Autolite 4100 differences - Ford Muscle Forums : Ford Muscle Cars Tech Forum

pmaenner · 01-25-2013, 09:12 PM

Hello Everyone,

Found some great info on rebuilding the autolite 4100 here, but have a question. I've got two 4100's. One is an older EDC marked one, which I'll be using for my 351, and 1966 version (1.08) that'll I'll be using on my 302. I've noticed some mechanical differences between the two. Do I need to purchase different build kits? I haven't seen anything advertised as such.
Also, on the older one, there are two vacuum tubes, one over the primaries, and another one over the secondaries. The newer doesn't have that. What's the purpose of the vacuum tube over the secondaries? None of the manuals or pdfs mention it.
Is there much difference between an early and late 4100? Are there any modifications I should do when I am rebuilding them? Thanks for your help and time! Stay warm out there!

-Pete

KULTULZ · 01-25-2013, 11:51 PM

Quote:

Originally Posted by pmaenner

I've got two 4100's. One is an older EDC marked one, which I'll be using for my 351, and 1966 version (1.08) that'll I'll be using on my 302.

I've noticed some mechanical differences between the two. Do I need to purchase different build kits? I haven't seen anything advertised as such.

No. The kit (quality) comes with enough service parts included for most all models of the 4100.

Quote:

Also, on the older one, there are two vacuum tubes, one over the primaries, and another one over the secondaries. The newer doesn't have that. What's the purpose of the vacuum tube over the secondaries? None of the manuals or pdfs mention it.

Is there much difference between an early and late 4100? Are there any modifications I should do when I am rebuilding them? Thanks for your help and time! Stay warm out there!

-Pete

The tube over the secondary venturis is for actuating (vacuum signal) the secondaries.

There are many differences (although minor) over the years, especially heading to the emission years.

Just follow the instruction sheet to the letter and to the I.D. Code.

berends9996 · 01-26-2013, 09:55 AM

Go to Auto Zone they have the rebuild kit 96-134D and it has the secondary diaphragm too.

Sent from AutoGuide.com App

puttster · 01-26-2013, 11:48 AM

Quote:

Originally Posted by berends9996

Go to Auto Zone they have the rebuild kit 96-134D and it has the secondary diaphragm too.

Sent from AutoGuide.com App

X2, though they don't include the small check ball for the secondaries and the gasket for the power valve is too thin so save your old one.

KULTULZ · 01-26-2013, 03:03 PM

You guys need to stay away from those box stores and find quality parts elsewhere-

Autolite 4100 Carburetor Kit

I think even the OEM kit is still available- C2SZ 9A589-D

pmaenner · 01-26-2013, 07:21 PM

I'm a bit confused on two things. If the vacuum tube over the secondaries is for actuating the secondaries, then what is the vacuum tube over the primaries for? Are both needed for actuating the secondaries? Also, the other 4100 I have doesn't have a tube over the secondaries, only the primaries. There is no place I see to install one over the secondaries.
Also, I keep seeing references to the 1957 4100 and how it is different. But all they say is that it is different and doesn't say what the differences are. Can anyone clue me in? Thanks for the info!

-Pete

KULTULZ · 01-26-2013, 10:05 PM

Quote:

Originally Posted by pmaenner

I'm a bit confused on two things.

If the vacuum tube over the secondaries is for actuating the secondaries, then what is the vacuum tube over the primaries for? Are both needed for actuating the secondaries? Also, the other 4100 I have doesn't have a tube over the secondaries, only the primaries. There is no place I see to install one over the secondaries.

When you say other, you need to be model specific. On the left mounting foot should be I.D. Nos. stamped. Can you read them? Can you take and post a photo?

Quote:

Also, I keep seeing references to the 1957 4100 and how it is different. But all they say is that it is different and doesn't say what the differences are. Can anyone clue me in? Thanks for the info!

-Pete

The 57 was the first design. It was only for one year. Main differences were accelerator pump design and divorced choke asm.

pmaenner · 01-26-2013, 10:48 PM

Howdy!

I can't post photos, as I don't have a camera. I'll get those numbers for you guys. The carbs are not with me right now, I'm out of town for work. One has a tag on it with I believe c6af. That one has one vacuum tube over the primaries. The only thing I remember off hand for the other one is that its marked EDC, that one has a vacuum tube over the primaries and one over the secondaries. I'll go over them and get more info. I appreciate your help!

-Pete

KULTULZ · 01-26-2013, 11:00 PM

Tag Nos if you have them are much easier to cross.

KULTULZ · 01-26-2013, 11:26 PM

Quote:

Originally Posted by pmaenner

I'm a bit confused on two things. If the vacuum tube over the secondaries is for actuating the secondaries, then what is the vacuum tube over the primaries for? Are both needed for actuating the secondaries?

Also, the other 4100 I have doesn't have a tube over the secondaries, only the primaries. There is no place I see to install one over the secondaries.

-Pete

The tube you see over the primary's is the secondary opening signal source (see attached).

If the tag is still attached, there will be alpha characters after the first four, narrowing the CARB ID down further.

The EDC, where is that ID located, on a tag or the carb foot? Any other stampings?

FEandGoingBroke · 01-27-2013, 11:59 AM

Great pics of the 4100! I have a 60 Bird customer with a 352 that I "think" sports that identical carb! I will wait till summer to see it again but I think it's the 1.19 model 4100.

If it5 is I'll get some good pictures of it and pics of a normal 4100 next to it for archival purposes.

pmaenner · 01-27-2013, 02:27 PM

Howdy!

I got things a little backwards. I also cleaned up the carbs and got the markings down.

The first one has 1.08 on the side, and has a tag marked C6SF A with A 56 D below that. Above the 1.08 looks like the number 73, but that is faint. This is the one with vacuum tubes over the primaries and secondaries. I got things mixed up (I'm not the sharpest tool in the tool shed!)

The second one has EDC marked on the side. There is no tag. Above that and a bit to the left is another circle with 11 and 57 below the 11. Also below the EDC and a bit to the left its marked 7BR D. This carb just has the vacuum tube over the primaries, and has the choke plate with the smaller hinged flap in it.

I appreciate your help! Much thanks!

-Pete

KULTULZ · 01-28-2013, 02:50 AM

Quote:

Originally Posted by pmaenner

I got things a little backwards. I also cleaned up the carbs and got the markings down.

The first one has 1.08 on the side, and has a tag marked C6SF A with A 56 D below that. Above the 1.08 looks like the number 73, but that is faint. This is the one with vacuum tubes over the primaries and secondaries.

Photos are always welcome. I would really appreciate a photo (top view) of this particular carb. This is one of the first emission 4100 carbs.

When PONY CARBS went out, I hate to think of the knowledge gained that will be lost.

FEandGoingBroke · 01-28-2013, 07:56 AM

I got one of their last carbs in this 64.5 stang I'm restoring. I'm sad they're gone, their work was unsurpassed!

You want a pic of the C6SF-a carb? I have 2 C6- 4100 in my shop somewhere...

KULTULZ · 01-28-2013, 08:13 AM

Quote:

Originally Posted by FEandGoingBroke

You want a pic of the C6SF-a carb? I have 2 C6- 4100 in my shop somewhere...

I need to see that second vacuum tube. Top shot.