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Old 11-21-2011, 03:03 PM   #1
hardtimes
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Default throttle linkage Q..

Evidently, a lot of Model A owners utilize downdraft carbs. I'm asking questions regarding your linkage design/fabrication setup, because I'm always looking for improvements. Is there any source that fabs/sells such custom/professional linkage..or are you on your own in this endeavor? The stock model a linkage just is not designed for downdraft. Pictures of your successful fabrication would be great to share.
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Old 11-21-2011, 04:05 PM   #2
CarlG
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Default Re: throttle linkage Q..

The linkage for my Weber downdraft came with the "kit" -- Carb, Filter, Manifold & Linkage. Plug & Play!
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Old 11-21-2011, 04:13 PM   #3
Charlie Stephens
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Default Re: throttle linkage Q..

There is a lever that mounts to a threaded boss on many manifolds. You could fabricate one but a cast one that looks good used to be carried by Sacramento Ford Parts, vintageford.com.

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Old 11-21-2011, 04:58 PM   #4
miss victoria
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Default Re: throttle linkage Q..

linkage and manifolds on ebay go to model a ford weber carb manifold / linkage. item#280774211472 and 280774211001

Last edited by miss victoria; 11-21-2011 at 05:09 PM.
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Old 11-21-2011, 10:22 PM   #5
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Default Re: throttle linkage Q..

Quote:
Originally Posted by Charlie Stephens View Post
There is a lever that mounts to a threaded boss on many manifolds. You could fabricate one but a cast one that looks good used to be carried by Sacramento Ford Parts, vintageford.com.

Charlie Stephens
I'll check out these leads.
Also wondering if anyone has tried to use or thot about using a '32 four cylinder 'cowl' mounted 'spoon' pedal setup. It is long and brings the actuating arm fully across the cowl to an area parallel to the downdraft carb throttle actuating arm?
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Old 11-22-2011, 10:42 PM   #6
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Default Re: throttle linkage Q..

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Quote:
Originally Posted by hardtimes View Post
I'll check out these leads.
Also wondering if anyone has tried to use or thot about using a '32 four cylinder 'cowl' mounted 'spoon' pedal setup. It is long and brings the actuating arm fully across the cowl to an area parallel to the downdraft carb throttle actuating arm?
What are you trying to accomplish? The throttle assembly where it attaches to the rod going to the carburetor ends up in the same place on a Model A and Model B. What are you working on? If it's an A or B just use the pedal assembly designed for the car. Post if it is something else like a home built speedster.

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Old 11-24-2011, 12:12 AM   #7
hardtimes
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Default Re: throttle linkage Q..

Quote:
Originally Posted by Charlie Stephens View Post
What are you trying to accomplish? The throttle assembly where it attaches to the rod going to the carburetor ends up in the same place on a Model A and Model B. What are you working on? If it's an A or B just use the pedal assembly designed for the car. Post if it is something else like a home built speedster.

Charlie Stephens
Charlie,
I am working at getting "full" pedal and easily on the assembly that is pictured.
Presently, with floor mat/backing and original foot pedal linkage, I'm getting about half throttle. As pics show the linkage, as configured, does not have sufficient travel with foot pedal to flr mat ...for other end to open carbs fully. In other words there is insufficient travel of (pictured) right end of (STOCK) throttle linkage. Bending won't help anything. I think that it's a matter of leverage...that is , end of stock link is too short
And, this setup is not parallel, but downward pointed. Whereas, I think that the '32 that can be mounted on cowl (as on '32) can eliminate the intake mounted manifold lever (bellcrank) and be connected , via rod directly to carb.
Make any sense and or suggestions from what you see??
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Last edited by hardtimes; 11-25-2011 at 02:02 PM. Reason: add...
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Old 11-24-2011, 01:14 AM   #8
Geo. H
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Default Re: throttle linkage Q..

You're probably going to have to custom make what you need. Problems I see are too low of a pivot on your manifold, and exhaust header interference. I don't see where the 32 pedal would help.
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Old 11-24-2011, 10:12 AM   #9
1931 flamingo
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Default Re: throttle linkage Q..

