| jehn | -- 04-26-2017 @ 5:19 AM |
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I wish to know if there is differents linkage rods if I use a Stromberg 97 carb or a Ford model 59 carb? As I can see it seems to be different lenght of the rod depending of which carb I use.
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| ken ct. | -- 04-26-2017 @ 7:12 AM |
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I've used both stroms and ford carbs with the same rod on both no problem on 36 coupe. There are several diff lengths o the market
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| ken ct. | -- 04-26-2017 @ 7:32 AM |
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I just measured mine which fits fine on either carb. OFF the linkage on both ends measures 10.5 " connected @ carb and firewall arm measures just shy of 11" The 2 ball ends add just shy of a 1/2" to the installed. Depends on how worn the 2 1/4" balls are. Hope this is clear as mud. ?? ken ct.
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| Don Rogers | -- 04-26-2017 @ 2:00 PM |
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Jehn, The length of the rod depends upon many factors including the firewall design and its distance to the carb, as well as the accelerator linkage. I am attaching a drawing that I made showing a few of these lengths. Don Rogers
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| jehn | -- 04-27-2017 @ 12:17 PM |
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Thanks everybody for feedback. At the moment I use a Stromberg 97 carb and the rod is about 10 1/2" from end to end. The other day I tried with a Ford model 59 carb and the rod was to long and should be about 9 1/4". I have seen that different rods are available but no one about 9 1/4". My car is an -41 Bus Coupe. This message was edited by jehn on 4-28-17 @ 12:14 AM
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| TomO | -- 04-29-2017 @ 7:28 AM |
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Jehn, The correct rod length for the 41 Ford is 10. 44 according to Don Roger's chart. The original carburetor would have been a 91-99 which has the same dimensions as the model 59. Could you post a photo, so we could make a better guess as to why the 10.5 rod will not work? Was this car imported from the USA? Tom This message was edited by TomO on 4-30-17 @ 8:49 AM
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| jehn | -- 05-02-2017 @ 1:51 PM |
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I apologize for late respons TomO. For the moment I have the Stromberg carb on so I can't get a relevant picture showing the rod and the Ford 59 carb. Yes Tom, the car was imported from your country and has a 59AB engine.
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| TomO | -- 05-03-2017 @ 6:42 AM |
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Jehn, a photo of the stromberg and the linkage would be a good start to help us see what may be wrong. Tom
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| ken ct. | -- 05-03-2017 @ 7:58 AM |
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On my 36 I can use the same rod for the 94 or Strom carbs/ Maybe PO bent the carb lever at the carb. The 10.5 one should fit either one. ken ct.
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| jehn | -- 05-04-2017 @ 12:50 AM |
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For the moment I am out of my country. I will be back when I am at home again. Thanks for all engages and trying to help me.
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| jehn | -- 10-18-2017 @ 1:52 AM |
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Back to my linkage problem. Here is a pic showing that the 10.5" is about 0.5" to long when using the 59AB carb. This message was edited by jehn on 10-18-17 @ 1:54 AM
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| ken ct. | -- 10-18-2017 @ 2:36 AM |
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Put a bend in the rod , that will make it shorter. Easy fix. ken ct
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| jehn | -- 10-18-2017 @ 5:27 AM |
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Yes of course I can do Ken, but I want to know why it not will work on my car. Somebody says it will be the same linkage rod for different carbs and that's why I want to know about it.
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| TomO | -- 10-18-2017 @ 6:13 AM |
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Jehn, If you photo is when the accelerator pedal is all the way up, your rod should work. There is supposed to be tension on the carburetor accelerator linkage when the engine is idling. To install the rod, just push it back while holding the spring loaded end and then slip it over the ball on the carburetor. Tom
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| fordv8j | -- 10-18-2017 @ 6:22 AM |
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I had that problem with my 38 conv. coupe, finally had the rod cut and shortened and welded, filed it down and polished, couldn't tell it
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| jehn | -- 10-18-2017 @ 10:31 PM |
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Tom, of course I have tried to connect the rod to the carb but the result is a very high idle rpm and that's the problem.
