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mainstone41
Joined: 02 Mar 2012
Posts: 132
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 Posted: Thu Aug 16, 2012 9:41 pm Post subject: Loud exhaust? |
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Hi guys
I have a standard spare set of exhaust cans and was wondering if anyone has had them apart to free the flow up and make them louder, if so any better and worth doin..? |
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oily
Joined: 05 Apr 2008
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Location: worcestershire
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| Posted: Thu Aug 16, 2012 10:21 pm Post subject: |
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Yes and yes 
Requires a small amount of welding and fabrication.
In fact, I shall be doing it again in the near future
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Evilchicken0
Joined: 12 May 2010
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| Posted: Fri Aug 17, 2012 9:28 am Post subject: |
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Adds nothing (or very little) to performance though.
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oily
Joined: 05 Apr 2008
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Location: worcestershire
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| Posted: Fri Aug 17, 2012 9:42 am Post subject: |
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| Evilchicken0 wrote: |
| Adds nothing (or very little) to performance though. |
Really?
If that's the case why were race pipes produced and why aren't race pipes baffled like the road pipes?
I think turning the road cans into "straight through's" is always going to help the engine breath
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mainstone41
Joined: 02 Mar 2012
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| Posted: Fri Aug 17, 2012 10:52 am Post subject: |
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| Not to bothered about out right bhp but easier breathing and LOADER is what im wanting! lol Much loader! And plod would struggle as standerd silencers fitted. Ha ha |
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oily
Joined: 05 Apr 2008
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Location: worcestershire
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| Posted: Fri Aug 17, 2012 11:27 am Post subject: |
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The limit to noise is the small bore end caps
If you want LOUD your gonna need bigger holes in the end
Whilst your having some big bore end caps made, I need a couple too
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Evilchicken0
Joined: 12 May 2010
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Location: London
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| Posted: Fri Aug 17, 2012 2:00 pm Post subject: |
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| oily wrote: |
| Evilchicken0 wrote: |
| Adds nothing (or very little) to performance though. |
Really?
If that's the case why were race pipes produced and why aren't race pipes baffled like the road pipes?
I think turning the road cans into "straight through's" is always going to help the engine breath |
On the six the difference between the race cans and normal road cans is only a couple of hp so I'd say the road cans are as "good". It's true though the louder can sound .... better, they have a lower tone and are different internally to the standard cans.
The race pipe don't have the outer cage the road pipes have and so you can get more wadding into them. I did run these with no wadding before but they were stoooopid loud. I'm not these would be ok for a trackday but they're a lot better for the road than they were. I guess I should get them tested sometime.
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mainstone41
Joined: 02 Mar 2012
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| Posted: Fri Aug 17, 2012 4:51 pm Post subject: |
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| Think i may get the drill out in the next couple of days and take a look in side ..? |
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Evilchicken0
Joined: 12 May 2010
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| Posted: Sat Aug 18, 2012 11:28 am Post subject: |
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Race cans are the blue trace
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oily
Joined: 05 Apr 2008
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| Posted: Sat Aug 18, 2012 11:45 am Post subject: |
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What engine was that on Boris because with or without race cans.....that's crap 
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mainstone41
Joined: 02 Mar 2012
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| Posted: Sat Aug 18, 2012 6:01 pm Post subject: |
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| Hold up dont think i need to take the spare set apart cos just looked over the pipes on the bike and they have no lower baffle bulge and have written on them "Competizioni" Happy days, thats made my bloody day!! Yay!! lol |
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Evilchicken0
Joined: 12 May 2010
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Location: London
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| Posted: Sat Aug 18, 2012 8:01 pm Post subject: |
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| mainstone41 wrote: |
| Hold up dont think i need to take the spare set apart cos just looked over the pipes on the bike and they have no lower baffle bulge and have written on them "Competizioni" Happy days, thats made my bloody day!! Yay!! lol |
You're sorted then 
That was the engine after the first rebuild
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stockcar
Joined: 07 Apr 2011
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Location: in the shadow of the "angel"
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| Posted: Sun Aug 19, 2012 1:51 pm Post subject: |
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| bear in mind that you need more than simply an open pipe for a 4stroke to work correctly, no back pressure will mean a very poorly power output |
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oily
Joined: 05 Apr 2008
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Location: worcestershire
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| Posted: Sun Aug 19, 2012 2:10 pm Post subject: |
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Absolutely right Alyn but the object here is......
| mainstone41 wrote: |
| Not to bothered about out right bhp but easier breathing and LOADER is what im wanting! lol Much loader! And plod would struggle as standerd silencers fitted. Ha ha |
.....and the bigger the hole in the end etc. etc........
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SB6 mk1 (project mega light, big bore)
Sb6 mk2 ( Big Bore)
Sb6 mk2 ( Restored)
Sb6R fighter
Sb6 or Sb7 WANTED |
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Evilchicken0
Joined: 12 May 2010
Posts: 2996
Location: London
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| Posted: Sun Aug 19, 2012 4:55 pm Post subject: |
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| stockcar wrote: |
| bear in mind that you need more than simply an open pipe for a 4stroke to work correctly, no back pressure will mean a very poorly power output |
Not quite a bigger pipe will give you less back pressure allowing higher revs and therefore more power.
But a smaller diameter will increase back pressure giving more torque
Hence the Yamaha's EXUP system.
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