Frankie the Fink

The problem is some Chinese 'white box' fuel pump rebuild kits have incorrect diaphragms and they raise the fuel pressure....I've heard of 13psi in one case. I put in a regulator when I was troubleshooting just to ensure a steady 5-1/2 psi while I jiggered around with other things. I now have the regulator out of the fuel circuit and things are fine. I think 7psi is the very upper end of where these old carbs can operate.

1snake

I think it's the quality of the parts used to rebuild them. I've rebuilt at least 50 WCFB's using Borg/Warner kits and have never had a problem. A quality needle and seat should easily handle well over 7 PSI.

Jim

narlee

I brought up fuel pressure because I assumed his rich issue was at idle and it would be something to check. I can't remember where I ran across complaints of new pumps with extremely high pressures. He stated in a later post he checked it. As far as the capability of a carburetor to handle fuel pressure it seems it would have to do with the floats and location of the pivot point being able to exert enough force to overcome the fuel pressure. Because of different float arrangements some carbs would be more susceptible to higher fuel pressures.

Frankie the Fink

I'm just going on what Bob Kunz told me when I was on the phone with him while dialing in my carbs... Supposedly the neoprene tips on the needle valves were partially to address high fuel pressure. Work well when new (after a rebuild) then things degrade if you believe Popular Mechanics: http://books.google.com/books?id=QeM...oprene&f=false

Thus, car could run fine after a rebuild and things get worse as you go along...with excessive fuel pressure. And "excessive" prob varies from carb-to-carb.

I think the moral of this story though is, "...don't buy clone WCFBs unless you are certain all the parts 'play' together". Unfortunately these carbs were used on Packards, Buicks, Chevys, you-name-it, for several years and some sellers just 'cobble' together enough stray cat and dog pieces to get them to sell on fleabay.

When dialed in the carbs are phenomenal. The only part of me that has touched my WCFB dual quads in nearly a year is my right foot operating the throttle linkage.

Kerrmudgeon

I picked up two CarterRacing 500's for a project I'm putting together. Any one used these before? God, bad, or ugly? On a 57 manifold, 331, 11+1/2 to one, 2.02 heads, and hookers. Thanks in advance.

1snake

That's the best thing for them. The worst thing is to let them sit unused for long periods of time (like I do ).

Jim

Kerrmudgeon

TTT, anybody? Carter racing right on the carb....any knowledge. Didn't Edelbrock buy the rights to these...? Look like AFB's sorta.

tach drive 61

well today I had carbs flow tested again front carb they put in smaller jets , now to make sure the intake gasket is installed right next time around , the mr gasket #732-100 has been recomended but the felpro blue may deserve one more shot , has any one ever used a felpro MS 9617 seems the ports on the 291 head and matching to the smaller port on 2x4 intake may have been trouble

johnde23

I have a 58 Vette with 2x4, anyone know the jetting size for the primary, rear Carb. Running rich and I believe I need to lower my jetting, has been rebuilt but I have no idea what size the put in. Thank you, John

Frankie the Fink

The Spec section of the ST-12 has your carbs' relevant data and is online now:
http://chevy.oldcarmanualproject.com...62csg1413.html

PAmotorman

make sure you have the correct spring in the power valve piston. take the cover off and see if the metering rods are down at idle

Frankie the Fink

IIRC correctly that's the vacuumeter piston and yes there were different spring depending on the cars vacuum characteristics. The rod sizes should be etched on the rods too

jrm5657

You hit the nail right on the head. You can buy an assortment of power piston springs for a Carter AFB which happen to fit the WCFB also. They are calibrated for different vacuum levels so you can get the power piston and metering rods to drop down into the jets at idle.

PAmotorman

till I retired 2 years ago I was rebuilding stock carbs and building race carbs since the 50s and seen most all that can happen. I was building 4 shooter AFBs before holley came out with their 4 shooter 4224.

PAmotorman

I used one of these.on holley carbs when I did not have to hide the secondary squirter in the air cleaner stud housing for class rules. it was not cheating just creative engineering.

kolsen911

PAMOTORMAN
I have two Carter AFB's on my Hemi/Vette. They have no ID, might have been one's with the little tag, and no chokes. Sent away for a Carter book to help in my ID and tuning. Any other source for info. Supposed to be a local my friend told me about who's familiar with Hemi's I'll look up in the spring.

PAmotorman

I think you are out of luck if the tags are missing. are there casting numbers on the parts and if you find any google them and see if you can find the original use of the carbs. some WCFB carbs can be identified by casting numbers.

kolsen911

No numbers. I looked in the Carter book for the location of the markings and found nothing on my carbs.