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| jehn | -- 10-18-2017 @ 10:45 PM |
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Fordv8j, I see you had the same problem. I have been thinking about to cut the rod to the right lenght and then join with the Ford part choke & throttle joint (91A-9702).
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| 40cpe | -- 10-19-2017 @ 7:23 AM |
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The rod being too long wouldn't cause it to idle high. It is obvious that the too long rod will just put more pressure to the closed position of the carburetor. If anything, it would prevent full throttle opening.
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| TomO | -- 10-19-2017 @ 7:48 AM |
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When you press on the accelerator pedal, the rod should travel towards the rear of the car, pulling the throttle open. When you release tension on the pedal, the rod should travel to the front of the car applying pressure to close the throttle. If you look at your photo, you will see that rod travel towards the front of the car will close the throttle. Tom
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| jehn | -- 10-19-2017 @ 11:52 AM |
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My explanation about the idle rpm was not so good. What I should say is if I connect the rod to the carb the throttle get open without touching the accelerator pedal. This message was edited by jehn on 10-19-17 @ 11:58 AM
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| 40cpe | -- 10-19-2017 @ 12:17 PM |
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Are you saying that the car idles normally with the rod not connected, but idles too high with it connected?
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| jehn | -- 10-19-2017 @ 2:23 PM |
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The rod with the length of 10.5" (266 mm) will do too much pressure on the throttle without touching the accelerator pedal. Of course I can bend or short the rod to get the right length but why does it not work? As I know is there just two rods like these on the market, 10.5 and 10.75 and none of them seems to fit my application. This message was edited by jehn on 10-20-17 @ 1:10 AM
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| TomO | -- 10-20-2017 @ 9:47 AM |
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Jehn, your description is backwards of what should happen. The extra pressure on the throttle lever will keep the throttle lever at the idle speed adjustment screw. In the attached drawing, the blue outlines the linkage and the red arrows show the direction that the rod goes when the pedal is depressed. Is your linkage like the drawing? If it is not, could you please attach a photo of where the rod is connected to the accelerator shaft, showing as much of the accelerator shaft as possible. Tom
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| 40cpe | -- 10-20-2017 @ 11:32 AM |
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On 10/19 he said "My explanation about the idle rpm was not so good. What I should say is if I connect the rod to the carb the throttle get open without touching the accelerator pedal." Maybe what he is saying is that the rod being too long causes the accelerator pedal to be closer to the floor. Or maybe the idle screw is set too high on the 59 carburetor. It seems his real concern is why the rod fits one carburetor and not the other. This message was edited by 40cpe on 10-20-17 @ 11:33 AM
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| jehn | -- 10-20-2017 @ 11:51 AM |
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40cpe, you got the point. I apologize about my bad english but that's just what i mean. Why does the 10.5 rod fit on the Stromberg carb but not on the model 59 Ford carb?
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| 40cpe | -- 10-20-2017 @ 5:45 PM |
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You have both carburetors there in front of you. Put them side by side and compare the attachment point for the rod end with each other. Are they the same in relation to the butterfly shaft? Is one attachment point closer to the rear of the engine than the other one? The carburetors bolt in the same place, so the butterfly shaft should be in the same place on both.
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| jehn | -- 10-21-2017 @ 3:22 AM |
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40cpe, you gave me a clue. I have checked the butterfly shaft position before and did it again. The distance from the firewall is the same but the bulb on the butterfly shaft has a higher position on the Stromberg carb. That means that the carbs need different length of accelerator rods. See attached photo.
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| jehn | -- 10-24-2017 @ 12:35 PM |
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I have got the solution on my problem. I don't need to cut the rod, because I found a rod with the length 10-3/8 which is the right one for my application. Thank you everybody for trying to help me to find the solution.
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