Date: 03-04-20  Time: 05:02 AM

Author Topic: shorten after market end can  (Read 854 times)

red98

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shorten after market end can
« on: 10 June 2019, 12:58:54 PM »
Been thinking about this for a while now , as we all know the standard  can is a bit bland , quite and heavy , I have a scorpion can which is a lot lighter but about the same length , with the baffle in its not much louder tham the standard one , with it out its way too loud , more or less straight through , which is great when I want to let off steam  :lol


so was thinking of drilling the rivits out and cutting a lump off  , shortening the baffle at the same time , my understanding is "the shorter the can the louder its going to be" not sure if this is correct or not but sounds good   :rolleyes




anyone done this before ?   How much do i cut off ? Or do i leave both of them on there   ;)
« Last Edit: 10 June 2019, 01:00:02 PM by red98 »
One, is never going to be enough.....

Oldgit

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Re: shorten after market end can
« Reply #1 on: 11 June 2019, 10:15:50 AM »

I see your bike does the can can then--maybe it's French.


Hedgetrimmer

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Re: shorten after market end can
« Reply #2 on: 11 June 2019, 10:52:00 AM »
I have a carbon Scorpion, and without the baffle the noise level is ok, doesn't grate on the nerves, passes MOTs.
I've always wanted to shorten the link pipe though, purely as a cosmetic thing.

VNA

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Re: shorten after market end can
« Reply #3 on: 11 June 2019, 06:48:54 PM »
 I have a round scorpion.  It sounds absolutely fine with the baffle out.
At low revs or rolling about town it’s very civilised.
When you open it up, and the EXUP opens up, it makes plenty of noise.
 

Dudeofrude

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Re: shorten after market end can
« Reply #4 on: 11 June 2019, 06:58:53 PM »
To answer your original post Red... just drill out the rivets, pull put the insides, chop it down to desired length, then chop down the inner tube (making sure to keep the part where the baffle screws in), re wrap it with fresh exhaust wadding and put it all back in then rivet the it all back together. I think the shortest 'road legal' exhausts are around 380mm but I'm sure plenty of people get away with shorter.
Obviously it will be a bit louder but that's the nature of the beast

VNA

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Re: shorten after market end can
« Reply #5 on: 11 June 2019, 07:13:19 PM »
I think the standard length looks right.

 Plus maybe if you shorten it too much you could effect back pressure, then other exhaust mysteries such as scavenging etc etc.
 

red98

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Re: shorten after market end can
« Reply #6 on: 11 June 2019, 07:26:28 PM »
Ooooo I have a saucy french fazer  :lol


never thought about the link pipe mr trimmer , not looked at the bike but wouldn't that cause clearence problems ?


thats strange VNA, baffle out on mine and It sounds as If its straight through , looks good on your bike but that could be the massive wardrobe making it look smaller than it is   :lol

thanks DUDE , nicly explained , dont want to go too short as iam not too keen on the stubby cans , was thinking of cutting enough off to leave the mounting strap in the middle of the can , always thought with the strap off centre it just didn't look right , might be me though...


wont get to look untill the weekend But i think i'll do a liitle at a time to see what difference it makes.....
One, is never going to be enough.....

Hedgetrimmer

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Re: shorten after market end can
« Reply #7 on: 11 June 2019, 07:49:20 PM »


never thought about the link pipe mr trimmer , not looked at the bike but wouldn't that cause clearence problems ?


Don't think so. Wouldn't achieve what you want of course though.

red98

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Re: shorten after market end can
« Reply #8 on: 11 June 2019, 07:50:58 PM »
No ....interesting though....
One, is never going to be enough.....

VNA

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Re: shorten after market end can
« Reply #9 on: 11 June 2019, 07:51:51 PM »
Quote
but that could be the massive wardrobe making it look smaller than it is   :lol

You mean my handbags. :)
Well for example I started mine up after work and it sounds almost stock.  Then one of my collegues came out and started his decatted fireblade sitting next to mine.  That was loud and I could no longer hear the thou.
Are you sure your exup is working OK?

red98

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Re: shorten after market end can
« Reply #10 on: 11 June 2019, 09:52:13 PM »
Yeh , exup good , gets serviced every year........I'll fit the scorpion saturday morning and take it for a spin , its been a while since ive used it.... :thumbup
One, is never going to be enough.....

robbo

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Re: shorten after market end can
« Reply #11 on: 12 June 2019, 07:43:08 PM »
Mr.Red,pm Flooky, he knows about cutting down cans.

