Topic: Autolite 2100 differences

[trucktricksdon]

I have been in the process of rebuilding my carburetor. The date code stamped on mine is 8-65. Upon disassemble, I could not get the idle mixture screws out of the body of the carb. I tried everything I knew and they were just seized into the base beyond removal. Contemplating what to do, I stumbled on an Autolite 2100 on EBay in which the owner said had been taken off of a 66 Mustang, so I bid on it, won it, and received it today. The date code in this Carb is stamped 6-65, two months older than the one that was originally on my car. I figured I'd document these differences and maybe someone out there can explain them. Several things I noticed....

1. The holes in the slosh tubes are a different arrangement. The newer carb has, I believe five holes and are arranged four in a row and one on the opposite side by itself, and the older carb has just three holes per tube. Does anyone know why this would be different?

2. The float on the older carb is metal and the newer carb is foam. I just found it interesting that within those two months of production, this had changed. I am assuming these were original and had never been messed with.

3. There is a shield around the fuel inlet valve on the older carb, the newer carb is void of this shield.

4. There is a fuel dispersion plate on the newer carb that is void on the older carb.

Not sure which stuff to reuse, I think I may use the body off of the older carb since the idle mixture screws are seized in the newer one, and all of the parts from the newer date configuration, since they are original to the car, but I am just wondering if combining the two would present any problems.

[bryancobb]

The DATE is not all that matters.  There was DOZENS of applications for the 2100 in 1965 and each one is different in one or more ways.

The only way to compare carburetors made 1 month apart, is to compare 2 OF THE SAME NUMBER!  For instance, a C6DF-B with a date
1 month later than another C6DF-B.

[trucktricksdon]

My original carb had a C6DF B tag on it, the other did not. Based on the sellers info, it came off of a 66 Mustang so it may or may not be a C6DF. Without the tag, I assume there is not way to tell?

[bryancobb]

Yes.  On the base near one of the 4 stud mounting holes, there will be 3 digits.  A C6DF-B would have  6DB (I THINK).  A C5ZF-A  would have a 5ZA (I think)

[trucktricksdon]

Ok The carb that is missing the tag is showing a 6D-A near the mounting stud hole, which would most likely be C6DF-A. Knowing how current Ford part #s work, at least on electronic stuff, the suffix letter in most cases means a revision, the higher the letter, the more current the revision. I am sure this would explain the differences.

[jwc66k]

The carburetor in question, C6DF-9510-A, was used on 260cid engines apparently as a replacement. That's the only application I found in several sources, the Ford Car Parts Book (sec 95 pg 34), the 66 Shop Manual and the 66 Ford Specifications. The dash number (letter) represents application more than revision (manual transmission, automatic transmission, Cal smog MT, Cal smog AT, low compression, etc). It can be adapted for many uses by changing jets, seconday venturi, etc. I think the foam float was a service replacement as brass floats were used in 66.
Jim

[trucktricksdon]

Thanks for the info on this. The foam float was definately suspect....a clear indication that it had been serviced before. I guess my main concern is the actual body of the carb....can it be combined with the parts from the original carb? It really appears to be identical (the main body), with the major differences being the slosh tubes and various shields inside the carb.