Mechanical secondaries
09-27-06, 03:44 PM
#1
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Mechanical secondaries
Im trying to follow the pictures about using a zip tie for mechanical secondaries.. but the thing the tab is supposed to be connected to isnt even moving when i rev up.. is something different on mine, or am i complete idiot who cant follow simple instructions?? 
09-27-06, 04:57 PM
#3
in the other thread you started the guy told you to zip tie two things together so they move. Is that the thing you are supposed to be zip tying?
Maybe to the first throttle thats down lower in your picture.
Maybe to the first throttle thats down lower in your picture.
09-27-06, 05:36 PM
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I didnt start the other thread, but i took his pic of a "functioning" setup.. so in the pic its correctly set up, but in MINE the circled thing is not moving like its supposed to.. some linkage must be not connected..
Is there anywhere where I can get a detailed diagram or information about this carb?
Is there anywhere where I can get a detailed diagram or information about this carb?
09-27-06, 09:05 PM
#5
I recently rebuilt my carb, so I'll chime in.
First, are you doing this with the engine runnig? That tab wont begin to move until at least half throttle. Have someone sit in the car and fully depress the accelerator with the engine off. The tab should begin to move at half throttle, and reach the end of its travell at full throttle. If you tied thinges right, the whole mess will move together.
If it really isn't moving than things get complicated. Below are a pair of pictures I just took of my unmodified carb, on the engine.
As you can see, they were taken through a mechanic's mirror, so they are a mirror image of the actual arangement. The image on the left is the linkage just before the secondaries begine to open (about half throttle), and the image on the right shows them begining to open. The system works like this.
Once the primarys are about half open, the arm on the primary throttle shaft, labeled (A) in the images begines to move down. This causes the disk, (B ) to turn clockwise in the image (counter clockwise in reality). The two are linked by connecting rob (C). Disk (D) which is the part that actualy turns the secondary shaft, doesn't move. The secondary shaft is actauly turned by the vacuum unit. The purpose of disk (B) is simply to limit the movement of disk (D), and thus the secondary shaft, until the primarys are at least half open. By tying (B) and (D) together, you cause the linkage to actualy push the secondarys open.
If (B) doesn't move, the connecting rod (C) may be missing or disconected at one end. Use a mirror to check. If it is, you'll have to remove the carb to fix it. This area is completely in accessable with the carb on the engine.
First, are you doing this with the engine runnig? That tab wont begin to move until at least half throttle. Have someone sit in the car and fully depress the accelerator with the engine off. The tab should begin to move at half throttle, and reach the end of its travell at full throttle. If you tied thinges right, the whole mess will move together.
If it really isn't moving than things get complicated. Below are a pair of pictures I just took of my unmodified carb, on the engine.
As you can see, they were taken through a mechanic's mirror, so they are a mirror image of the actual arangement. The image on the left is the linkage just before the secondaries begine to open (about half throttle), and the image on the right shows them begining to open. The system works like this.
Once the primarys are about half open, the arm on the primary throttle shaft, labeled (A) in the images begines to move down. This causes the disk, (B ) to turn clockwise in the image (counter clockwise in reality). The two are linked by connecting rob (C). Disk (D) which is the part that actualy turns the secondary shaft, doesn't move. The secondary shaft is actauly turned by the vacuum unit. The purpose of disk (B) is simply to limit the movement of disk (D), and thus the secondary shaft, until the primarys are at least half open. By tying (B) and (D) together, you cause the linkage to actualy push the secondarys open.
If (B) doesn't move, the connecting rod (C) may be missing or disconected at one end. Use a mirror to check. If it is, you'll have to remove the carb to fix it. This area is completely in accessable with the carb on the engine.
Last edited by DogBox; 09-27-06 at 09:14 PM.
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