mikeb
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| posted on 9/6/08 at 11:28 AM |
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Making an Inlet Manifold
just lost the last post I put up so sorry if this comes up twice!
I need tips on making an inlet for Zetec to Zx9r carbs
1. How do I respace the carbs (this will make fabricating the manifold a lot easier).
2. Laser cut manifold plate £20?
3. what size tube have people used and where did they get it?
4. Oval to circular, what the best method (squeeze in a vice?)
5. What if the tubing ends up a larger dia than the carbs, can this be taken up by the flexible carb connectors (what are they called, where do I get
them). I'm sure when I did a quick measure the effective dia of the oval was larger than the carb inlet dia??
Any tips or detailed guides, or help sourcing parts greatfully received.
thanks in advance
A skint Mike B
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whitestu
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| posted on 9/6/08 at 11:39 AM |
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For an ultra cheap solution, just bolt the standard bike carb rubbers to an ali plate.
That's what I did and so far it works really well.
Pic
 
inlet manifold
I had my carbs respaced by someone on here [ZX6R carbs]. It looks pretty easy to do. You just need to extend the fuel rail, make up some tube spacers
and use threaded rod to repace.
The connection tabs between the carbs need extending too.
Stu
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tim windmill
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| posted on 9/6/08 at 01:11 PM |
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This is what we did to make a manifold and respce R6 throttle bodies
1. How do i respace the carbs? 6mm threaded bar and cut some tubular spacers
2. laser cut steel manifold plate ? yes
3. what size tube? 48mm outside dia, 44mm internal (source not known but looks like exhaust tube)
4. what method from oval to round? squeeze in vice
5 used short lengths of rubber with jubilee clips to fix to manifold, this will allowfor slight diference in size of carbs to manifold.
there are a couple of pictures in my photo archive
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David Jenkins
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| posted on 9/6/08 at 02:07 PM |
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If you go to my web page (link below) and open the page on bike carbs, you'll see how I spaced my carbs, and how I made an inlet manifold.
As usual I did things the hard way, requiring the services of a top-notch welder (nice Mr 907  ) - there's no reason why it couldn't
have been made of steel and welded, or even brazed.
You could even make it of plastic, if you could get hold of suitable materials and adhesives.
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andrew-theasby
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| posted on 9/6/08 at 05:47 PM |
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Aluminium stageing/scaffolding seems to come up in 48x4 size, thats where mine is from if that helps. Check 48mm is the size you require tho, it was
perfect for me.
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mikeb
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| posted on 9/6/08 at 10:40 PM |
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would be good if I could weld ali!
My MIG says it can do it, I'm not so sure!!
Thanks for all the tips, splitting the carbs seems nice but I haven't got a lathe to make the spacers etc.
Will debate for a bit longer
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