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Home > Help Needed / General Tech Chat > weber carb for boost

carl talbot

326 Posts
Member #: 1323
Senior Member

17th Feb, 2012 at 06:06:30pm

Can anyone suggest a downdraught weber for a low boosted [5-8psi] 1200cc motor

Are all weber carbs ok to use with low boost
or do they need seals , float chamber etc changing

wil_h

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9258 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

17th Feb, 2012 at 07:19:47pm

You need to search, this has been discussed several times.

As I said in my other post, whay do you want to use a webber over a HIF44?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


carl talbot

326 Posts
Member #: 1323
Senior Member

17th Feb, 2012 at 07:38:20pm

I did search - but can't find [ I don't get much joy with my searches ?]

the R5 gt is a solex

The reason why is this -

http://www.ebay.co.uk/itm/270914768977?ssP...9#ht_500wt_1413

Its for a my Sidevalve Ford 100e which I'm fitting an Eaton45 to with a dummy SU pre charger as a primary choke
I have modified a Metro turbo manifold to fit the Ford Siamese ports

But the above item is just tooo cool


Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

17th Feb, 2012 at 07:47:09pm

somthing like this should be not to hard to convert I think.

http://www.ebay.co.uk/itm/Ikov-Twin-Choke-...=item2ebb3690fc

the trouble you will have is most downdrafts the buterflys open one after the other, so you will get unequal flow on that manifold.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

17th Feb, 2012 at 07:54:53pm

http://www.scuderiatopolino.com/generalcat...d.php?id_area=6

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



carl talbot

326 Posts
Member #: 1323
Senior Member

18th Feb, 2012 at 05:29:45pm




On 17th Feb, 2012 Joe C said:
somthing like this should be not to hard to convert I think.

http://www.ebay.co.uk/itm/Ikov-Twin-Choke-...=item2ebb3690fc

the trouble you will have is most downdrafts the buterflys open one after the other, so you will get unequal flow on that manifold.



Thanks Joe

Still can't get any joy with the search feature

Anyone have any experience
Could I get away with boost referencing the float chamber and leaving the rest of the Weber standard ?
I'm not planning on more than about 8psi boost max


Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

18th Feb, 2012 at 05:34:44pm

you might get a bit of fuel leakage from the throttle spindles, i'd try it and see...

if it does leak i would think that you can put an o ring on the outside, then a washer to press against the oring, then a spring. thats my plan for my bike throttles anyway.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



carl talbot

326 Posts
Member #: 1323
Senior Member

18th Feb, 2012 at 06:59:28pm




On 17th Feb, 2012 Joe C said:

the trouble you will have is most downdrafts the buterflys open one after the other, so you will get unequal flow on that manifold.


have checked - its a normal twin choke manifold with common chamber feeding each port
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