Board logo

Bike carbs to crossflow inlet manifold pipes
Roman - 18/11/08 at 04:33 PM

Bend or cut and weld?

Crossflow engine with unspaced CBR600 carbs, pipe is mild steel.

Do I try and bend them or cut and weld them to get the correct angles, etc?

If bend, what is the best way of bending 1 5/8" mild steel pipe without distorting it?

jacko - 18/11/08 at 04:46 PM

Weld
Hi have a look in my photo archives
under zx9r carbs & manifold
Jacko

Roman - 18/11/08 at 04:51 PM

quote:
Originally posted by jacko
Weld
Hi have a look in my photo archives
under zx9r carbs & manifold
Jacko


Been looking at your photos for sometime now, they have been giving me ideas leading up to me finally making the decision to go down the bike carb route. Thanks

jacko - 18/11/08 at 04:59 PM

Go for it it's not hard if you can weld
Im glad you like my manifold
Graham

mcerd1 - 18/11/08 at 05:06 PM

my alloy manifold (bogg brothers) is cut and welded:
http://s5.photobucket.com/albums/y170/mcerd1/Dax/IMG_3947.jpg
http://s5.photobucket.com/albums/y170/mcerd1/Dax/IMG_3948.jpg

jacko - what are the things with the wires on the bottom of your carbs ? and why don't mine have them ??
(mine are also CVR's from a ZX9R)

[Edited on 18/11/08 by mcerd1]

Memphis Twin - 18/11/08 at 05:42 PM

quote:
Originally posted by jacko
Weld
Hi have a look in my photo archives
under zx9r carbs & manifold
Jacko


I like it better with the SUs

will121 - 18/11/08 at 08:21 PM

Ive respaced my carbs so only had to bend in one plane, but just cut the tube to form a V nearly all the way through then bent it and welded the joint as seemed easier than clamping loose sections together and welding.

MikeRJ - 18/11/08 at 11:02 PM

quote:
Originally posted by will121
Ive respaced my carbs


By far the best idea. Some of the manifolds I've seen for unspaced carbs have had very sharp bends in the outer runners, not ideal for a performance upgrade.

David Jenkins - 19/11/08 at 08:53 AM

I've also respaced my CBR600 carbs - if you click on the WWW link below, and click on the 'bike carbs' menu item, then you'll see what was involved. There's no reason why the inlet manifold couldn't be made of steel, instead of the ali I used.

[Edited on 19/11/08 by David Jenkins]

Roman - 19/11/08 at 09:14 AM

quote:
Originally posted by David Jenkins
I've also respaced my CBR600 carbs - if you click on the WWW link below, and click on the 'bike carbs' menu item, then you'll see what was involved. There's no reason why the inlet manifold couldn't be made of steel, instead of the ali I used.

[Edited on 19/11/08 by David Jenkins]


Book marked your website along time ago David very useful, 1 of the reasons I went for the same carbs.

I don't have the tools/skills/money required to respace the carbs, so trying to do it without.

Thanks for all your comments I think I will try the cut and shut method.

I will keep you posted.

jacko - 19/11/08 at 05:42 PM

quote:
Originally posted by mcerd1
my alloy manifold (bogg brothers) is cut and welded:
http://s5.photobucket.com/albums/y170/mcerd1/Dax/IMG_3947.jpg
http://s5.photobucket.com/albums/y170/mcerd1/Dax/IMG_3948.jpg

jacko - what are the things with the wires on the bottom of your carbs ? and why don't mine have them ??
(mine are also CVR's from a ZX9R)

[Edited on 18/11/08 by mcerd1]


Hi the thing's with wires are cut off solenoids for when you drop the bike
my carbs are of a continental bike


Just one thing if you re space the carbs to fit a pinto and still have a dizzy the carbs may not fit
Jacko