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05-19-2020, 05:48 AM | #1 |
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Join Date: Apr 2011
Posts: 19
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Progressive vs. straight pull on dual Weiand intake
Someone please help me understand the benefits of using a progressive carb linkage vs. a straight pull linkage?
I'm installing a vintage Weiand intake with dual Stromberg 97's on a 59AB with a stock cam, standard bore, Edelbrock heads and tube headers. The Weiand intake manifold design places the carbs directly above the intake ports on the block, does this design require the use of a straight linkage pull on both carbs? Would a progressive linkage starve the front cylinders until everything is opened up? Is there any advantage to using a progressive linkage vs. straight pull on this configuration? Does anyone have experience with this particular intake manifold and are you running straight or progressive linkage? Any thoughts or suggestions are appreciated. Thank you, Jeff |
05-19-2020, 06:04 AM | #2 |
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Location: Solihull, England.
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Re: Progressive vs. straight pull on dual Weiand intake
Personally, with duals, nothing wrong with straight pull.
Trying to run progressive can lead to a world of hurt. Mart. |
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05-19-2020, 06:08 AM | #3 |
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Re: Progressive vs. straight pull on dual Weiand intake
You don't normally use a progressive linkage when two carburetors are involved for the exact reason you stated....the secondary carburetor's group of cylinders would be starved with negligible mixture flow. Two carburetors should open simultaneously and equally. Progressive set-ups work well in a 3 x 2-bbl set-up where the center carburetor opens first, with the two end carburetors beginning to open (together) as the throttle is progressively fed to increase the power level. When adjusted properly, all three carbs should end-up wide open simultaneously. DD
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05-19-2020, 07:57 AM | #4 |
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Re: Progressive vs. straight pull on dual Weiand intake
I have 2 cars running dual carbs, 97s on one and 81s on the other with straight linkage and they run fine. As Dick said, the only setups I have seen with progressive linkage have been with 3 carbs.
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05-19-2020, 08:18 AM | #5 |
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Re: Progressive vs. straight pull on dual Weiand intake
You can run progressive on a 2 carb slingshot intake but that´s about it on 2-carb intakes.
Question is as always why you want to do something...what is the goal...after that you descide on the aproach. Progressive is for when you have so much carbs that you loose flow and idle/low don´t work well because of that. Last edited by flatheadmurre; 05-19-2020 at 11:39 AM. |
05-19-2020, 08:20 AM | #6 |
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Re: Progressive vs. straight pull on dual Weiand intake
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Al |
05-19-2020, 09:38 AM | #7 |
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Re: Progressive vs. straight pull on dual Weiand intake
Although I am of the opinion that some specialized dual carb manifolds can be run with progressive linkage, that is definitely NOT one of them.
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05-19-2020, 02:19 PM | #8 |
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Re: Progressive vs. straight pull on dual Weiand intake
Dual Flathead intakes are not designed to run with any type of progressive linkage if you try your going to hate the results. However thats not my opinion just a fact as it relates to how the duals work. After tuning dozens of dual combinations the important detail is having both carbs tuned as close to each other as possible its actually easy to do using a vacuum gauge to set the idle mixture screws and unisyn gauge to set the throttle shafts so both carbs are pulling the same amount of air at idle engine speed.
Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
05-19-2020, 02:30 PM | #9 |
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Re: Progressive vs. straight pull on dual Weiand intake
Ronnie set up my Almquist dual intake, 2 chrome 97's, straight linkage on a 59AB.
He explained in detail what he did. Runs like gangbusters. Thanks again Ron. Paul in CT |
05-19-2020, 04:36 PM | #10 | |
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Re: Progressive vs. straight pull on dual Weiand intake
Quote:
Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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05-19-2020, 06:17 PM | #11 | |
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Re: Progressive vs. straight pull on dual Weiand intake
Quote:
We were just talkin' about Joe Friday last night! DD |
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05-19-2020, 07:30 PM | #12 |
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Join Date: Apr 2011
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Re: Progressive vs. straight pull on dual Weiand intake
Thank you for all the replies, I appreciate the input and will set it up accordingly.
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