View Full Version : Need more fuel

07-20-2016, 05:20 PM
Wondering if anyone can describe how I should adjust the carburetor so that it gets more fuel. Year 1966 390. The original carburetor.



07-20-2016, 06:22 PM
There are two idle mixture screws at the bottom front of the carburetor. If you turn them counter clockwise you will increase the fuel mixture. Clockwise will lessen the fuel and make it run leaner. It helps to use a vacuum gauge to set the fuel/air mixture.


07-21-2016, 05:41 AM
I will test this. The reason is that it is difficult to start, but then goes really well when it is hot. One expert said it was too dry. A test shows that it emits carbon dioxide 0.0. The tester was surprised when these cars usually have 4.5!

07-21-2016, 09:27 AM
If it is hard to start then it is a problem with your choke, not the idle mixture. Make sure that you have a working choke, everything is clean and operating freely, then use the method in your repair manual to adjust it.

When cold, the choke plate should be almost completely closed. A bi-metal spring inside the round black housing on the passenger side of the carburetor gets warmed up by heated air (from a small chamber on the exhaust manifold) and by a heater hose clamped to the side. When the spring gets hot it rotates the choke plate fully open. Mechanisms in the throttle assembly regulate high idle with a stepped cam during the warm-up period.

07-22-2016, 10:33 AM
Yes, that's right it's open all the time. There is no tube connected and the socket on the manifold is broken. I am attaching a hose and adjusts the cap. But the problem persists with a very low carbon dioxide. Can it be harmful to the valves?

(I use Google translate so all may not be intelligible?)


07-22-2016, 03:53 PM
If the exhaust manifold chamber can't be accessed then plug the ports going to the choke spring so you are not drawing in cold air. For summer driving you can probably get away with the heater hose alone.

Whatever you do, don't spend a lot of money on the old carburetor. The metal degrades with today's alcohol blended fuel, forming white deposits that clog the passages. Once this starts to happen you'll have to replace it with something more modern. And a modern carburetor will have an electric choke.

The basic chemical equation for perfect combustion is HC + O2 = CO2 + H2O, where HC is hydrocarbon, which in this case is gasoline. Perhaps your tester meant CO, not CO2. CO is from incomplete combustion, so low numbers are good.

07-22-2016, 04:14 PM
Your proposal sounds good. What carburetor do you think will be good?
Thank you for your commitment to my problem.


07-22-2016, 09:22 PM
Steve is correct. The original carburetors don't perform well with today's fuels. I recommend the Edelbrock 1406. It has an electric choke so you don't have to worry about the tube to the manifold.


07-23-2016, 11:03 AM
I'll defer to John for the carburetor recommendation. From all I've heard his is a good choice. I went with electronic fuel injection for my car, parts alone including a new fuel system were just shy of $3000. But I park my car in a basement garage so low emissions both during start-up and parked are a big issue for me.

07-23-2016, 02:27 PM
Many of us on here are running the Edelbrock 1406 carb with electric choke, myself included. It is an excellent carb!

Dan Leavens
07-24-2016, 06:54 PM
Couldn't agree more with John/Steve and Ray. Edelbrock 1406:D

07-25-2016, 05:16 PM
Thanks to you all. Installing an Edelbrock sounds like a welcome work when autumn arrives.

07-26-2016, 06:08 PM

Hasse på rogers custom sells the 1406 ,

easy carb to change the needles etc.

i have the black 64 and I think we met at the cafe in säve last year.

07-27-2016, 10:55 AM
Ja det minns jag, kul med svar. Ja får kolla med Rogers C, han är lite dyr bara. Vad har du själv för förgasare och hur har du kopplat choken?

07-27-2016, 12:09 PM
Hej Ja det minns jag, kul med svar.Ja får kolla med Rogers C, han är lite dyr bara.Vad har du själv för förgasare och hur har du kopplat choken?

Which translates as:

Hi Yes I remember , fun with answers. Yes 'll have to check with Rogers C , he's just a bit pricey . What have you for carburetor and how have you connected choke ?

07-27-2016, 04:30 PM
Hi Johnny ,
I have the 1406 atm on my car , no idea what camshaft i have and i guess i would need a slightly bigger carb , but it works for me atm .
The price was almost the same as a carb from the states when S/H and customs are incl, + its good to support your local speedshop :)

the choke just need a + Cable to work as its a bimetal i Think.

the 1405 is manual choke + its called a hot rod carb due to the diff/bigger jettings
1406 is Electric choke and more moderate jetting .

i will soon install a lambda sond in the exhaust tubes so i get better readings then from the end pipes.
I bought the needle and jettings set so i can change needles etc ,
when i bought the car it was a holley on it and the acceleration was much better , pretty raw with the front twisting on full throttle but it smoked like a steam Engine on full Power

last week i swaped the old Cruise-o-matic for a new rebuilt TCI C-6 .

please come and visit my garage ; )

07-29-2016, 05:09 AM
Thank you for the advice. Suitable fuel line together with your new carburetor? I'm not looking to run fast so it sounds good for me with a 1406. My motor (390) is original and I'm not going to touch it as long as everything works. Has finally learned from past mistakes: O) Where in Gräfsnäs yesterday, a local car meet in Southern Sweden with about 400 cars, and the car goes really well. There was about 15 other Tbirds from 55-66.
I put the pictures on my website for those who are interested to see how interest in Thunderbird is here in Sweden.

07-29-2016, 07:15 AM
Some interesting Squarebird pictures that I don't remember seeing before on your website

07-29-2016, 08:42 AM
Hi Johnny! Thanks for posting the link to your interesting and very good website! I enjoyed the many links and pictures. I saw two yellow Flairbirds, one with a white top and one that was completely yellow. Is that your '66 Flairbird. Was it originally a white top and then you painted it all yellow? Or the other way around? Just wondering. For those of you without a knowledge of Swedish, like me, I brought up the site in Google Chrome, clicked on Translate and it immediately translated the site to English. Thanks for sharing.

I am always looking for Flairbird pix for the Squarebirds Calendar! If you would like to have your Flairbird considered for the 2017 Calendar, send me some really good, large high definition pix. Check out Anything Goes Forum on what to set your camera to, and how to stage your Tbird for the best shots if you are interested.

07-29-2016, 03:03 PM
Hi and thanks
On the first page, you can see my car and some pictures from the renovation. The idea was that it would become Honeydew yellow but automotive paints author did not find quite the right color! Seems that the yellow paint accentuates the car's lines in a good way and that I am quite alone in having a yellow Thunderbird. It was previously white, Wimbledon, I think it's called. I usually use the free program GIMP (similar to Photoshop, but free) before making changes. An easy way to trial and facing a choice of color of the car. Happy to send you a picture of my car, what address?

07-29-2016, 03:22 PM
Hi Johnny, I just took a look at that first picture again. I see what I thought was a white top in the sun, is actually yellow, just like the rest of the car!:D It is very nice looking! When I bought my '59 it had a white top (it left the factory with a black top according to the data plate) and a Casino Cream body. So many people did not like the color and neither did I, so I had it completely repainted to what you see now.

As for sending me pictures of your Tbird to consider for the calendar, you can email them to me. I will need high definition pix of 3000-4000 pixels, or 3-4MP. Take a look at the Thread in Anything Goes on what to set your camera to and how to pose the car for the best pix. I will be glad to consider her for the 2017 Calendar. I enjoy being able to include some of our Tbirds from "across the pond" each year.