|
By Kahuna - 15 Years Ago
|
|
Hello all Wondering if anyone here with dual 4 bbl experience (Teapot carbs) knows if the secondary springs are/were lighter than those used on a regular 4 bbl appplication? Thanks Jim
|
|
By suede57ford - 15 Years Ago
|
|
I have always had to use the lightest spring that is in the Holley secondary spring kit to get them to open easily when using regular 56 ford teapots on a 2-4 intake. You may have to buy two spring kits, just to get two of the light springs you want. I added an edelbrook A/F ratio meter that really helped me get the jets dialed in properly. The E-code carbs have a different venturi, so you can't just use the same jets as they do. I had to solder up and redrill the secondary jets to make them smaller on a regular '56 ford teapot, as well. Adding the secondary tube to connect the two carbs like on an original e-carb, is easy to add, and helps the secondaries open at the same time, yet make it look more correct as well. My last set-up ran really well and got up to 18mpg on trips.
|
|
By Ted - 15 Years Ago
|
|
The secondary springs in the dual quad carbs have essentially half the tension of those in the single quad applications. This is due to the vacuum signal being reduced in half to each carb when using two of them as a pair. The long yellow spring in the Holley spring kits would be the stock spring for the dual quad applications. As Pat mentions, it will take two spring kits so you can keep matching springs in both carbs and using even lighter springs will have the secondaries opening earlier. The short yellow spring would be the next quicker opening spring while the white spring would be the lightest.
|
|
By Kahuna - 15 Years Ago
|
|
Hi Pat & Ted Thanks for the information. I was wondering if the Holley spring kits sold would work. Thansk again Jim
|
|
By Kahuna - 15 Years Ago
|
|
Also, Pat, I'd love more info on the secondary jet downsizing and what size dril you ended up using? I did add a balance tube for the secondary vacuum. Thanks Jim
|
|
By suede57ford - 15 Years Ago
|
|
I had to solder the longer secondary jet up and redrill them, as they are too large for a dual quad application. I think I used the stock figures, 55 for a dual quad car when I redrilled them, as the secondary air and fuel track on seems to be the same on a e-code carb and a '56 ford carb. I still recommend getting an Edelbrock fuel ratio meter, PN EDL-6593 $139.95, from Summit, so you can figure out wha tis really happening when you make changes. I have mine on a plug in harness and mounted in velcro, so I can remove when I don't need it. All it takes is the included O2 sensor mounted in one of the exhaust pipes.
|
|
By slumlord444 - 15 Years Ago
|
|
When I first put my dual quad setup together in '65 I used the '56 single carbs and jetted them according to a '62 Hot Rod Magazine book on Ford engines. Had a heck of a time finding the correct jets for the secondary's but finaly did. Ran great. When I finaly found the prober carbs, found that the jetting was way too rich. Jets same as for '56 single carb. Subsequently found second set of correct carbs. They also had single carb jets. I have wondered ever since if many of the problems with the original dual quad setups back in the day was not because Holley somehow put the wrong jetting in many of the carbs causing them to run way too richj. Ford parts books show jet sizes close to the Hot Rod recomendations. Any one else out there with original carbs ever checked the jet sizes?
|
|
By Hoosier Hurricane - 15 Years Ago
|
|
Slumlord: My '56 dual carbs (EDB-C) came with 45 primary, 55 secondary, and 38 power valve jets.
|
|
By Kahuna - 15 Years Ago
|
|
OK guys. I really appreciate the info here and think it'll really help down the road. Pat- I did put in bungs for an AFR gauge when I built the headers. That Summit item looks like something I will get. Thanks Slum- I'll do some research and see about that 62 HR article Jon- Those jet sizes that you provided, Thanks Regards, Jim
|
|
By Hoosier Hurricane - 15 Years Ago
|
|
Jim: Those primary jets will be too lean in a regular '56 carb. The secondaries should be close.
|
|
By Oldmics - 15 Years Ago
|
|
Hoosier The Holly sheet for the EDB carbs calls for 48 primary jets,55 in the secondary position and a #28 power valve. In contrast the 57 carbs (ECJ-9510-AA/LIST 1434A and ECJ-9510-AB/LIST 1437A) Holly sheet calls for 45 in the primarys,55 in the secondarys with the use of a #32 power valve. I"ll have to take a look see at some of my 56 carbs to see what is in them. Oldmics
|
|
By Kahuna - 15 Years Ago
|
|
Thanks John I'll stick with the stock #50 jets until I can get the car on the road and check with a AFR meter. Thanks again everyone. This site is invaluable. Makes me want another Y-Block. Jim
|
|
By slumlord444 - 15 Years Ago
|
|
John, sounds like yours had the right jets. I am running .048 mains and .55 secondaries per the 1962 Hot Rod Ford Performance Manual. Do not recall what the ones where that came in my carbs but they were much larger.
|
|
By PF Arcand - 15 Years Ago
|
|
Slumlord: Re your reference to the 1962 Hot Rod performance book.. Is that by chance the book, I think was titled "Hot Rodding the Ford V-8" ? I think the editor was ______ Brock?
|
|
By Hoosier Hurricane - 15 Years Ago
|
|
Someone probably changed the jets in my carbs, maybe for better mileage. Mileage with 24s?? What's the point. I did get 22 mpg with that setup in a '56 Fairlane with 312, mild cam, and OD. Didn't believe it, checked it again on the return trip, same result. Didn't use the secondaries though. Paul, the HR editor you are thinking of is Ray Brock.
|
|
By Kahuna - 15 Years Ago
|
|
I really appreciate all the infomation you guys have provided. It will definitely make things easier for me when the car is on the road in the Spring. The jetting and spring info is especially helpful, knowing what Ford/others used, rather than have to do the trial & error method. Much appreciated Jim
|
|
By slumlord444 - 15 Years Ago
|
|
It is Ford Peformance Handbook by Ray Brock and the editors of Hot Rod Magazine. I only have a photo copy from 1966 that is fading badly. Would sure like to have an original copy. There is a ton of vintage Ford info in it.
|
|
By Hoosier Hurricane - 15 Years Ago
|
|
Yeah, I still have my copy. It's worn, dog-eared, and the cover is loose, but I still look at occasionally.
|