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Re-packing muffler cans
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Gammaboy



Joined: 25 Feb 2016
Posts: 184
Location: Brisbane, Australia

PostPosted: Wed May 08, 2019 6:06 am    Post subject: Reply with quote

brian wrote:
Do you think the stock mufflers would be the same inside as these ‘race’ mufflers? Meaning, will the stock mufflers have a straight through baffle or a different series of baffles to make them more quiet? If that’s the case then simply packing these ‘race’ cans tightly may give me the result that I want..... loud but not offensively loud and tinny.

From shining a torch up the stock cans, no, they're not the same construction, and they're not a straight through adsorption muffler like a glass packed can. Just wrap it relatively tight and it'll be as loud as it's going to be... if you want it louder, roll some alloy sheet around half the length of the perforated tube and wire it in place, then wrap with the wadding.
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brian



Joined: 22 Aug 2011
Posts: 3241
Location: Australia

PostPosted: Wed May 08, 2019 9:28 am    Post subject: Reply with quote

Gammaboy wrote:
brian wrote:
Do you think the stock mufflers would be the same inside as these ‘race’ mufflers? Meaning, will the stock mufflers have a straight through baffle or a different series of baffles to make them more quiet? If that’s the case then simply packing these ‘race’ cans tightly may give me the result that I want..... loud but not offensively loud and tinny.

From shining a torch up the stock cans, no, they're not the same construction, and they're not a straight through adsorption muffler like a glass packed can. Just wrap it relatively tight and it'll be as loud as it's going to be... if you want it louder, roll some alloy sheet around half the length of the perforated tube and wire it in place, then wrap with the wadding.


Cool thanks Ben, that’s the kind of info I’ve been chasing. I’ve ordered some packing material, so will give it a go
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vort28



Joined: 22 Mar 2010
Posts: 2109
Location: Northwest , UK

PostPosted: Wed May 08, 2019 12:10 pm    Post subject: Reply with quote

brian wrote:
Do you think the stock mufflers would be the same inside as these ‘race’ mufflers? Meaning, will the stock mufflers have a straight through baffle or a different series of baffles to make them more quiet? If that’s the case then simply packing these ‘race’ cans tightly may give me the result that I want..... loud but not offensively loud and tinny.


The standard cans have a staggered baffle with a sort of cross over chamber and smaller perf tubing , like most standard can arrangements.
The interesting thing is your rear pipe work has the primary can in it. My race pipe does not have the primary can in the single collector pipe , its just a 70mm ( or whatever ) pipe from the joint to the silencer split.
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brian



Joined: 22 Aug 2011
Posts: 3241
Location: Australia

PostPosted: Wed May 08, 2019 12:18 pm    Post subject: Reply with quote

vort28 wrote:
brian wrote:
Do you think the stock mufflers would be the same inside as these ‘race’ mufflers? Meaning, will the stock mufflers have a straight through baffle or a different series of baffles to make them more quiet? If that’s the case then simply packing these ‘race’ cans tightly may give me the result that I want..... loud but not offensively loud and tinny.


The standard cans have a staggered baffle with a sort of cross over chamber and smaller perf tubing , like most standard can arrangements.
The interesting thing is your rear pipe work has the primary can in it. My race pipe does not have the primary can in the single collector pipe , its just a 70mm ( or whatever ) pipe from the joint to the silencer split.


These pipes look the same as my stock pipes other than the plate welded on which has ‘race use only’ stamped on it. Maybe they are a modified stock set? I’ll measure the size of the pipes and compare with the stock ones tomorrow
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Current motorcycles - '99 Bimota DB4 #104, '96 Bimota SB6 #1165, ‘94 Bimota DB2 J #652, '99 Bimota DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, ‘94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, ‘61 BSA A10 650
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Evilchicken0



Joined: 12 May 2010
Posts: 2955
Location: London

PostPosted: Wed May 08, 2019 3:15 pm    Post subject: Reply with quote

I think they're whats called "Cored" pipes. You start with a standard system and change the internals of the cans. The "Race" cans also have wider outlet pipes (the bits that stick through the seat unit).
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vort28



Joined: 22 Mar 2010
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Location: Northwest , UK

PostPosted: Wed May 08, 2019 5:12 pm    Post subject: Reply with quote

Evilchicken0 wrote:
The "Race" cans also have wider outlet pipes (the bits that stick through the seat unit).


Ah YES , good point EC , forgot about that , getting old you know.
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Evilchicken0



Joined: 12 May 2010
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PostPosted: Wed May 08, 2019 9:33 pm    Post subject: Reply with quote

vort28 wrote:
Evilchicken0 wrote:
The "Race" cans also have wider outlet pipes (the bits that stick through the seat unit).


Ah YES , good point EC , forgot about that , getting old you know.

