burns off much quicker than asbestos or fiber glass.

    You really wanna play with baffles work on making your own. The sound deadening ability of the baffle comes from breaking up the exhaust "plug" and bouncing some of it back into the void behind it. The louvers that enter or exit the stream control how much you break up the "plug;" the wadding and space behind the louvers control how the gas vented exits or re-enters the exhaust stream. There are other variables too, like the interior diameter of the baffle, length of the baffle etc. Anyways baffle blanks are available in most common diameters from many local cycle shops. Get in and have a look then work from there.

  6. Jonezpoj
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    Now I'm totally baffled.........

  7. Tucci641
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    Might just do that Mikey, thanks for the Info. I did wrap the baffle with 1layer of wool and it ran pretty quiet (too much so) but it did get a bit louder after running it around the block. The baffle is plugged at the intake end allowing the exhaust to make its way thru the cuts only. I wrapped my steel around the cuts securing it with steel braided wire. It smoked for awhile while I warmed up the engine but that's from the zinc I put on the screws. Figured I better since I may be taking everything apart again until I figure out how nd what I'm doing.

  8. pgv
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    I added Roadhouse slip on mufflers to my 08 RSTD. Then added 4" baffles wrapped with four stroke muffler packing. I secured the packing with steel screen and metal zip ties around the outside of the baffles. Really helped quiet the exhaust note, deaden the plug(thanks Mikey, see above) and created back pressure on exhaust which controls popping on deceleration, nice purr at idle and cruising, real bark on acceleration. I have had this on for about 1500 miles and checking often, has not burned up or blown out. Make sure you have a flange on the muffler that is covered by exhaust tips to hide install of baffles. This set up cost me about $25.00 bucks. Many baffles on www., make sure that the outside diameter of the baffle fits the inside diameter of your exhaust, packing was at local dealer, screen and zip ties at Lowe's. There are many fine afterMarget baffles ready for install, have not tried, Smartparts.com Hard Kore Quiet Baffles, but have seen this on YMF and many members seem to have success with this product. God's speed.

  9. Tucci641
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    Could you tell me more about the packing material and the baffle. Is the baffle open or closed on the end facing the jugs?

  10. pgv
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    Could you tell me more about the packing material and...

    The packing material is manufactured by FMF, I got at my local Yamaha dealer. Get four stroke packing material, it is much thicker than two stroke material. The baffle I bought from ebay, 4" in length with an O.D. of 1 7\\8", then tapers to a 1" pipe, that fit the I.D. of my 2" exit pipe on the muffler, cost 6 bucks+ shipping. There are several lengths and designs of baffles. Some people say these cheap baffles do very little to soften the exhaust note without some wrap or packing material. By the way, my Roadhouse muffler is not a straight pipe, is does have scavenger webbing, this is not exactly a baffle. A scavenger collects the expanding exhaust gas, pushes this to the outside of the muffler wall, then tapers the gas down to the 2" exit pipe. This creates an exhaust pulse, the rumble we love, but too loud for some riders and municipalities, other wise known as cops. Most baffles have washers, rings, cuts, something inside the pipe that slows exhaust gas, creates back pressure and softens the expanding pulse. Some state law requires baffles, straight pipes are not allowed. Some officers now carry decibel meters to check for sound limits. I am not sure about your question, "Is the baffle open or closed on the end facing the jugs?" I wrapped the outside of the tapered end of the baffle. This slows the expanding exhaust gas and softens the pulse more than just a baffle alone. Then inserted the tapered end of the baffle into the muffler, drilled a hole in the top of the exhaust exit pipe and secured with bolt and nut provided with baffle. The baffle is flush with the end of the exit pipe, muffler tips then hide the exhaust pipe where I installed the baffle. I hope this helps. Sometimes trial and error is the only answer. Hopefully not an expensive error. Ask many people many questions. There are no dumb questions, just dumb answers. I hope mine is not one of them. Some day I will figure out how to put pictures in my post. Good luck.

  11. Tucci641
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    Thanks I appreciate the response.....

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