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Re: Throttle Linkage
Dodgerbum #1390481 Wed Dec 30 2020 07:28 PM
Joined: Sep 2007
Posts: 431
R
'Bolter
Thanks, Martin.


It's a small world, but I wouldn't want to paint it.
Re: Throttle Linkage
Dodgerbum #1390512 Wed Dec 30 2020 10:54 PM
Joined: Dec 2020
Posts: 14
D
New Guy
Thanks for the information. I looked at Mother Truckers set up...I don’t think it would work for me based on the lack of clearance behind the exhaust and the block. The spring would not have the space needed...my exhaust is nearly touching the block.

I tired turning about the bell crank and running the spring back to the petcock....this did not work and the throttle would close appropriately


1953 Chevy 3100, 5-window
Re: Throttle Linkage
Dodgerbum #1390540 Thu Dec 31 2020 01:33 AM
Joined: Dec 2018
Posts: 774
F
'Bolter
You might use the later chevy compound springs (one inside the other )for a safety factor if one spring brakes you still have some return so it doesnt run off. Then maybe you can still get home !

Re: Throttle Linkage
Dodgerbum #1390560 Thu Dec 31 2020 02:44 AM
Joined: Dec 2020
Posts: 14
D
New Guy
Fixite- do you have a photo of the compound spring you can share?


1953 Chevy 3100, 5-window
Re: Throttle Linkage
Dodgerbum #1390563 Thu Dec 31 2020 02:48 AM
Joined: Apr 2005
Posts: 10,043
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
It’s nothing special, just a spring like you show with another smaller spring inside it giving a little more pull.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
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Re: Throttle Linkage
Dodgerbum #1390568 Thu Dec 31 2020 03:19 AM
Joined: Dec 2017
Posts: 972
D
'Bolter
This is how the spring is supposed to be installed. Also, Your spring is not the right spring so it may not have the correct tension. You may also need an additional spring as I mentioned, on the vertical throttle rod. Fenton use to make linkage for their intakes that had the tab already welded, to assist with the upper linkage rod.

Others have mentioned a spring for each carb. That works but if you are using the straight unadjustable rod and tab style linkage (like the offy intakes use) the carbs have to be set exactly the same in terms of throttle arm opening/position or they may not close, especially if one carb is open a bit more then the other. You need some independent adjustment for each carb and a tiny bit of slop in the linkage. Also, it’s easier to synchronize the carbs if they can be independently adjusted.

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4103BBA0-8ACA-461D-9CEC-BBBD27A45388.jpeg (203.66 KB, 125 downloads)
Last edited by Dragsix; Thu Dec 31 2020 03:22 AM.

Mike
Re: Throttle Linkage
Dodgerbum #1390618 Thu Dec 31 2020 02:16 PM
Joined: Mar 2005
Posts: 1,448
C
'Bolter
IMO a properly engineered linkage only requires 1 spring near the bellcrank regardless of 2,3, or 5 carbs. If you need more you are trying to hide shortcomings and stressing out the throttle shafts. Anybody see a spring in my setup?

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Picture 230.jpg (172.86 KB, 127 downloads)
Picture 196.jpg (220.78 KB, 114 downloads)
Last edited by Curt B.; Thu Dec 31 2020 02:17 PM.

1952 1300 Canadian 1/2 ton restomod

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Re: Throttle Linkage
Dodgerbum #1390644 Thu Dec 31 2020 04:12 PM
Joined: Dec 2020
Posts: 14
D
New Guy
Curt, can you send a photo of your bell crank spring set up?


1953 Chevy 3100, 5-window
Re: Throttle Linkage
Dodgerbum #1390647 Thu Dec 31 2020 04:42 PM
Joined: Mar 2005
Posts: 1,448
C
'Bolter
I don't have a picture of that area but there is nothing custom about it. Mine looks like the pictures posted by Phak...there's a tab on the vertical rod for one end of the spring and another tab on an oil pan bolt for the other end. Good luck.


1952 1300 Canadian 1/2 ton restomod

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Re: Throttle Linkage
Dodgerbum #1390694 Thu Dec 31 2020 08:56 PM
Joined: Mar 2005
Posts: 1,448
C
'Bolter
This thread sure reminds me of the struggles I had trying to make a rigid linkage work. It kept me awake at night until the following criteria came to me when designing a solution.

My food for thought on this is specific to multiple rochesters on a Stovebolt and not other applications.

1. The accelerator return spring would ONLY have that function and have NO influence on the carburetors whatsoever.

2. The only pressure on the carbs idle stop screw would come from the internal pump spring and free from influence from an external spring, bolt, or other means. The linkage should lift it just as your finger would with no stress.

Accomplish these goals and it’s a zero maintenance item.

Happy new year bolters


1952 1300 Canadian 1/2 ton restomod

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