The accelerator pump controls response when pressing down on the gas pedal. I will admit that idle adjustment can be tricky with this system if the user is trying to burn E Most enthusiasts think that these rods differ in metering diameters only; but this is totally wrong. If viewed from the throttle side of the carburetor, when the lower portion of the link is vertical, the upper portion will be leaning toward the rear of the carburetor. Obtain a 10 x 32 machine screw and spring at the local hardware or auto parts store. What causes a just above idle lean condition?
If one is to use a rod NOT specified by Carter in an original AFB , for best results, one should verify that the physical profile of the rod is the same. So the question is: Soaking in oil overnight probably has the leather swelled up past where it should be. Weber is currently making the AFB now known as the Edelbrock. Accelerator pumps do not necessarily fit tight in the pump well. Take a look at the Carter YF technical page. Each of these valves would have a different mass.
This article comoetition directed at some of the less-understood tunable facets of the AFB, plus a couple of tips. This is the little “S” shaped link that connects the accelerator pump rocker arm to the accelerator pump. I would appreciate any ideas you have to offer. The link is constructed with a bend in the middle. Ethanol will leave residue in the carburetor passage ways.
Some of the carburetors with more than 2 step rods had modifications to the primary venturi cluster to utilize the extra steps.
Carter AFB Competition Series 9605s 600 CFM Manual Choke 4brl Carburetor
The acceler ator pump There are four variables in tuning the AFB accelerator pump circuit. An example would be S. Sorry to bother you.
Additionally, Carter used carburegor number of different lengths of pumps.
Carter AFB Carburetor – Mikes Carburetor Parts
I recently purchased a leather accelerator pump for my Carter afb. Screw the idle air screw all the way in, and then adjust the idle the conventional way. The mass of the pump discharge valve will effect in milliseconds how soon the fuel from carteg pump actually enters the venturi once the pump is actuated. I noticed the Edlebrocks pump shot is substantially stronger and this is basically the same carb, perhaps they upgraded it at some point. Most enthusiasts think that these rods differ in metering diameters competution but this is totally wrong.
When properly installed, the link will resemble the letter “S” if viewed from the front, NOT a reverse “S”. No need to drill, as the idle air screw will do exactly the same function, and ckmpetition is adjustable.
I soaked the leather in 3 in 1 oil overnight and installed the new pump but am still a little unhappy with the pump shot. The accelerator pump controls response when pressing down on the gas pedal. For these carburetors, Carter produced hundreds of different step-up rods. We have had many carburetors come to us with weights ground almost to nothing, or chunks of lead screwed carbureetor the weights when the angle of the valves was incorrect for the application.
The operating volume of the pump squirt then would be the volume of fuel in the pump well displaced by the pump with a complete stroke. srries
You may find other numbers stamped on the carburetor, but they are usually the part numbers of the part they are stamped on. Again, since few enthusiasts have a large selection of the various airvalves, the easiest method of tuning is to start with the correct carburetor. There is a “dimple” in the lower casting on the front drivers side where the normal curb idle screw would be located.
One size or type does NOT work for all applications. Since everyone who works on AFB carburetors knows all there is to know concerning tuning the step-up rods, springs, and main metering jets; I will not bore you with explaining these. Take a look at the Carter YF technical page.
AFBs use mechanical secondaries. They made rods in 2 different overall lengths; but where things really get ticklish is the step length. None of the clones, regardless of what name may be on them, are considered here.
s Carter AFB Competition Series CFM 4 Barrel Carburetor | eBay
P ump link installation. The step length and taper are crucial to maintaining the “timing” of different metering levels and this is correlated with the tension of the step-up springs. My problem is a lean condition. If viewed from the throttle side of the carburetor, when the lower portion of the link is vertical, the upper portion will be leaning toward the rear of the carburetor. cometition
We also inform the owner which kit to purchase in the future that will contain the proper pump. The auxiliary airvalve One of the least understood issues of tuning the Carter AFB is the importance of the auxiliary airvalve.
Many serie rocks at the AFB ‘s with the idle air circuit the large screw between the two idle mixture control screws. I moved the accelerator pump rod down to the bottom hole, and this seemed to help some.
There are comptition lot of chemicals that do not play well with ethanol, so be careful. We still occasionally use this trick when preparing an original carburetor for racing. The metering rods are of a step design and are controlled by vacuum and metering rod spring action.