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Need some advice on carburetor linkage... 4 Attachment(s)
Many of you have been following the Hot Rod Reverend chronicles and know that I replaced my Fordomatic with a 3 speed/OD setup. I have been very happy with the results. With the Holley I installed last year and some of the tuning I have gone through with the Y block this car has really "woken up" so to speak. Wild as it may sound, I just found out this week while tinkering under the hood while the family was in town that the carburetor's butterflies were ONLY GETTING HALF THROTTLE WITH THE ACCELERATOR PEDAL TO THE FLOOR. To be honest, this was something I did not thoroughly check for after switching linkages several years ago. The throttle response was so good even with the Edelbrock, top end was so good, I just assumed that the installation and travel of the pedal all the way through to the carburetor was just fine. I guess I never had anyone sit in the driver's seat with the pedal to the floor so that I could check the full range of motion.
Dummy me. I have had this thing up to 90 mph on the interstate and have always felt like she had more in her because the accelerator pedal was nowhere near floored, the carburetor very responsive, and the engine was just humming along. Not that I need to go any faster, but I would like to have things operating as they should concerning full travel on the carb butterflies. At any rate, I have attached some files of Ford's diagrams that will explain my setup and then also look to find the part(s) I need to get the linkage operating correctly. I have both of Ford's large parts manuals that show both the illustrations and the nomenclature. I have a 56 Ford 4 barrel Fordomatic accelerator assembly attached to a B intake. It looks very similar to the 57 model... The difference in the 56/57 parts I believe would be how the Fordomatic kick down rod attaches. For 56 there is a pin that an L shaped bracket fastens and for 57 there is a hole to receive a clevis. At any rate, what I did was to retain this assembly but place a bolt/nut to stop in the slot (indicated by the red circle) so that the assembly could continue to pivot and pull back the rod that attaches to the carb butterflies. Before I made this switch from auto to manual, this linkage was working just fine while attached to the original 55 pivot at the firewall. Obviously, the original application for the illustration would be the Holley/Ford 94's (2 barrel, 3 bolt base) that were common on 54-56 Y blocks. What I believe I need is a different firewall pivot like the one indicated below: EDIT: the "S" stands for Thunderbird - certainly do not need that one, nor would it match the holes on my sedan firewall. Granted, the illustration is for a 2 barrel, but I would think that with the different arm off the pivot (which looks to be much longer than what I have currently installed) a rod could be attached to this arm and then to the carb butterflies. I did check the part numbers out and as you can see from the listings, there are different variances on the part number (9725). Anyone have that correct pivot? - to the help the Hot Rod Reverend get a little more out of a hot Y block? :D |
Re: Need some advice on carburetor linkage... I can't help you with the part but I believe the part numbers highlighted are for a Thunderbird. If A stands for full size Ford and S for Thunderbird like it does in later years.
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Re: Need some advice on carburetor linkage... Hi Dan,
One thought is maybe the distance from the center of the throttle shaft to the hole where you connect the linkage on your Holley is a lot more than the original carb to the car. In that case, it would require more travel to get to WOT. Just a thought. Also, the engine probably still had good power because the rear barrels will start to open when the front barrels are just partially opened. Once you get to true WOT, you may be in for a pleasent surprise. Sal |
Re: Need some advice on carburetor linkage... Have you seen the responses on Y-blocksforever?
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Re: Need some advice on carburetor linkage... Paul - yes I did, and I just responded there. Thanks for your advice.
5851a - that's a "duh" moment from me, the S/W is the station wagon and the S stands for Thunderbird. I will edit the post. Sal - I will certainly let you know what happens, can't believe I made this kind of mistake. I guess since I was getting so much "seat of the pants" power I never thought to see if I was getting to WOT???? Looks like all I need to do is fabricate a simple bracket to align a rod to the accelerator pedal pivot so that it is perpendicular to the firewall and in line with the carb. |
Re: Need some advice on carburetor linkage... That is what I did
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Re: Need some advice on carburetor linkage... 3 Attachment(s)
These photos here - I was reminded why I used the Fordomatic assembly. With the way this arm sits parallel to the ground. I am definitely going to have to find a firewall pivot made for a manual transmission 55/56 Ford! :D
https://vimeo.com/495929285 |
Re: Need some advice on carburetor linkage... I see the small bolt and nut through the bellcrank.
I converted my 57 with the Ford-O-Matic to an Offy tri-power unit. I had quite a time figuring out how to get the linkage to work right. My thoughts are with you Reverend. |
Re: Need some advice on carburetor linkage... https://www.hotrodreverend.com/post/...ley-carburetor
an article and another video of the solution... |
Re: Need some advice on carburetor linkage... Good Job Daniel. Also, with the Holley, if you put the linkage rod to the carb in the hole that is lower on the carb throttle lever, it will require less travel distance at the carb to get to WOT.
Sal |
Re: Need some advice on carburetor linkage... 2 Attachment(s)
Shown below is the correct linkage for a 55/56 FYB S/T -
You have to be careful regarding the MPC Illustrations as they are usually generic giving the PARTS DUDE just enough info to find whatever in the TEXT SECTION. |
Re: Need some advice on carburetor linkage... Back from the ban I see! :D
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... sigh ... Restricted to company area and the EM club is just across the parade field is harsh and unusual punishment ... |
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Sal |
Re: Need some advice on carburetor linkage... Yes, welcome back.
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Re: Need some advice on carburetor linkage... Hope you aren't still sweeping the scrub parking lot.
Ben |
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Re: Need some advice on carburetor linkage... Great info but you were too late my friend - I already had it installed.
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