Exhausts

[Spjallen]

Guys,
I'm planning on putting my exhausts underseat two into two but need some advise please. Can I simply use the original headers and fabricate two small link pipes? Some tech heads are saying I must make sure the total pipe lenghts are equal which would quite a fun task.
Help!!

[skidlids]

Simon there have been a few different under seat exhausts done over the years
Kev Palmers had a true 2 into 2 underseat setup a few years ago, without any link between the two pipes, He made it up himself using the original headers and then cut up a set of my old R6 header pipes to make the rest.

Om 4 Stroke 4 cylinder,pipe length can prove crutial so exhasut pulses don't interfere with each other, get the lengths right and they can aid the scavenging of the other cylinders, get it wrong and they can suck out the fresh incoming charge during valve overlap and hinder power

On a 4-stroke 2 cylinder its not as critical and I can;t see any real harm in keeping the two pipes seperate.
With regard to length, think of it as volumetric length, a shorter pipe with a larger diameter and equate to a longer pipe with a smaller diameter. if your trying to match back pressures
These days you can map each cylinder seperately so slight differences in exhaust can often be compensated for

[Spjallen]

Thank you Kev. Why did you do two into one? Is that better than two into two?

[Ghost]

Thank you Kev. Why did you do two into one? Is that better than two into two?

Its considerably lighter, more room to work with, also look at IL4's they are predominantly 4 into 1.

[bradders]

there is so much conflicting info and opinions on this, when senna kindly made one from bits I had last year I lost 6bhp, seems 2-1-2 works bset on a Ducati and most twins, altho the weight saving may offset the cpl bhp it adds...altho there are some 2-1 that are bang on the limit so who knows... :puzzled:

if it helps, I'm going thru the same. New bike has 2 high level cans and I know they will get in the way. SO choice is different link pipes and reposition them, or 2-1 and get it custom made

problem I have is I can neither do it myself nor have anyone local - every place recommended is miles away and even looking thru yellow pages its still 50+ miles to anyone who can do it

[Ghost]

The bike I bought came with a pair of Leo Vince Titanium cans. But I'm going down the same design route that I had on my 583, just different diameters. :cool:

[ells]

I am lucky to have a couple of exhaust places nearby. If I get time over winter then I may get a pair of link pipes made up that are a bit further back from the pegs.

Just depends on timing and wonga

M.
PS very envious of people with underseat exhausts. Gives them more room, and the ability to shift bits around.

[skidlids]

there is so much conflicting info and opinions on this, when senna kindly made one from bits I had last year I lost 6bhp, seems 2-1-2 works bset on a Ducati and most twins, altho the weight saving may offset the cpl bhp it adds...altho there are some 2-1 that are bang on the limit so who knows... :puzzled:



My bike runs a 2 into 1 using standard 900SS headers with the front cut before the splitter and then goes into a 2 into 1 coolector that is a direct copy of the standard 583 collector but in a larger diameter to suit the 40mm headers.
The collector was made by an exhaust specialist and all welds were gas purged giving a very smooth flow through the collector, where as Kew was trying to weld up a exhaust using three different stainless exhausts using Oxy Acetylene so god knows what it did for exhaust flow.

Dallas's 2 into 1 from 2010 also worked well, so much so that the can had to be changed to drag the max bhp down a bit while bumping up the mid range, His 2011 2 into 1 was pants.

A good exhaust is designed not just thrown together and Ducati spent a fair bit of time designing theres so its easy to make things worse but harder to find improvements, but as Ducati have to consider factors to do with mass production emmisions etc there is always room for improvement for a race exhaust

[bradders]

where'd dallas get the 2010 one done?

[skidlids]

I Can't recall as it was some time ago it was on his 583 the year before (2009) and is now fitted to a Class A bike I have part built. It doesn't fit the Monster otherwise I would have let him have it back last year when we found he was down on power, the chances are the Exhaust mods he made after his pre season engine build and dyno setup lost him more than 6bhp

[Spjallen]

Alan Parks had one custom made in Nottingham by Wayne Jackdon 2 into one. To be honest that's what got me going down this route as it looks fantastic, but the weight on the original non race cans are just amazingly bad. I'll find his number and post it on here later. I think he used Alans original headers and fabricated the rest. It cost £150 three years ago.

[skidlids]

Not this place by any chance
http://www.jacexhausts.co.uk/index.html

As listed in the sticky thread
http://www.ducatisportingclub.com/showthread.php?t=77817

[Spjallen]

Looks very likely!

[bradders]

and Alans bike was V fast so must know what they are doing

[steve41]

The system on my bike is a special that only Rattler and Chaz will know about, but Andy's bike is fitted with an NRP system, as are my classic bikes as he does a great job in ensuring maximum power and within noise restriction's.

Nigel Parker
01623 411191
nrpexhausts@hotmail.com
www.nrpexhausts.co.uk

[Jolley]

Alan Parks had one custom made in Nottingham by Wayne Jackdon 2 into one. To be honest that's what got me going down this route as it looks fantastic, but the weight on the original non race cans are just amazingly bad. I'll find his number and post it on here later. I think he used Alans original headers and fabricated the rest. It cost £150 three years ago.
They quoted me around £200 to do one about 6 months ago, with me providing 900 headers (which they said seem to work best)... but I sold the headers to Mr Appleby and lived with my 5bhp defecit.

[Spjallen]

Well I've got it sorted. Went to Wayne Jacksons in Notts. He was totally fantastic and I'm well happy. thanks for all the advise guys. When I work out how to do it I'll post some pics on here.

[dunlop0_1]

They quoted me around £200 to do one about 6 months ago, with me providing 900 headers (which they said seem to work best)... but I sold the headers to Mr Appleby and lived with my 5bhp defecit.

Yes you did Ron. I Never actualy used them, they got sold with the 620. However, Andy C had a set on his bike which I'm sure seemed to give him much more grunt than me.
R U racing next year?

[antonye]

However, Andy C had a set on his bike which I'm sure seemed to give him much more grunt than me.

They were 750/900SS headers, like these (be quick!!)
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=170728595582

[skidlids]

Well I've got it sorted. Went to Wayne Jacksons in Notts. He was totally fantastic and I'm well happy. thanks for all the advise guys. When I work out how to do it I'll post some pics on here.

Use the reply button on the left of the page near the bottom as it offers more options over using the quick reply buttons on the righ

One of the options is a manage attachments button, click this to open a window that allows you to add attachments including pictures

[skidlids]

They quoted me around £200 to do one about 6 months ago, with me providing 900 headers (which they said seem to work best)... .

I wonder why they think 900 headers work better on anything but a 583 Supersport as all Monsters already use a 40mm system and I thought the 620 Sport also used 40mm heades

[Iconic944ss]

Sorry for joining in late -Spaghetti headers always seemed to be rated well on the 900's but I've hardly heard of them being used on anything smaller?

I've also heard some claims that cutting the deflector plate out from within the collector 'box' helps midrange??

[Ghost]

My 583 system had standard diameter headers 35/36mm IIRC.