Holley 94 Rebuild - Secondary Carb

[Ziggster]

Installed the choke shaft thinking I need to plug the shaft holes in the body. Then had to come up with an idea to keep it from dialling out, so installed the choke lever with detent and spring. Added a lock washer (only washer with correct ID on hand) to the shaft to take up some side to side play. Would be intetested in what others have done to seal off those holes. This is pretty much it for now regarding this carb. Will mount to intake and remove my other carb from the engine and install it on the dual carb intake this afternoon to start looking at the linkage.

[Ziggster]

Link to vid showing accelerator pump/squirter function.

https://youtube.com/shorts/at1q_GFSr...0K3tZN1xTszw9_

[Ziggster]

Had to work on the studs of the Edmunds intake. There was one slightly damaged section of threads for the secondary carb. Don’t have the fine 5/16” die, so just had to use a nut and carefully advance it and then back it off line a die. Some of the other threads were also slightly gummed up. All good now, and secondary carb is mounted. Removed primary carb from the engine. Could not remove the throttle plate screws without adding some heat, and even then there was one problem child. Eventually got it off without any drama. Then had to remove the throttle lever from the shaft as I’ll need it for the new shaft. Again, used the mini pneumatic bent sander, and gently pried it off. Then went to install the new longer throttle shaft and it went in fine from the throttle lever end, but then got stuck going through the body on the other side. Had to use some 400 grit paper wrapped around a drill bit and “ream” if out with my cordless drill. Didn’t take much to get it to pass through. Sanded down both mating surfaces of the base on my glass table. lol! So much damn fiddley work. Next, I’ll install the hex head idle mixture screws, then re-install the throttle plates.

[1952henry]

I stand to be corrected, but I believe research has shown that the choke plate is beneficial for air flow. I built a 2x2 on a Thickstun for a fella. I drilled and tapped the choke shaft boss for a hex head set screw to “lock” the choke flap in open position.

[Ziggster]

Primary base with new hex head idle screws, new extended shaft, throttle lever, and throttle plates installed.

[Ziggster]

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Primary base installed on intake with linkage. It’s going to take some playing around to figure out how to adjust this linkage. Right now the 3/16” rod hits the primary shaft when fully open. Feel like I’m going to need four hands to do this. Haha!

[Ziggster]

Talking to my cousin about the linkage, and right away he noted I’ll need a longer arm on the primary shaft in order to get the secondary plates to fully open with only 35% rotation left in the primary shaft. lol! He’s also a mech Eng but has been in banking most of his career. Haha!

[Ziggster]

Installed the new larger throttle arm, and adjusted it so that secondary is fully open. Probably starts to open at 50% of primary rotation, but I’ll tweak it tomorrow. The Edmunds choke brkt interferes with the vacuum port. So, each fab up my own choke brkt, or replace the main body with one which does not have that vacuum port. I’ll likely do that. Made a vid and post it to my YT channel. Will also add a third retaining screw to the Edmunds air cleaners and switch to more appropriate vintage hardware. lol! Always something. Probably will take a break, for a day of two, then get bd k at it and fab up fuel lines to carbs and from the pump.
M

[Ziggster]

With air cleaners installed.

[Ziggster]

Link to vid with linkage operation. Should mention that the link between the throttle lever and accelerator pump is not yet installed if someone was wondering. It’s all going to be torn down again.

https://youtu.be/idKZX20nA0k?feature=shared

[Ziggster]

Added another vid showing linkage from other side.

https://youtube.com/shorts/pPoi7xlR8...wGRQdbLA7KoM6G

[Ziggster]

Originally Posted by 1952henry

I stand to be corrected, but I believe research has shown that the choke plate is beneficial for air flow. I built a 2x2 on a Thickstun for a fella. I drilled and tapped the choke shaft boss for a hex head set screw to “lock” the choke flap in open position.

Interesting. I’m going to see if I can find more pics of dual carb setups. I think I’ve only come across one pic, and it didn’t have any of the choke levers, but didn’t see the inside so not sure if choke plate was installed. In theory, more obstructions will reduce airflow, but in reality, more airflow is not really required. What is required is the proper air/fuel ratio.

[1952henry]

https://www.fordbarn.com/forum/album...ictureid=17586

Here is the 2x2. You can see the choke shaft in the front carburetor. I removed all the bosses for the choke hardware, smoothed and chromated. Except for the throttle arms, all other hardware I made from stainless.

[Ziggster]

Had a look at your album. That’s some fine craftsmanship on that dual carb setup. Much more vintage looking than the commercial stuff available.

[1952henry]

Thank you. Hacksaw, rat tail file, a buffing wheel and a lot of hours. Enjoyed every minute.

[Ziggster]

Decided to finish sanding parts for two more bodies. These ones do not have the vacuum port, and had the “breather” hole on the air horn section which I filled with JB Weld. The second air horn was pretty badly beat up, so added a skim coat of JB Weld to a few areas. Will be interesting to see how it looks after psint. One carb already has two coats, and the other is ready for its first coat. I won’t be cleaning/painting anymore parts.

[Ziggster]

The pitted/beat up area after one top coat. Should have applied some more JB Weld on the rounded section next to the flat section I applied some to. Too late now. Haha! Treated areas look much better.

[Ziggster]

So, the insanity continues. I knew that the paint did not match which I used on the rebuilt carbs with the original, but just thought maybe the primary which was painted back in 2020/21 just “faded” and got darker. However, looking back at pics from that time it was darker. Damn! Decided to then re-paint the base of one of the freshly rebuilt carbs with the same colour. Seems it’s DupliColor Cast Coat Iron. I have to swap the main body of the primary carb anyway due to the vacuum port on it which interferes with the Edmunds choke brkt. So, the primary carb will get a Cast Coat Aluminum painted main body without the vacuum port, and a Cast Coat Aluminum air horn to match that of the secondary carb.

[Ziggster]

Swapping out parts from the main body on the secondary carb with vacuum port to the non-vacuum port body, the needle valve for the accelerator pump circuit wouldn’t fit in the bore. Had to get the same size drill bit as the bore and clean it out (by hand). Lots of crude came out. Just another reason to use an ultrasonic cleaner on these things.

[1952henry]

Keep at it!