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Weber 34ADM

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I am a big fan of these carburettors, so I have put up some pics and an explanation of the function of various parts.

1. Throttle nudger: On the XE/XF Falcons this is used to hold the throttle open slightly during an overrun condition by applying vacuum at the hose fitting. The screw in the top sets how much the throttle is held open. I have never used this mechanism for its intended purpose, but I have used it to cause a fast idle when the air-conditioner is turned on by applying manifold vacuum via a solenoid.

2. Accelerator pump accumulator: Receives the fuel charge from the accelerator pump and controls the discharge rate of the fuel into the air stream.

3. Fuel inlet fitting.

4. Fuel filter plug. There is a small plastic filter under this plug.

5. Fuel return. On some models this is used to return fuel to the fuel tank when item 6 (below) is fitted.

6. Fuel return solenoid fitting. On some models there is a solenoid screwed into this fitting that energises when the throttle is closed, allowing fuel to return to the tank when at idle.

7. Idle solenoid. Allows fuel to flow in the idle circuit when this solenoid is energised. +12 Volts must be applied to this solenoid when the ignition is switched on.

8. Power bypass circuit actuator diaphragm. Allows fuel to flow in the power bypass circuit when low manifold vacuum is sensed.

9. Accelerator pump lever.

10. Electric automatic choke mechanism. Under the green plastic cover there is a heater element and a bi-metallic spring. +12 Volts is applied to the threaded stud in the centre when the ignition is on. The heater element heats up and in time, causes the bi-metallic spring to rotate the choke shaft, causing the choke to open. Loosening the three screws allows the cover to rotate, to adjust the choke to the correct fully open position after warm-up.

11. Fast idle screw. Adjusts the fast idle speed. Operates whenever the choke is partially closed. There are several steps of fast idle due to the operation of a stepped cam inside the choke mechanism. Adjustment should be made for fast idle on the first step after a cold start. Do not use this screw to adjust the normal idle speed.

12. Choke pull-off diaphragm. Cracks the choke open slightly as soon as the engine starts. Under the small brass plug at the centre there is a grub screw that adjusts how much the choke is cracked open.

13. Accelerator pump. Pumps fuel into the air stream, via the accelerator pump accumulator, during hard acceleration.

14. Idle speed screw. Adjusts the idle speed. To be adjusted only after the engine has reached operating temperature, and the choke is fully open.

15. Vacuum advance connection. Connects to the distributor vacuum advance diaphragm.

16. Idle mixture screw. Adjusts the idle fuel/air mixture.

Brett.

Comments

Thats heaps of good information. you should add in the holdenpedia [http://www.oldholden...|HERE]

Cheers Tom
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Cheers Tom

i agree u should do that for sure. I am considering trying to put one of these on my HG.. but i have not a clue in the world about carbys lol :P
Download the VIN and Paint Code Program
[http://users.on.net/...|Cuddys Option Coder Program]

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That's great, I'll add it to the Holdenpaedia now.

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It's added now I'll just tidy it up a little on the page.

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Thanks Reaper.

Brett.

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No worries Brett, I might try and do the same with the 32/36 DGV too as after reading up on it I've found out it's a very commonly used weber. Would be good to have a fair bit of information on that page of the weber configurations that can be used.

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Thanks Brett, that is a resource and a half,
from [http://oldholden.com...|Previous posts] I followed your instructions to see if the Choke was opening and it worked perfect, Next will be a check on the Power bypass circuit actuator diaphragm, Item 8, do see if that is causing my excessive fuel consumption.

What would happen if the throttle nudger was plugged up (as in my installation), or possibly leaking?

Thanks for the Picture

Cheers

Matt.

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Out of curiosity how many CFM does this carbie flow?

How does that compare to single barrel stromerg? twin barrel WW-stromberg? and Quadrajet?

I think the quaddie was around 700cfm from memory. Not sure about the rest, anyone fill in the blanks?

It would be good to have a pic of the underside of this carb to show the primary and secondary barrels, even better if it was sitting next to the stromberg at the time for comparative puproses.

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Don't quote me on this because I'm not 100% sure but I found this information for some webers:

[table Type | cfm
Weber 32/36 | 325 cfm
Weber Dual 38 | 390 cfm (Downdraft)
Weber Dual 40 | 405 cfm (Downdraft)]

So looking at that I'd guess that the 34 ADM would flow around 340 cfm.

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I have a picture of the under side [http://gallery.oldho...|here]

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I have read that the WW Strommies flow just under 350 CFM.

Cheers...Dave

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Cheers...Dave

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Nice work guys!

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Never Drive A Car Younger Than Yourself!

Hi all. Chasing a post from a few or more weeks back about somebody pondering putting a 34adm Weber on a 253. Making a special adaptor and mounting the carbie side on so 1 barrel would feed both sides of the manifold. I wonder was it tried and how successful was it. Can't find the thread though.
Cheers
LMH

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Ecotec V6 Conversion Suspended. Keeping it original!
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hi. i want to fit a weber 34 adm to a 253!!!. can it be done if so how???.

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Really nice work man,

I recently got one of these carbs up and running on a Hemi 6 Valiant (first to do this, from what i could find :-D

it is running, and running well, but half of the lines/ports i have just blocked off. i am only using spark advance, and the fuel inlet valve.

I want to set everything else up correctly, but i dont know what goes where - can anyone supply a photo with everything hooked up correctly?

thanks!
Steve

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Thanks heaps very helpful. I have also included a link to ford technician bulletin for weber 34 ADM.

http://www.ozfalcon....

I would also like to add this tuning guide I found:
http://www.justbrits...

Another guide related to jetting:
http://www.jeepforum...

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Some days I love cars somedays I hate them

Found this on the early commodore page hope it helps people with vacuum lines it helped me.

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Some days I love cars somedays I hate them

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