Classic cars forum & vehicle restoration.
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Ittagub
Joined: 10 Nov 2016 Posts: 2
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Posted: Thu Nov 10, 2016 11:35 am Post subject: Updraught Zenith carb setup questions |
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Hello,
Currently I am trying to get an updraught zenith to work propperly.
About the carb.
It is an US bronze zenith reportetly from 1910. diameter at the butterfly 54 mm !!
It has a powervalve which is actuated through a mechanism at the butterfly axle. This mechanism can be adjusted.
Venturi 44 mm. There is also a smaller secondary venturi around the "double tubes"
At this moment suction jet 190, constant jet 170, power valve 90
I am familiar with the idea of this sort of carbs. It has a constant flow circuit and a "suction" flow circuit.
The power valve feeds into the constant flow circuit.
I have a lamba meter in the exhaust and am getting some idea whether I should use smaller or bigger jets.
My problem: air/fuel mix is going in all directions under accelerating and different speeds. Testing on the road is a bit difficult because I am living in a densely populated area.
Should the jets for the two circuits be of approximatly the same size? Or should they be of different size?
Any recommendations about the moment the power valve is opening in relation to the opening angle of the butterfly and jet size?
Hope for some advise
Thanks
Lex |
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Penman
Joined: 23 Nov 2007 Posts: 4756 Location: Swindon, Wilts.
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Posted: Thu Nov 10, 2016 1:24 pm Post subject: |
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Hi
Don't know if this will help or not, but starting on this page there is quite a lot of explanation about Zeniths.
http://old-carburetors.com/1927-Dykes/1927-Dykes-061.htm
The page advance is just above the image of the original page. _________________ Bristols should always come in pairs.
Any 2 from:-
Straight 6
V8 V10 |
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Ittagub
Joined: 10 Nov 2016 Posts: 2
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Posted: Thu Nov 10, 2016 2:27 pm Post subject: |
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Page seems not to be existant |
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Penman
Joined: 23 Nov 2007 Posts: 4756 Location: Swindon, Wilts.
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Posted: Thu Nov 10, 2016 3:17 pm Post subject: |
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Hi
Opens all right for me.
I've tried it on IE, Chrome and Firefox they all work _________________ Bristols should always come in pairs.
Any 2 from:-
Straight 6
V8 V10 |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22446 Location: UK
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Peter_L
Joined: 10 Apr 2008 Posts: 2680 Location: New Brunswick. Canada.
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Posted: Thu Nov 10, 2016 4:15 pm Post subject: |
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Penman wrote: | Hi
Opens all right for me.
I've tried it on IE, Chrome and Firefox they all work |
Me too MS Edge |
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