yellowcab
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| posted on 25/3/12 at 06:52 PM |
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Repacking a sealed exhaust?
Want to quieten down my MK Indy in preparation for the track days I want to do, I believe from the previous owner that the wadding from the current
exhaust departed some months back lol
I've removed the silencer, and its riveted together, as opposed to bolted - has anyone took a sealed unit apart before, is it as simple as
drilling out the rivets and re-rivetting it back together?
Any help would be greatly appreciated...
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Jon Ison
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| posted on 25/3/12 at 07:06 PM |
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I have just repacked mine, not an MK item but similar, drilled the rivets out repacked cut a M6 thread in place of rivets job done.
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Slimy38
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| posted on 25/3/12 at 07:18 PM |
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I've seen a fair few bike exhausts being repacked, you can just drill the rivets, pull the cap off and repack. I think for ease I'd
probably just re-rivet it rather than consider any way of reopening it. Unless you're planning on altering the packing on a regular basis?
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yellowcab
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| posted on 25/3/12 at 07:51 PM |
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Great advice guys, cheers.
Just been looking on eBay, as I'm unsure what my can actually is... I presume its a Busa item - but not necessarily true?
Its 20" long x 4.5" diameter, with a 2.75" inlet...
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yellowcab
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| posted on 25/3/12 at 08:42 PM |
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if anyone could help me identify the can too that would be a great help... am I right in thinking that changing from a 4.5" can to a 6"
can will be a wise move in order to make it quieter? (i.e.: could put more wadding inside?)
 
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mark chandler
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| posted on 25/3/12 at 10:07 PM |
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That looks like an aftermarket can, also the marks around the end show that it used to have a strap warpped around which probally was marked not for
street use 
Anyway, drill out the rivits, it should fall apart nicely.
A longer can if it's the same diameter and packed in the same way would be quieter.
Regards Mark
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Jon Ison
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| posted on 25/3/12 at 10:19 PM |
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If its quiet your after the longer you can and the larger diameter you can.
i repacked mine with this best stuff I have ever used, it so good I
thought I had a engine problem while out today, changing down at speed I could not here the engine at all, if your thinking track days then get it as
quiet as you can, mine used to be around the 105 mark, if the noise police where picky I often had to use a DB killer to get through the static test
though drive by it allways seemed ok, not been checked properly with a meter since re packed but if its much over 100 I will be surprised, I have seen
by ear anyway a dramatic drop in noise.
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yellowcab
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| posted on 25/3/12 at 10:19 PM |
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Longer but still 4.5" diameter you reckon?
I'm not overly sure what to look for, standard Hayabusa cans are cheap second hand but I don't know if it'll fit...
Any advice?
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yellowcab
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| posted on 25/3/12 at 10:21 PM |
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Fantastic Jon, after you said you had cents repacked yours, I did a search on your previous posts, and found that thread!!!
Love the sound of it, just unsure whether to get a larger and longer can to start with, of you get me, rather than spending money on this one...
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yellowcab
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| posted on 28/3/12 at 11:16 AM |
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Thanks to all you guys for your help and advice, I did the job yesterday, drilled out the rivets, removed the innards, removed the old tired wadding,
put some acousta-fil back in, and riveted it back up with a little bit of exhaust gum too to make the box airtight.
 
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MikeRJ
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| posted on 29/3/12 at 08:48 AM |
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Is the last shot with the can assembled? The wadding should all be behind the perforated tube; if there is a gap where the wadding is directly
exposed to the exhaust gasses it won't last long at all.
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yellowcab
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| posted on 29/3/12 at 10:09 AM |
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Hiya, thanks for the reply...
No it's not full assembled, it was still about 2 inches away from being sealed up in that last pic
It's all behind the tube now assembled :-)
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