 D&D Pipe Mod
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You guys prbly think Im crazy for wanting quiet pipes. What can I say...  Well, since I didn't make a deal on getting myself a set of stockers, I decided to quiet down my D&Ds... yeah I know, I ruined a perfectly good set of pipes.  Actually the modification can be reversed if I ever decide to do so. But I doubt I ever will because I really like how it turned out. Now they sound just like the bonnevilles I used to own. Anyway, if anyone is interested, here is a rough diagram of how I did it...  What the picture doesn't show is exactly where I put the "restrictions" (2 freeze plugs and a large washer) in relation to the perforations (or louvers) in the baffle. Basically, they are evenly spaced dividing the perforated section into 1/4s. There is no packing so the outside chamber is hollow. This allows the exhaust to flow back and forth through the louvers. I think it sounds great... and it runs just as strong as it did before the mod. Jon
Jon
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Re: D&D Pipe Mod
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Joined: Mar 2009
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Stickman Yogi
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Stickman Yogi
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That is friggin' awesome! I might just follow your lead on my SSs.
Live to love, love to live.
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Re: D&D Pipe Mod
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Thanks Keith. I do like the looks of my D&Ds. Now that I also like the sound, I am happy!  (I just love to tinker on bikes... almost as much as I like riding them.)
Jon
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Re: D&D Pipe Mod
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I forgot to mention that I originally put only one restriction (freeze plug) in the middle of the baffle. That toned it down some but not enough for me. That's when I decided to go with the configuration above.
Jon
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Re: D&D Pipe Mod
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Joined: Jun 2011
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Complete Newb
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Complete Newb
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How did you mount the "restrictions"? Weld them in?
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Re: D&D Pipe Mod
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Quote:
How did you mount the "restrictions"? Weld them in?
No I just bent the louvers in or out slightly in the spots where I wanted them to stay.
With the big washers, I bent the louvers out a bit. The taper of the outer wall keeps them tight against the bent-out louvers.
With the freeze plugs, I bent the louvers in on both sides of them till they were tight.
...hope that makes sense.
Jon
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Re: D&D Pipe Mod
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Joined: Jun 2011
Posts: 17
Complete Newb
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Complete Newb
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Very cool. I have some JC Whitney 27" turnouts on the way. If they are too loud I was thinking about adding some baffles to tone them down. I like your setup so I can get it "just right". Haven't got them yet so I may not need to, but it's nice to have a plan:-)
Thanks
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Re: D&D Pipe Mod
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Joined: Jan 2005
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Bar Shake
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Bar Shake
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If we meet up in AR Jon, you will have to explain to me in simpler terms what you did. "louvres" "freeze plugs"  My kid is out in the garage right now putting on some D&D's on his America. We live in a very quiet neighborhood and I'm afraid there are going to be some repurcussions. 
"Catching a yellow jacket in your shirt at seventy miles per hour can double your vocabulary" Author unknown
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Re: D&D Pipe Mod
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Joined: Sep 2009
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Learned Hand
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Learned Hand
Joined: Sep 2009
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Same here, Paul,
I'm interested in this 'cos I gutted my TORs a bit too much and I would like to tone them down a little, not much, but just enough so they don't "blow away" the wind noise anymore...
Jon, a bit of explanation of how to bend "louvers" would be great!
Thanks!
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Re: D&D Pipe Mod
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Joined: May 2007
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Worn Saddle
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Worn Saddle
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Will you post a picture of the parts you used?
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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Re: D&D Pipe Mod
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Quote:
If we meet up in AR Jon, you will have to explain to me in simpler terms what you did. "louvres" "freeze plugs"
Yes, Paul, it probably would be easier to explain in person. 
Jon
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Re: D&D Pipe Mod
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Quote:
Jon, a bit of explanation of how to bend "louvers" would be great!
Thanks!
I used a punch to do all the bending of the louvers. Just stuck it in and pryed one way or the other till I got the results I wanted....
