2 into 1 exhaust ? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 01-05-2007, 06:24 AM Thread Starter
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Cool 2 into 1 exhaust ?

Has any one made a 2 into 1 exhaust for there vn ? i would like to try .


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post #2 of 6 (permalink) Old 01-06-2007, 01:54 PM
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I have thought about it. Started to do some work, but since i lack the access to a welder gave up on it untill a lil later in life. A few things to keep in mind if you've never built a tuned exhaust system. 2-1 systems can produce large gains for a set of pipes, but poorly designed units can also subtract significantly as well. the stock pipes are very well tuned for what they are.

Also keep in mind the engine. the engine is odd fire. the cyls dont fire 180/360 degs apart so adjustments will need to be made where your pipes meet in order to keep them from pressurizing the other cyl on the exhaust stroke. Also dont forget the exhaust timing... i havnt been able to figure out what our bikes duration and when exactly it happens. But if you do figure it out all the power to ya and clue us in!!!

as for parts, i was going to use pre-mandrel-bent pipes, and bandsaw cut them (to get a good mating surface), and have them tig welded together. then you can clean the welds, re weld and clean again. then you can check for leaks (best thing is prolly cap it and fill with water or pressure test it if u can) if all is good, clean the pipes and they are ready for chroming/paint/headder wrap if you want it. I was originally gonna create heatsheilds for mine, and wrap the pipes below with headder wrap as it keeps the exhaust gasses hot and moving fast. if you do this, keep it in mind in your design.

'04 Vn750
Currently Installed
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westco 12v30 MF, 30A/h w/ 350 CCA's w/ custom box
TOC stator cover w/ Frankenstator mod!
R/R relo

Soon to have (own or on order)
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Custom rear fender and tail light
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post #3 of 6 (permalink) Old 01-11-2007, 05:22 AM Thread Starter
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wow i have not thought about any of this , i figured the goats belly is like a cross over , so why wouldn,t a 2-1 work . some people put an " H " pipe in place of the goat , if there was going to be a timing problem wouldn't those people have a problem ?
my plan is to get two 45 degree pipes , and a flex pipe for the center , then i would like to use a BSA bullet pipe . The right pipe would enter the left pipe at a 45 degree angle hmmmm
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post #4 of 6 (permalink) Old 01-11-2007, 03:16 PM
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differences in power gained and lost isnt as high with an "H" pipe b/c all it does is equalize the pressure between the pipes, a 2-1 purpose is to scavange the open cyl of all the exhaust it can....

i dont recomend the flex pipe b/c it will slow down the gas, reducing the effect of the scavanging. keep in mind exhause can be the difference between 5-10 hp and charateristics of the engine.... if you are just going for looks, well that is a different story, sound will change too.

'04 Vn750
Currently Installed
nat'l cycle deflector shield
westco 12v30 MF, 30A/h w/ 350 CCA's w/ custom box
TOC stator cover w/ Frankenstator mod!
R/R relo

Soon to have (own or on order)
TOC ACCT's
Mez's 110-FRT 170/80-Rear
Custom rear fender and tail light
Givi hard bags w/ custom rear turn signals


Band Engineer/Webmaster for Josey Contreras Tejano Band

Last edited by Hizzo3; 01-11-2007 at 03:19 PM.
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post #5 of 6 (permalink) Old 01-12-2007, 01:02 PM
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there are some after-market pipes which bring both pipes out the right hand side one of these could quite easily be adapted in two a 2-1.all the bends are there one just comes out a few inches above the other, cut it move it down or up and weld. its worth a try, if the power is the same or better 'bonus'. if it is a little less this can be offset by the 'grin factor'(currently rated at 68.56%) (as mentioned in other threads) which is gained by having the only one,the first one,or one you made yourself.
GOOD LUCK,AND KEEP THE IDEAS COMING.

BEST OF HEALTH AND HAPPYNESS
EDALBRIS

1952 NORTON (MODEL ONE) 'BIG 4'
1955 NORTON DOMINATOR 88/99 CAFE RACER
1981 KAWASAKI Z1000ST SHAFT
1988 KAWASAKI VN750 (UK) HARDTAIL + 5"
1988 KAWASAKI VULCAN 750 (US)

ALL TIME WISHLIST BIKES
1939 BROUGH SUPERIOR SS100 GRAND ALPINE SPORT
ANY 1940ish NORTON WITH CS1 ENGINE
A RIDE ON A NORTON NEMISIS 'A'
NEVER HAD A CAR LICENCE AND HOPFULLY NEVER WILL
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post #6 of 6 (permalink) Old 01-12-2007, 03:04 PM
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I didnt mean to discourage you in anyway, i am just saying you need to do your homework so you can get the most from it. if your already gonna spend 10 hours building it, might as well spend an extra 2-3 to make sure you get more then just grin factor. :P its not impossiable, and would be quite easy with google once you find the cam specs and so on....

'04 Vn750
Currently Installed
nat'l cycle deflector shield
westco 12v30 MF, 30A/h w/ 350 CCA's w/ custom box
TOC stator cover w/ Frankenstator mod!
R/R relo

Soon to have (own or on order)
TOC ACCT's
Mez's 110-FRT 170/80-Rear
Custom rear fender and tail light
Givi hard bags w/ custom rear turn signals


Band Engineer/Webmaster for Josey Contreras Tejano Band
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