Steve3351

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Re: shorten after market end can
« Reply #12 on: 12 June 2019, 11:26:08 PM »
How does this look...? :D

VNA

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Re: shorten after market end can
« Reply #13 on: 12 June 2019, 11:43:18 PM »
What have you done :eek No no no!

red98

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Re: shorten after market end can
« Reply #14 on: 13 June 2019, 06:39:45 AM »
Mr.Red,pm Flooky, he knows about cutting down cans.










cheers ROBBO    :thumbup
One, is never going to be enough.....

red98

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Re: shorten after market end can
« Reply #15 on: 13 June 2019, 06:46:00 AM »
Nice work steve  :thumbup ....thats more or less what i was thinking , the unknown to me is how much noise difference cutting x amount off makes , i'll use your picture as a guide scale wise and probably shorten it by half to start with.....dont want to end up with a shortenend can thats too loud   :o
One, is never going to be enough.....

Steve3351

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Re: shorten after market end can
« Reply #16 on: 13 June 2019, 06:16:09 PM »
ERK... have been pining for smart smaller exhaust can for some time.....purely for cosmetic reasons...the standard can seems to do a good job...
so can't justify buying new one....never occurred to me to cut the std one like u suggest....so rushed out with drill and angle grinder....only to find the mine is welded, not riveted. Back to pining and googling carbon fiber cans on Ebay :b

Steve3351

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Re: shorten after market end can
« Reply #17 on: 14 June 2019, 06:03:32 PM »
What have you done :eek No no no!

What hav I Done...!!!????  U turned yer bike into a VAN with all that luggage..... :'(

VNA

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Re: shorten after market end can
« Reply #18 on: 14 June 2019, 06:53:19 PM »
Ye cannae wack a top box or some panniers. :)
I mean what use is a bike if you cannae carry some odds and sods on it.

red98

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Re: shorten after market end can
« Reply #19 on: 16 June 2019, 10:04:08 AM »
Slipped the scorpion on this morning and took the baffle out , its not as loud as I remember , iam knocking on a bit now and I have problems with my hearing , parhaps thats what it is , so now its just a cosmetic thing , and I'll still have the choice of baffle in or out........Iam thinking more or less what STEVE has done to VNA 's bike , but I think I'll cut half of that off first to see the difference in noise levels......
« Last Edit: 16 June 2019, 10:14:51 AM by red98 »
One, is never going to be enough.....

red98

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Re: shorten after market end can
« Reply #20 on: 16 June 2019, 11:27:25 AM »
Back off again..........two lines on the can , shortening either by 140mm or 74mm , 140mm is what I would like ,74mm would give me a can lenght of 380mm , which may be the shortest "road legal" length , so I think the best place to start...


Cant find any BS mark on the can or "not for road use" ,only markings are on the "exit cap" but these look like model numbers to me and will be going back on......
One, is never going to be enough.....

red98

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Re: shorten after market end can
« Reply #21 on: 16 June 2019, 12:53:35 PM »
Drilled the rivets using a 4mm drill . No problem , both end caps are an extremely snug fit with a small amount of sealent on them , lots of pulling , twisting and swearing and I managed to ease them out without any damage...


was a bit of a struggle getting the end caps out so I might just go the whole hog and chop the 140mm off.....


time for tea I think   ;)
« Last Edit: 16 June 2019, 12:56:28 PM by red98 »
One, is never going to be enough.....

red98

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Re: shorten after market end can
« Reply #22 on: 16 June 2019, 04:00:23 PM »
Chop, chop   :eek
« Last Edit: 16 June 2019, 04:01:13 PM by red98 »
One, is never going to be enough.....

red98

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Re: shorten after market end can
« Reply #23 on: 16 June 2019, 07:37:35 PM »
Cut the centre tube down by the same amount and re-assembled , re-bored the end cap rivet holes and dug out my rivet gun only to find it jammed solid  :\ ......too late on a sunday to go shopping and with both end caps a very nice snug fit i put it back on the bike......theres not a lot of difference with the baffle out , expected , with the standard length baffle in its a little bit louder but a lot more fruity  :thumbup .......i might still shorten the baffle but its not going to need much taking out....happy with the way it looks apart from the colour....anyone wrapped a can before  ?
« Last Edit: 16 June 2019, 07:38:56 PM by red98 »
One, is never going to be enough.....

Dudeofrude

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Re: shorten after market end can
« Reply #24 on: 16 June 2019, 08:37:12 PM »
Looks loads better red, I did wonder why you didnt cut the purple end off though instead of the badged side Haha
You would have ended up with a silver can with the scorpion badge still on it?
But hindsight and all that Haha

Wouldnt say you could vinyl wrap a pipe, it gets too hot?
Maybe powder coating could possibly work?