Author Topic: Homemade Baffle  (Read 4455 times)

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Offline weekend_junkie

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Homemade Baffle
« on: May 07, 2010, 09:46:00 AM »
My CB350F I recently picked up had open pipes with turn outs on stockish looking headers.  I'm not too hung up on originality with this bike and it looked alright, but it sounded like a race boat with the open pipes.  I needed a solution. 

Step 1: Look at exhaust and realize there is no easy way to get a baffle in there because of the turn-outs.




Step 2: Put something in there anyway.  This was a large Pepsi can with steel wool.  It sounded good, but looked horrible.  I'm not sure how the carbs are jetted, so It's a gamble if this is too much back preassure.  The inside of the pipe is caked with carbon, so I can only imagine this helps.




Step 3: Realizing that step 2 looked horrible and was never going to be the final solution, this was easy to do.



Steps 4 and 5 invlove me buying cans of diced tomatoes , tomato paste and asparagus, then eating the contents.  I'm sure you can take my word for it, although I have pictures if I get enough requests.

Step 6: I started to make some parts out of the cans as well as some sheet metal.  I don't weld so its just cut/crimp/drill/rivet from here out.




Step 7:  This is about the time that I took a break and went to the ER to have my finger stitched up.  Sheet metal is sharp.  I’ll wear gloves next time.




Step  8: This is the exhaust baffle I made before I punched holes in it




Step 9: Installed to cap!




Step  10: Since the smaller can is smaller than the exhaust pipe, I used a larger can to fill the gap and provide more area for packing.




Now I need to build another one, pack this and see how it sounds on the bike. I have a similar idea for how I can reattach the turn-out, but that is a bit further down the line.
Dan
2012 Triumph Tiger Explorer / 1981 CB900F / 2002 VFR800 / 1973 CB350F / 1973 CB350F mistake / 1976 CB360T Cafe /1976 CB200 Cafe / 1989 GL1500 w/ sidecar / 1949 IMZ w/ sidecar

Offline hondaface75

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Re: Homemade Baffle
« Reply #1 on: May 08, 2010, 06:04:54 AM »
Interested in seeing how this works out/sounds for you. Ive been wanting some baffles as well but dont have a welder or skills to use one.

Offline ksmith0034

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Re: Homemade Baffle
« Reply #2 on: May 08, 2010, 07:12:45 AM »
video for sound please!
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traveler

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Re: Homemade Baffle
« Reply #3 on: May 08, 2010, 08:25:18 AM »
Only thing I can see is....it may baffle so much it sounds like a wet fart when idling.

The tricks I know of mostly just add backpressure, but don't muffle sound much!

Soup cans WILL crew your mitts to pieces! :(

~Joe

Offline weekend_junkie

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Re: Homemade Baffle
« Reply #4 on: May 08, 2010, 10:37:48 PM »
Hondaface, you don't need skills.  You just need a friend dumb enough to lend you and arc welder and a building that you don't mind accidently burning down.  Laying a bead is not that tricky if you have a steady hand.  The tricky part for me would be welding and getting my wife to not kill me when I do projects like this in our spare bedroom.

Soup cans WILL crew your mitts to pieces! :(

???????  Are the mitts a stock piece?  Hondaline accessory perhaps? If so, aren't they 'crewed' already from the factory?  I am just a brick or SHOULD I be completely confused as to what you mean?

Upon closer inspection, there IS some baffling in the pipe.  However, I think the combination of being far from the tip, being very open baffling and being who-knows how old all combine to make it just about useless.  It did, however, give me a little trouble when I tried to slide my new baffling can in place.  A little trimming off the larger exterior can made for a clean fit AND I think my new baffle inserts have slided right into the originals which means they are centered up nicely.  After the trial fitting, I pushed some muffler pack in the outer-can space and punched a rivet to hold the whole thing steady.  Went for a 10 minute ride and the bike runs and sounds great.  I ALMOST took some video today and will get on that now that my basterization thread is getting some replies - success!

Dan
2012 Triumph Tiger Explorer / 1981 CB900F / 2002 VFR800 / 1973 CB350F / 1973 CB350F mistake / 1976 CB360T Cafe /1976 CB200 Cafe / 1989 GL1500 w/ sidecar / 1949 IMZ w/ sidecar

traveler

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Re: Homemade Baffle
« Reply #5 on: May 09, 2010, 08:22:20 AM »
Cut your mitts to pieces.....mitts=hands.

Soup can metal is extremely sharp! >:(

~Joe

Offline weekend_junkie

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Re: Homemade Baffle
« Reply #6 on: May 09, 2010, 09:36:53 AM »
Ah ha, I get it now... and I agree.  I never heard the term 'crew' before.

But does anyone think this is going to last?
Dan
2012 Triumph Tiger Explorer / 1981 CB900F / 2002 VFR800 / 1973 CB350F / 1973 CB350F mistake / 1976 CB360T Cafe /1976 CB200 Cafe / 1989 GL1500 w/ sidecar / 1949 IMZ w/ sidecar

Offline hondaface75

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Re: Homemade Baffle
« Reply #7 on: May 09, 2010, 10:44:15 AM »
I had used steel perferated sheets cut and crimped to be riveted in my exhaust tips. While holding stainless steel wool inside. Wish I had pics, it looked good and sounded great. But alas the constant vibration from the exhaust pulses worked the steel wool through the openings in the mesh. I'd have to repack it every other week or so. No buildings to burn down or friends with arc welders either. Just running open pipes now :)

Offline mgbgt89

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Re: Homemade Baffle
« Reply #8 on: May 09, 2010, 05:43:01 PM »
Hey! I ride a red 350F with custom soup can exhaust. My soup can is on the outside though, patching a large hole in the muffler. If i let it get dirty enough, most don't notice my cambells muffler.

Offline weekend_junkie

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Re: Homemade Baffle
« Reply #9 on: May 09, 2010, 07:56:22 PM »
I put fiberglass inside, but it doesn't really get a lot of flow like other designs would.  The more I think about it, I kinda created a very long pea-shooter that happens to not look the part.  Also, I would guess your steel wool was blowing out from rust more than anything.  Someone suggested brass wool, since you might get a longer life before it corrodes.
Dan
2012 Triumph Tiger Explorer / 1981 CB900F / 2002 VFR800 / 1973 CB350F / 1973 CB350F mistake / 1976 CB360T Cafe /1976 CB200 Cafe / 1989 GL1500 w/ sidecar / 1949 IMZ w/ sidecar

Offline hondaface75

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Re: Homemade Baffle
« Reply #10 on: May 10, 2010, 04:50:49 PM »
No corrosion on the wool at all. Got covered in soot mostly  :) or blew out before it had a chance to rust. Either way ineffective.