What if you put the top of your verticle arm on the bottom?? Or make a new verticle arm altogether??
Paul in CT
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Old 11-24-2011, 02:38 PM   #10
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Default Re: throttle linkage Q..

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Originally Posted by Geo. H View Post
You're probably going to have to custom make what you need. Problems I see are too low of a pivot on your manifold, and exhaust header interference. I don't see where the 32 pedal would help.
No header interference...that is, appears closer in pic than is.
Pivot point is valid question ! thanks...Yeah, custom mabe it,eh?
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Old 11-24-2011, 02:42 PM   #11
hardtimes
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Default Re: throttle linkage Q..

Quote:
Originally Posted by 1931 flamingo View Post
What if you put the top of your verticle arm on the bottom?? Or make a new verticle arm altogether??
Paul in CT
Good ideas , thanks !

Hmm, where's that fab guy (bchoppit??) mabe he has some fab input


Anyway, happy turkey day to all youse fordbarners and family today !!
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Old 11-24-2011, 03:08 PM   #12
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Default Re: throttle linkage Q..

the stock foot pedal wants to push & the carb wants to be pulled . the bell crank changes the pedal motion to a pull . build a flat aluminum lever ( 1x1/8") & attache it to the manifold , but leave a space so it will move freely . make it about 10" long & drill holes for the pivot & linkage to bolt to . drill the pivot hole about 4" from the bottom , then drill one hole at the bottom & top . use the linkage ends that snap over a ball (like on your stock pedal) .
i had to bend the linkage to get around my header on the bottom . also i bent the top (above the pivot hole) to match up with the carb . depending on how far your pedal will push the bell crank will determine the length of the rods ......... clear as mud ? .. steve
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Old 11-24-2011, 11:22 PM   #13
hardtimes
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Default Re: throttle linkage Q..

Thanks Steve! I got your pics and will study your creation !
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Old 11-25-2011, 01:33 PM   #14
model.A.keith
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Default Re: throttle linkage Q..










Work in (slow) porgress..........the aim is to get the 'bell crank' vertical.....and shorten the control rods to length, using a threaded bar set in the middle of each rod........as i said slow progress at the moment.



keith


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Old 11-25-2011, 02:25 PM   #15
2935ford
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Default Re: throttle linkage Q..

Here is a system I used on a single downdraft. It was an Ansen intake w/header all from Red's Headers. He still carries them.
Worked very well.

Last edited by 2935ford; 06-30-2020 at 08:23 AM.
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Old 11-25-2011, 02:33 PM   #16
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Default Re: throttle linkage Q..

Here is the same car different motor dual downdraft setup (similar to yours).......still using the stock pedal arm.

Also looks like you need to turn your arm so the two holes are at the bottom.

Last edited by 2935ford; 06-30-2020 at 08:23 AM.
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Old 11-25-2011, 04:21 PM   #17
hardtimes
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Default Re: throttle linkage Q..

Quote:
Originally Posted by 2935ford View Post
Here is the same car different motor dual downdraft setup (similar to yours).......still using the stock pedal arm.

Also looks like you need to turn your arm so the two holes are at the bottom.
2935 ford,
Your second pic is a bit blurry to my ole eyes, but it kinda confirms what an early conclusion ...that I've come to, that is- that the SLANTED LINKAGE in your first pic , in my pic and in several other pics that guys have sent me is WRONG ! You are correct, I believe, that my bellcrank is not correctly positioned. BUT this bellcrank is NOT going to correct the problem like your SECOND pic linkage has corrected it! Your improvised bellcrank shows horizontal/parallel linkage and more correct use of mechanical leverage...thanks for your ideas/input
Anyone got something better...please show is a pic
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Old 09-12-2020, 11:58 AM   #18
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Default Re: throttle linkage Q..

with Stromberg Bullet ends, thread your own custom length rod. Secrets of Speed has a diagram on building an easy linkage
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Old 09-12-2020, 05:12 PM   #19
john in illinois
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Default Re: throttle linkage Q..

I just fabbed up a flat arm and put different spaced holes on each end. It is just a ratio you are looking for.

John
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