Which could mean the internal dia of the baffles is larger too
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brian



Joined: 22 Aug 2011
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PostPosted: Thu May 09, 2019 4:08 am    Post subject: Reply with quote

I’ve compared these mufflers to the standards mufflers from my bike without pulling the end cans apart again. Externally they are identical, same size pipes except for the tips that exit the cans.... these tips are larger diameter. The welding on the tips is sub-standard so I’m guessing these are definitely modified stock mufflers.
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Current motorcycles - '99 Bimota DB4 #104, '96 Bimota SB6 #1165, ‘94 Bimota DB2 J #652, '99 Bimota DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, ‘94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, ‘61 BSA A10 650
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brian



Joined: 22 Aug 2011
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PostPosted: Thu May 09, 2019 7:50 am    Post subject: Reply with quote




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Current motorcycles - '99 Bimota DB4 #104, '96 Bimota SB6 #1165, ‘94 Bimota DB2 J #652, '99 Bimota DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, ‘94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, ‘61 BSA A10 650
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brian



Joined: 22 Aug 2011
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Location: Australia

PostPosted: Thu May 09, 2019 11:32 am    Post subject: Reply with quote

brian wrote:




I'm guessing that if I ground off the plate I would find the same stamping on this one as on the stock pipe. I don't know why anyone would go to the trouble of making the plate and welding it on, unless the modification was done at the factory?
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Current motorcycles - '99 Bimota DB4 #104, '96 Bimota SB6 #1165, ‘94 Bimota DB2 J #652, '99 Bimota DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, ‘94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, ‘61 BSA A10 650
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Evilchicken0



Joined: 12 May 2010
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Location: London

PostPosted: Thu May 09, 2019 1:09 pm    Post subject: Reply with quote

brian wrote:
brian wrote:




I'm guessing that if I ground off the plate I would find the same stamping on this one as on the stock pipe. I don't know why anyone would go to the trouble of making the plate and welding it on, unless the modification was done at the factory?

So they don't have to get type approval for a bike with these on I guess.
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brian



Joined: 22 Aug 2011
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Location: Australia

PostPosted: Thu May 09, 2019 2:12 pm    Post subject: Reply with quote

Evilchicken0 wrote:
brian wrote:
brian wrote:




I'm guessing that if I ground off the plate I would find the same stamping on this one as on the stock pipe. I don't know why anyone would go to the trouble of making the plate and welding it on, unless the modification was done at the factory?

So they don't have to get type approval for a bike with these on I guess.


Sorry, I don't know what that means Rolling Eyes
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Current motorcycles - '99 Bimota DB4 #104, '96 Bimota SB6 #1165, ‘94 Bimota DB2 J #652, '99 Bimota DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, ‘94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, ‘61 BSA A10 650
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Gammaboy



Joined: 25 Feb 2016
Posts: 184
Location: Brisbane, Australia

PostPosted: Thu May 09, 2019 11:42 pm    Post subject: Reply with quote

Welding on the tips of the "race use only" pipes doesn't look particularly factory - I suspect these are modified stockers vs the Lafranconi built race cans Boris has.
It looks to me like there might have been a full stainless skin under the alloy (like the thread on gutting DB4 cans) and it's been cut with a grinder up at the inlet end of the can?
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DB1 860



Joined: 23 Mar 2014
Posts: 113
Location: Sydney

PostPosted: Fri May 10, 2019 6:19 am    Post subject: Reply with quote

Over the years Ive repacked My Termignoni Carbon mufflers on my 996 and done a few of my mates mufflers as well.

I removed the old packing that seems to separate after a while, leave the stainless gause , wrapping the sheet muffler matting tighty around the inner core until its slighty bigger than the muffler skin, I then compress the matting with masking tape so that it slides in easy. If you don't pack them tightly the packing seems to move and end up at the end of the muffler.

I think because your muffler core is straight through its still going to be louder than your standard ones, which are not I presume.
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2bims



Joined: 03 Apr 2010
Posts: 6553

PostPosted: Fri May 10, 2019 8:11 am    Post subject: Reply with quote

brian wrote:
Evilchicken0 wrote:
brian wrote:
brian wrote:




I'm guessing that if I ground off the plate I would find the same stamping on this one as on the stock pipe. I don't know why anyone would go to the trouble of making the plate and welding it on, unless the modification was done at the factory?

So they don't have to get type approval for a bike with these on I guess.


Sorry, I don't know what that means Rolling Eyes


Youre not the only one.....The opposite I've seen...where someone has put very neat plates onto a Zard Squishy carbon can end system on a Db5...with no baffles...but then had beautiful alloy plates made up....in black...with the E13 words and Db levels and specs written into it...just like "the real thing" to be able to get his bike reg'd and help with being pulled over...as the plates are real wonderful, professional
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