Author Topic: 350 Muffler Dissection  (Read 952 times)

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Offline davis

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350 Muffler Dissection
« on: November 30, 2016, 01:16:16 PM »
Thought a few would like to see a 350 muffler's internals. I like Bridgestone's attempt at an expansion chamber with a reverse cone and the baffle acting as the stinger. I did this to de-dent and clean out the carbon buildup. Not hard to do and easy to reweld with decent welding skills. I used this approach with several gas and oil tanks. The technique makes like-new parts (after chrome and paint) from dented and internally rusted or carboned parts that may otherwise have been scrapped.

- Bob

Offline slawsonb

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Re: 350 Muffler Dissection
« Reply #1 on: November 30, 2016, 01:44:12 PM »
In my younger days, I considered splitting the mufflers and putting a prefabricated expansion chamber inside to create a "sleeper". I guess BS beat me to it. Thanks for the pics, Bob. I have looked into the ends of these mufflers many times trying to figure the internal configuration out. Now it's nicely documented.
...bert

Offline hardy

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Re: 350 Muffler Dissection
« Reply #2 on: November 30, 2016, 05:48:21 PM »
My mufflers are in poor condition also and I had considered the same "hidden expansion chamber" idea! Much nicer that the flat plate that Yamaha use to reflect the wave in a rd400 muffler lol

Ryan

PS any chance of attaching a pic with the baffle inserted?
« Last Edit: December 01, 2016, 01:24:19 AM by hardy »

Offline davis

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Re: 350 Muffler Dissection
« Reply #3 on: December 01, 2016, 04:44:31 PM »
Here you go Ryan.

Online moonpup

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Re: 350 Muffler Dissection
« Reply #4 on: December 01, 2016, 08:41:24 PM »
Hey Bob, got any sliced up GTO mufflers to complete the package?  :o
« Last Edit: December 01, 2016, 08:46:01 PM by moonpup »
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline davis

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Re: 350 Muffler Dissection
« Reply #5 on: December 02, 2016, 05:16:51 AM »
No Bert, but a wrecked pair could be resurrected.

Offline slawsonb

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Re: 350 Muffler Dissection
« Reply #6 on: December 02, 2016, 10:09:40 AM »
Bob, I consider you callin" 'pup Bert a compliment. ;D
...bertpup

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Re: 350 Muffler Dissection
« Reply #7 on: December 02, 2016, 10:18:17 AM »
My psychiatrist say it's just a case of multiple personalities.....but I got some good meds outta the visit!  8)
Confucius say... "Better to have Bridgestone than Kidneystone"

Offline slawsonb

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Re: 350 Muffler Dissection
« Reply #8 on: December 02, 2016, 11:46:07 AM »
Maybe that's why there have been reports of me being in Texas...??
...bert

Offline BRT-GTR

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Re: 350 Muffler Dissection
« Reply #9 on: December 02, 2016, 11:54:18 AM »
                     Your never alone with.............schizophrenia  ::) --------------- a new slant on the old Malboro ciggy advert? anyone remember?

Anyway, very useful photos, Bob. Always thought there was an expansion chamber hiding in there, it's hinted at, on the cutaway drawing of the GTR pipe in the parts manual, P38. You've confirmed it.                At the  same time, they went to all that trouble to incorporate a tuned pipe in an innocuous looking silencer and then had to put damn great dents in it to clear the frame, thus upsetting the operation of the pipe !!  :-[

    http://bridgestonemotorcycleparts.com/PDF/BS350PartsManual.pdf

   Was planning to split a corroded pipe in my collection, saved me a job.   Now we can see what's in there, will have a go at making a mandrel to take some of the worst dents out of my pipes.
                                             Brian.
« Last Edit: December 02, 2016, 12:10:21 PM by BRT-GTR »
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Offline OldSwartout

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Re: 350 Muffler Dissection
« Reply #10 on: December 02, 2016, 05:53:32 PM »
That's a pretty good representation of the real thing in the parts catalog.  This whole thread is very interesting; the pipes on mine have a loose baffle inside (secured with sheet metal screws from the outside for the last 30 years), plus a few small dents. When it comes time to rechrome them, I'll probably cut them open and fix all the problems first..
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline BRT-GTR

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Re: 350 Muffler Dissection
« Reply #11 on: December 03, 2016, 07:58:42 AM »
             A question, Bob.  Below the rear footrest hanger there is a clearance recess (I.E. damn great dent !) at the back of the silencer to clear the centrestand foot (I think). Does this intrude into the internal reverse cone.

          Was the incorporation (disguising ?) of a tuned pipe in the silencer a first for BS on a road machine ? . I don't have sufficient knowledge of previous Japanese 2S models to answer this. Anyone?

        Brian.
Growing old is compulsory, Growing up is optional.

Offline davis

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Re: 350 Muffler Dissection
« Reply #12 on: December 03, 2016, 08:48:19 PM »
The only section of the muffler chamber that is not round is the indentation at the inlet end as shown in the first photo. The three bulkheads and the cone are round and spot welded to one muffler half (so separation is easy).

Offline RebusCom

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Re: 350 Muffler Dissection
« Reply #13 on: December 11, 2016, 08:34:49 PM »
If you'd like to make the muffler run even quieter, just weld on some additional length to the baffle tube so that the exhaust gasses exit the chamber at the start of the cone vs. the aft end.  I'm talking open, non-perforated pipe.  It does not affect the reflected wave, the back pressure or the performance, but does reduce noise.

Scott
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