Re packing an exhaust
Discussion
I've finally got a bit fed up with the rattling coming from the rectangular box in my exhasut and decided to have a bit of an investigate.
I've removed it and cut out a rectangle from the top face using the angle grinder, about 5mm in from the edge to give something to weld back to.
Photos to follow, but inside is a section of baffle plate, which runs front to back in a sort of sine wave pattern. Above this is a sort of fibrous wadding material. The silencer only had this wadding in the front and back of the box...the central 12" or so was empty.
I expected to find a loose baffle in there but it looks solidly attached. I'm guessing the noise could be from the lack of wadding in there.
Does anyone know where to get this sort of stuff please, or should I just be daring and leave it all out?? Also, does the front oval section do much...I can se what looks like 2 runs of perforated pipe in there, but not sure if they have packing in as well.
Cheers
ant
I've removed it and cut out a rectangle from the top face using the angle grinder, about 5mm in from the edge to give something to weld back to.
Photos to follow, but inside is a section of baffle plate, which runs front to back in a sort of sine wave pattern. Above this is a sort of fibrous wadding material. The silencer only had this wadding in the front and back of the box...the central 12" or so was empty.
I expected to find a loose baffle in there but it looks solidly attached. I'm guessing the noise could be from the lack of wadding in there.
Does anyone know where to get this sort of stuff please, or should I just be daring and leave it all out?? Also, does the front oval section do much...I can se what looks like 2 runs of perforated pipe in there, but not sure if they have packing in as well.
Cheers
ant
If you leave out the wadding you'll get a lot of noise (most of you like that) but it will resonate in the cabin a lot. I noticed that just repacking the rectangular box made the cabin quieter.
Later on I had a rattle and it was coming from the perforated tube in the oval section. The perforated tube had split and I ended up cutting it open and removing it. THere was no wadding left in mine in the oval section. Now that the oval box is empty it really does resonate and is unbearable on heavy throttle loads. I'd recorded over 104db in the cabin and that was what I felt was a quiet day. I think it would be better to replace he oval with 2 x 2" pipes and make a removable lid on the rectangular section.
Wadding should be available from any motorbike shop... must dash, the GF wants to go out.
J
Later on I had a rattle and it was coming from the perforated tube in the oval section. The perforated tube had split and I ended up cutting it open and removing it. THere was no wadding left in mine in the oval section. Now that the oval box is empty it really does resonate and is unbearable on heavy throttle loads. I'd recorded over 104db in the cabin and that was what I felt was a quiet day. I think it would be better to replace he oval with 2 x 2" pipes and make a removable lid on the rectangular section.
Wadding should be available from any motorbike shop... must dash, the GF wants to go out.
J
Anthony
Exhaust/Silencer Wadding is available from many motorsport suppliers.
Try these - Merlin Motorsport, Car Builder Solutions or even on E-Bay.
I have never had to repack a silencer before, so good luck and let us know how you get on.
Pete
Exhaust/Silencer Wadding is available from many motorsport suppliers.
Try these - Merlin Motorsport, Car Builder Solutions or even on E-Bay.
I have never had to repack a silencer before, so good luck and let us know how you get on.
Pete
Edited by T' Veteran Racer on Sunday 9th August 11:06
Thanks chaps
After a little bit more surgery, I have found out the cause of the problem. The front oval section has a perforated tube with wadding around it. The perforated tube had cracked and was moving about, and about half of the wadding was missing.
It's taken a bit of angle grinder work to get it open, but now I plan to put in a new perforated section...welded in nummerous places to top and bottom "covers" so it can't rattle about, re pack both boxes and then weld on new sections. I reckon about £30 in bits should do the trick. (plus a few hours welding when I can borry a mates TIG)
Need to go and find the parts, but I'll keep you posted to know if it works...worth a shot though..
Cheers
Ant![](http://thumbsnap.com/sc/pDalWFmF.jpg[/img]</a> <a href="http://thumbsnap.com/v/xof9QZoR.jpg" Target="_blank">[img]http://thumbsnap.com/sc/xof9QZoR.jpg)
After a little bit more surgery, I have found out the cause of the problem. The front oval section has a perforated tube with wadding around it. The perforated tube had cracked and was moving about, and about half of the wadding was missing.
It's taken a bit of angle grinder work to get it open, but now I plan to put in a new perforated section...welded in nummerous places to top and bottom "covers" so it can't rattle about, re pack both boxes and then weld on new sections. I reckon about £30 in bits should do the trick. (plus a few hours welding when I can borry a mates TIG)
Need to go and find the parts, but I'll keep you posted to know if it works...worth a shot though..
Cheers
Ant
I repaired my exhaust a while ago. The front oval section has losts of bit of remains of perforated tubes. These were duely removed and the front oval section is now completely empty.
The main square section box was opened and found to be as good as empty, all the wavey perforated plate has disintegrated and now wadding. I found enough perforated steel to replace about 1/2 of the wavey section. This was padded with loft insulation, and the exhaust welded back together.
Initially the exhaust eas quieter than before, due to the wadding in 1/2 of the square box, but either I have got used to it, or the loft insulation has blown away as it seems nice and noisy again now.
I have pictures of the open exhaust and the repacked exhaust pior to welding shut again if it helps you.
Pete
The main square section box was opened and found to be as good as empty, all the wavey perforated plate has disintegrated and now wadding. I found enough perforated steel to replace about 1/2 of the wavey section. This was padded with loft insulation, and the exhaust welded back together.
Initially the exhaust eas quieter than before, due to the wadding in 1/2 of the square box, but either I have got used to it, or the loft insulation has blown away as it seems nice and noisy again now.
I have pictures of the open exhaust and the repacked exhaust pior to welding shut again if it helps you.
Pete
Gassing Station | S Series | Top of Page | What's New | My Stuff