SuzukiSavage.com /cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Baffling situation! /cgi-bin/YaBB.pl?num=1311791747 Message started by ksthumper on 07/27/11 at 11:35:47

Title: Baffling situation! Post by ksthumper on 07/27/11 at 11:35:47 har har... So I have this open short muffler that has the silliest baffle i've ever seen in a bike. Kinda useless as baffles go considering there is no back plate to force the air around. I was considering crimping the end of this together (side towards the header) to reduce the open airflow. It actually looks like the end used to have a donut cap on the end of it that was lopped off. Any suggestions? http://i1200.photobucket.com/albums/bb331/milkandcookie2000/Mobile%20Uploads/IMG_5368.jpg

Title: Re: Baffling situation! Post by EJID on 07/27/11 at 11:39:29 Several aftermarket baffles look like that. All those little tabs are suppopsed to "grab" some of the exhaust as it passes by, but most of it goes right out the center. Not much more than a straight pipe. Did you see what this guy did to his Jardine baffle? I don't know that your baffle has enough of a lip to do the same though. http://suzukisavage.com/cgi-bin/YaBB.pl?num=1311355746/

Title: Re: Baffling situation! Post by ksthumper on 07/27/11 at 15:25:33 Yeah to tell you the truth, that was where I got the idea of crimping the end. I just wanted to know if anyone else has messed with it. I'm gonna try it out this weekend with it modified. If all else fails i can just cut the end off again lol

Title: Re: Baffling situation! Post by thumperclone on 07/28/11 at 07:51:32 u can wrap it with muff fiberglass and stainless tye wire.. experiment to tune to your liking...

Title: Re: Baffling situation! Post by onelunger on 07/28/11 at 10:13:53 Yup, those style baffles are pretty ineffective at quieting down an exhaust. They also tend to create a "poppy" kind of sound. Not my favorite style for a single cyl. engine. For engines that have a natural tendency to get this kind of sound I prefer a "chambered" style exhaust. It tends to create a smoother exhaust note. The packing that should be around it also has a tendency to burn up and blow out, making it even louder. My Jardine had a very similar type of baffle (I'm the one that modded mine). If there was a "doughnut cap" on the end that was cut off it's going to be difficult to quiet it down. You need that cap to seal off the end. You can take some measurements and go to the local auto parts store and try to find an exhaust reducer that will just fit inside your pipe (it needs to be snug) and can be welded to the baffle. You may try punching a tab down into the center opening kinda like a "Screaming Eagle" Sportster baffle. This forces some of the exhaust gasses to go to the "outside" of the baffle and it then goes back into the center core (and out the end of the exhaust pipe) via the louvers that are punched into it. http://www.cycle-shack.com/cycle/html/images/2006/1529.jpg Anytime you can divert the flow of the exhaust it will lose some of it's sound energy and become quieter. If you can maintain a smooth flow and not cause a lot of turbulance you can maintain your power as well.

Title: Re: Baffling situation! Post by ksthumper on 07/28/11 at 11:40:10 Well after some tinkering I found that I could stuff a 2" universal baffle insert inside the current baffle perfectly. It reduced the sharpness of the sound but is still very "poppy". I'll try to find some fiberglass matting to cover it and give that a whirl. I'd post a before/after video but my camera over modulates it too much. If I could find a whole dyna exhaust I'd rather use that but you deal with what you can find ya know?

Title: Re: Baffling situation! Post by EJID on 07/28/11 at 14:18:48 Using Onelunger's link I found some good other good ideas you  might be able to work with...these look similar, but crimped a few inches in from one end. http://www.cycle-shack.com/cycle/agora.cgi?picserve=1546.jpg

Title: Re: Baffling situation! Post by ksthumper on 07/29/11 at 09:30:37 Okay so here's a picture of the baffle with the universal 2" insert. The holes for the mount actually line up perfect for this. http://i1200.photobucket.com/albums/bb331/milkandcookie2000/Mobile%20Uploads/IMG_9580.jpg Now what I'm wonderig about is how to wrap the darn thing. I only have about a 1/8" of space where the baffle cuts down for the louvers. Since I have that universal insert blocking the end, can I just roll up some and stuff the baffle with it? Or will that just blow out and smoke forever as the loose fibers burn off?

Title: Re: Baffling situation! Post by EJID on 07/29/11 at 10:02:11 Personally, I would just throw that in and give it a try. Looks like it might work as is. With such a small amount of space, I don't think that you can wrap any additional baffling in there.

Title: Re: Baffling situation! Post by ksthumper on 07/29/11 at 10:13:08 Well I I tried it both ways. With the way it was it sounded bad, no backpressure and way to loud. With the 2nd baffle installed it took the sharpness of the sound but pulling back on the throttle made it sound like it was a fully open pipe. Now I stuffed the packing inside the back end of the baffle and it now sounds more like a softtail and throttle up sounds much smoother. However now it's puffing black smoke at me. I'm assuming that's the wrap curing? per say. I'll try to get a video up later for sound.

Title: Re: Baffling situation! Post by ksthumper on 07/29/11 at 10:52:58 Took the bike for a quick spin around the block and suffice to say I have some rejecting to do. 1 - 35mph an half throttle are fine but pulling back makes it stutter and on decel the idle dropped VERY low when I rolled to a stop. The difference in backpressure is amazing! Now for the fun of tuning...

Title: Re: Baffling situation! Post by bill67 on 07/29/11 at 10:56:35 That stuffing goes around the baffle.It shouldn't change the back pressure hardly at all.

Title: Re: Baffling situation! Post by ksthumper on 07/29/11 at 11:10:40 Oh I know that, it's the second baffle that made the change. I had previously been using a chopped up dyna with the baffle knocked out so going from that to this is why I think there was such a change in performance. Way too rich more than likely. But what is the hazard of having the packing inside the baffle? It's not likely that it's going to fly out.

Title: Re: Baffling situation! Post by Max_Morley on 07/29/11 at 11:17:30 I think it will just get hot and burn out the first long run. Max

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