Weber IDF Linkage

[Special]

I am trying to make some kind of linkage for my dual 40 IDF set up.
What do you think would be the easiest way to go ?
The options are to find an original linkage for the waffle manifold , or fabricate something myself.
I don't mind making it myself , but I don't know where to start.
Does someone have a picture of an original linkage installed on the manifold , preferable out of the car , so I can see how it works.
Or any other suggestions would be appreciated too.
Thanx.

[manoa matt]

I have a folder on my computer with a bunch of different linkages people have come up with. All of them work,(I think), some are simple, some are complex, also the original one. Send me an email for the pictures matt.scarton@gmail.com

The questions are, what series carbs do you have, what manifold do you have, what is your current throttle/pedal setup?

[BEEK]

if you have the cable style pedal i have an easy solution for you. the twist style linkage on the 78 and later spiders, which bolts to the valve cover. all you have to do is extend the end that the rod which goes to the carburators about 3/4 of an inch, and the rod will pull from in between the carbs with no problems, i think i had to shorten the rod a little. the change in ratio was not real apparent to me at the pedal

[Special]

Here is what I have now :






And this is my carbs set up - I have no idea what series they are



I want to try to use the existing linkage , but I dont know how to make the connection to the carbs.
Any ideas ?

[BEEK]

not going to happen using the existing linkage, but you have what you need to add the later spider twist linkage on the valve cover. that way you could go back to the original if you wanted later. you just need a twist linkage and rod, the pedistals are already on your valve cover, if they are not tapped, that is easy

[manoa matt]

If you were the one that made the brackets for the fuel filter and regulator, then a bracket for the throttle cable should be easy. There are several options that I see.

The first is, switch the valve covers. Use the two studs on the valve cover to mount a bracket that holds your existing throttle cable between the two carbs at about the same angle as it is now. Connect the ball linkage stud at the end of the existing throttle linkage to the ball on the linkage between the carbs. When you press the pedal it will pull and open the carb throttle plates. Make the bracket carefully so you get full travel and the carbs can completely open.

Another option: see the angle bracket with the rubber bushing bolted to the bottom of the intake manifold? There should be another one at the back of the manifold just out of the picture. These held a rod that was the original linkage. If you source at rod (I have one) then you can set it up like the original linkage. I can't explain it fully, but when you see a picture it will be clear how it's done.

The important thing is you have several return springs in the linkage system. One at the pedal, one or two in the linkage system and one at/on the carb throttle shaft.

[Special]

I will be using clean valve covers , without any studs or holes , so the first option is out.
If you right click on my picture and push view image you'll see - where is no other hole on my manifold.
That's why I wanted to see how the original linkage mounted on it.
I came up with another Idea.
What if I install a lever like this http://www.ebay.com/itm/250911076358?ss ... 1497.l2649 on the right side of the right carb , and use my existing cable. All I have to do is a fabricate some kind of bracket to hold this cable and attach it to the cam tower bolt right under it and install some spring to pull it back.
I think it is an easiest way to go.
I wish somebody posted some pictures .

[Daniel]

a real simple solution would be to use a motorcycle cable with a bracket at the carbs attach it to your
gas pedal after drilling a hole in the firewall at the appropriate location.

[Special]

I don't really want to use the cable.
It stretches and needs an adjustment and lube every once it a while.
I brought some staff from the junk yard today.
Will try to make something out of it.

[elderair]

Just wondered if you conquered your weber IDF linkage issue. They appear to be 13/15's. Morgan in England sells the Carbtune Pro II manometer with four pistons that slide nicely in a metal bore that sync the carbs perfectly every time and quickly. I would suggest while the carbs are off to drill the four vacuum ports on the base of the carbs from 4mm up to 5mm X .8. They are the ports with the little brass plugs in them. Almost every vacuum take off brass adapter is 5mm x .8 thread. I could not find a 4mm and wound up using drilled screws for years. Finally drilled them up to size. Dellorto/Weber web site sells a very nice set of four brass take offs in the 5mm x .8 thread and I have some ordered. Meanwhile I am using a set of threaded brass tubes available off the motionpro web site that are 5mm. Just carefully drill and tap the four holes up to 5mm and locktite and thread your brass adapters in and you are good to go. I have a PBS manifold and use the factory 1975 cable and modified bracket that fits on one stud from the front carb and one from the back carb. Looks like you have the factory waffle manifold so this set up may not have room. That is based on a friend that tried my set up on his waffle. Hope you got it worked out. I can send pics if you want them or post some when I get time.