Here's a little more detailed explaination:
The "louvers" I'm talking about are the perforations in baffles that come with many aftermarket pipes. These louvers are bent inward toward the exhaust flow.
When I installed the large (1-1/2 inch) washers on the outside of each baffle, I first had to grind a little metal off the inside of the washers so the baffle would fit through the washer.
I wanted the washer in the middle of the louvered section of the baffle. But since I didnt have a welder, I had no way to affix it there. So I just bent out the wall of the baffle (just a little bit) at the row of louvers where I wanted the washer to stop...
To explain, picture a row of about six louvers around the circumferance of the baffle. And about twenty rows of loovers along the length of the baffle...
By bending the metal out at each of the six louvers in the middle row, this gave me a neat little set of six "stops" for my washer.
(I did not have to bend the baffle on both sides of the washers because I realized the taper of the outer wall would hold them against the "stops" I had bent.)...
If you have access to a welder, you might wish to just weld the washers in place. This would ensure a solid modification.
The next step was to grind down the outside of the washers so they would fit into the pipes. This took a while because the outer diamater of the washers were quite a bit bigger than the inside of the pipes...
If you have access to a cutting torch it would probably be easier to just cut washers to size.
Now for the "freeze plugs"... I guess I assumed most of you guys would know what a freze plug is. (Jeff - not saying you dont know, just saying I should not have assumed most would.)... A freeze plug is a round metal plug that plugs certain casting holes in a car engine block. They are called "freeze plugs" because when coolant (lacking antifreeze) freezes in the block, these plugs generally get pushed out by the ice as it expands...
I used 1-1/2 inch plugs. I had to beat them into place because, remember, the louvers in the baffle protrude inward. This means, once I got them in place, I had to go back and re-bend all the louvers back into their original places. (Used a punch and a hammer to do this.) I bent the louvers a little more on each side of the plugs to "pinch" them into place. (Again a welder would be nice here.)
So, is that clear as mud now?
Last edited by jarnold; 07/05/2011 2:03 AM.
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Re: D&D Pipe Mod
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Quote:
Will you post a picture of the parts you used?
Soon as I get a chance, I can take my camera by the parts store and snap a couple shots.... Shoulda done that while doing the mod. 
I may try to make another (better) diagram too.
Jon
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Re: D&D Pipe Mod
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By the way, I just thought I should mention that if you go to the parts store and ask for freeze plugs, they might hand you some rubber plugs. Obviously you don't want the rubber ones, you want the solid metal ones.
Jon
Jon
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Re: D&D Pipe Mod
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Joined: May 2007
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Worn Saddle
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Worn Saddle
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Do I read this correctly that you made three chambers in the pipe by modifying the baffle and used no glass? Kept the performance? Pretty darned clever and not so hard to replicate, thank you very much.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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Re: D&D Pipe Mod
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Quote:
Do I read this correctly that you made three chambers in the pipe by modifying the baffle and used no glass? Kept the performance? Pretty darned clever and not so hard to replicate, thank you very much.
Yeah. Basically that's it. Still plenty of exhaust flow - apparently. I certainly cant tell the difference in performance. I love it!
Happy to share.
Jon
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Re: D&D Pipe Mod
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Joined: May 2007
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Worn Saddle
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Worn Saddle
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Quite a bit like Flowmaster's auto exhaust with strategically placed baffles and no glass. I think I'm going to give it a go with my SS canons and see if I can just take the edge off.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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Re: D&D Pipe Mod
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
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Quote:
Quite a bit like Flowmaster's auto exhaust with strategically placed baffles and no glass. I think I'm going to give it a go with my SS canons and see if I can just take the edge off.
If ya give it a go, I'd be interested in knowing how things turn out. I too would like to 'take the edge off' my SSs. Probably won't get around to doing anything about it before next winter though.
Live to love, love to live.
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