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Re-packing muffler cans
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2bims



Joined: 03 Apr 2010
Posts: 6553

PostPosted: Fri May 10, 2019 8:42 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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quikduk



Joined: 13 Aug 2016
Posts: 273
Location: Southern California, USA

PostPosted: Fri May 10, 2019 8:54 pm    Post subject: Reply with quote

I have re-packed multiple exhausts with standard results. I use "rock wool" as per this note:

"Mineral Wool Insulation. ... Also known as rock wool or slag wool, this material is one of the oldest types of insulation composed of noncombustible fibers and can withstand heat in excess of 1,800 degrees F. Unlike fiberglass insulation, mineral wool does not melt when exposed to such high heat."

I also use a thinner rock wool "blanket" rather than "packing" it in the can. Wrap a thin (1-2 cm) blanket around the inner baffle and secure with either SS safety wire or SS tie wraps. I am only trying to minimize any minor resonance that might seem annoying yet limit the sound waves a bit.

Header wrap could work in a pinch however it would likely significantly quell some sound.

Let us know how it goes.
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Evilchicken0



Joined: 12 May 2010
Posts: 2955
Location: London

PostPosted: Sat May 11, 2019 11:28 pm    Post subject: Reply with quote

Header wrap rots pipes.
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Evilchicken0



Joined: 12 May 2010
Posts: 2955
Location: London

PostPosted: Sat May 11, 2019 11:42 pm    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

Type approval???
Simply a bike exhaust has to limit the bikes noise to a certain db, if that cant be guaranteed the way around it is to put Not For Road Use on the cans.
Bimota used 100 bhp Suzuki engines in the SB6 when the limit was in.
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brian



Joined: 22 Aug 2011
Posts: 3241
Location: Australia

PostPosted: Sat May 11, 2019 11:52 pm    Post subject: Reply with quote

Evilchicken0 wrote:
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

Type approval???
Simply a bike exhaust has to limit the bikes noise to a certain db, if that cant be guaranteed the way around it is to put Not For Road Use on the cans.
Bimota used 100 bhp Suzuki engines in the SB6 when the limit was in.


Ahh ok, gotcha
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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: Wed May 15, 2019 5:43 am    Post subject: Reply with quote

Checked with a magnet, the stock SB6 cans have a full stainless (400 series is magnetic) layer under the alloy skin, no wonder they're so damn heavy
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brian



Joined: 22 Aug 2011
Posts: 3241
Location: Australia

PostPosted: Wed May 15, 2019 8:20 am    Post subject: Reply with quote

Gammaboy wrote:
Checked with a magnet, the stock SB6 cans have a full stainless (400 series is magnetic) layer under the alloy skin, no wonder they're so damn heavy


These gutted mufflers are also very heavy.... I’ll weigh both sets and check the difference, I don’t think there will be a lot of difference even though they only have what’s in the photos, aluminium outer shell and the steel baffle in the middle. I’m guessing most of the weight is in the collector and pipes
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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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vort28



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

PostPosted: Wed May 15, 2019 12:20 pm    Post subject: Reply with quote

Here you go Brian.Pictures of my race can.




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brian



Joined: 22 Aug 2011
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Location: Australia

PostPosted: Wed May 15, 2019 11:39 pm    Post subject: Reply with quote

vort28 wrote:
Here you go Brian.Pictures of my race can.






Thanks Stu. Is yours a genuine Bimota race system branded Lafranconi?
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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
Posts: 3241
Location: Australia

PostPosted: Thu May 16, 2019 7:31 am    Post subject: Reply with quote

SB6 headers - 4.5 kgs
SB6 stock mufflers - 5.5 kgs
SB6 race mufflers - 4.3 kgs
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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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vort28



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

PostPosted: Thu May 16, 2019 12:42 pm    Post subject: Reply with quote

I'll try to remember to weigh them over the weekend Brian
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