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Old 09-02-2009, 04:53 AM   #1
Gimme 2 OP
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Laugh 990 Stock Pipe Metamorphasis .

The object is to remove all the crap (cat baffel and second wall) shorten the pipe , fit a stainless perforated inner tube wrapped in appropriate wool and make it servicable useing rivets.

I hope to lose half the weight , plus help the big twin breath easier in mid and top revs, the sound will be good the cost should be meagre and i'll have some fun doing the work and bringing the results to fellow 990 owners.


The bike, you've maybe seen one.



The weight and height of 1 original pipe.


Tools for first stage- dissection.


The first cut.


1


2 Meow!


3 Cat cut from flange and weighed.



4 Cut end cap .


5 and take a looksie.

6 impressive build.

7 slip the outer from the inner.

8

9 baffel me cat diet perhaps?
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Old 09-02-2009, 07:04 AM   #2
Vicks
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Good efforts going in there.

I am myself in the process of converting to a 2-into-1 setup using an HT-Racing Y pipe with FMF can. I initially had this idea of doing a de-catting & 2-into-1 conversion using the stock cans.

The stock exhaust & H-pipe setup weighs 10Kgs and the HT-R 2-into-1 setup weighs 3Kgs !!! So it was much better than my earlier idea and bcos i am keeping the rear luggage carrier frame on the bike, i don't need the additional crash protection of the stock cans (very strongly built - but i don't know how much it will be compromised by removing the innards).

cheers
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Old 09-02-2009, 04:05 PM   #3
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I like the way you have the timer running in the pics, so we know you aren't cheating.

Good so far, keep going!
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Old 09-02-2009, 04:29 PM   #4
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I like where this is heading, keep it up....

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Old 09-02-2009, 10:58 PM   #5
brents347
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There's a continuity error in pic- 3 cat cut and weighed. The clock shows zero! That's it, weld it up and start over!
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Old 09-03-2009, 01:14 AM   #6
Gimme 2 OP
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Quote:
Originally Posted by brents347
There's a continuity error in pic- 3 cat cut and weighed. The clock shows zero! That's it, weld it up and start over!

yes , i am aware of this . but to be honest the whole deal took about 100 minutes of leisurely time. That's both pipes .
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Old 09-03-2009, 01:18 AM   #7
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Thumb

I had a chance to drop the pipes off at the tig welder today. And let me say i have a good feeling about his skills, clean workshop , just him there on his own , and he loves racing.

Stay tuned!
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Old 09-03-2009, 04:44 AM   #8
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Quote:
Originally Posted by Gimme 2
I had a chance to drop the pipes off at the tig welder today. And let me say i have a good feeling about his skills, clean workshop , just him there on his own , and he loves racing.

Stay tuned!
OK Gimme so what have you left in the can's? Baffels or just the centre pipe or both?
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Old 09-03-2009, 04:54 AM   #9
Gimme 2 OP
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There is only a hollow tube at the moment. Like the one in pic 8, lying down.
the stuff in pic 9 is going in my recycle bin.

I am going to $ buy an exhaust grade stainless steel perforated 1and half inch tube, then wrap it in glass wool.

It's friday tomoz, so maybe have something then ,but only if i'm lucky.
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Old 09-03-2009, 05:24 AM   #10
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Great Idea! Do you plan on incorporating a spark arrestor?
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Old 09-03-2009, 05:53 AM   #11
charlie264
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Quote:
Originally Posted by Gimme 2
There is only a hollow tube at the moment. Like the one in pic 8, lying down.
the stuff in pic 9 is going in my recycle bin.

I am going to $ buy an exhaust grade stainless steel perforated 1and half inch tube, then wrap it in glass wool.

It's friday tomoz, so maybe have something then ,but only if i'm lucky.
Sorry mate. Let me get this right, you're scrapping the inner sleave and baffels seen in pic 5 and keeping the centre tube resting on your left hand in pic 5 and then your going to put a another perforated tube inside the centre pipe with wodding on it?
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Old 09-03-2009, 06:14 AM   #12
Gimme 2 OP
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Quote:
Originally Posted by charlie264
Sorry mate. Let me get this right, you're scrapping the inner sleave and baffels seen in pic 5 and keeping the centre tube resting on your left hand in pic 5 and then your going to put a another perforated tube inside the centre pipe with wodding on it?



I'll spell it out ...........



I've kept , the end cap and thats the skin only of the end cap. No tubes perforated steel or glass wool.

Right... ive also kept the flange end , SKIN ONLY.

And the tube lying down in pic # 8 which is the external skin only that is visible to the eye.

NOW, the skin of the original can (minus the end cap and the bolt on flange) has been shortened, by about 50 mm.


This piece (the 50 mm piece )is going to be used as a insert, which is being welded to both the flange and end cap.


Ive had to cut a piece out of the radius of this 50 mm piece in order for it to fit inside the original can skin.

On top of this above foundation i am adding.............a 1 and half inch in dia perforated ss tube.

This tube will connect the bolt on flange to the end cap creating a straight thru pipe...yes!!

The perf pipe will be wrapped in exhaust glass wool wadding or apropriate material.



There...... clear as mud!



Be patient pics will explain more.

Gimme 2 screwed with this post 09-03-2009 at 06:32 AM
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Old 09-03-2009, 06:18 AM   #13
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Quote:
Originally Posted by riceless950
Great Idea! Do you plan on incorporating a spark arrestor?
I think i should. Bushfires and all.

a DB killer for certain.

Termimesh should work for the Spark police.
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Old 09-03-2009, 06:33 AM   #14
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Quote:
Originally Posted by Gimme 2
I'll spell it out then...........



I've kept , the end cap and thats the skin only of the end cap. No tubes perforated steel or glass wool.

Right... ive also kept the flange end , SKIN ONLY.

And the tube lying down in pic # 8 which is the external skin only that is visible to the eye.

NOW, the skin of the original can (minus the end cap and the bolt on flange) has been shortened, by about 50 mm.


This piece (the 50 mm piece )is going to be used as a insert, which is being welded to both the flange and end cap.


Ive had to cut a piece out of the radius of this 50 mm piece in order for it to fit inside the original can skin.

There clear as mud!
Nope. wish you had taken a photo.

So the can you've sent to the weld shop has zilch in it. Its just an empty can? Its going to run like shit, zero back preasure.
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Old 09-03-2009, 06:40 AM   #15
Gimme 2 OP
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Quote:
Originally Posted by charlie264
Nope. wish you had taken a photo.

So the can you've sent to the weld shop has zilch in it. Its just an empty can? Its going to run like shit, zero back preasure.

Oh Charlie Charlie Charlie bloody go for a ride or something and get some fresh air outside your head!
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