Carter AFB- good spray or not?

[Bundy]

I have a little bit of a stumble off the line and I removed the air cleaner to watch the spray from the primaries and it looks like it is just dribbling out intially.

What do you think?

http://s287.photobucket.com/albums/ll155/Bundy420/?action=view&current=P9050152.mp4

I'm hoping this is my issue!

 

[blankenship76]

Not to hijack your thread, I have a carter AFB carb in the rig I bought, I am wondering how these are for wheeling and overall performance. Sorry to hijack, just don't anything about this manufacturer, and didn't come up with anything in the search.

 

[Pa PITT]

Back in the day .. I'm really dating myself.. AFB's were all we'd run.. If they had a stumble .. 1st thing we did was either move the pump arm up into the 2nd hole .. Old AFB's had 3 holes ..in the acclerator pump arm it would respond faster in the 2nd hole. Rather in the outside hole ..no 3 .. I don't think I ever put one in the 3rd hole ..

 

[ol gray mare]

I'm still running an AFB. I understand they are the same as today's Edelbrocks. The acc pump sprays a mist on mine. It still runs great after 20 years, that is until I try to go on a very steep angle. I like the simplicity of a carb as opposed to the complexity of fuel injection. (does that date me Pappit?). I don't remember much about the 60's.....uhhh, smoke this spaceman...

 

[broncnaz]

Carters/edelbrock all the same. parts interchange. You need to have a decent squirt when the throttle is moved any amount. as was said try moving the linkage if that doesnt work you may just need a new acclerator pump assembly as the seal may be worn. its not hard for dirt to enter the accelerator pump area and tear up the seal.

 

[John Marinan]

Remove the squirter and nozzle assembly and clean each tube with a shot of carb cleaner.

 

[dalba4]

I was not able to solve my off idle stumble with a new accel pump, moving to different holes on the pump arm, cleaning the carb, or returning to 190 deg thermostat.

I went to a 500 cfm carter and that solved it.

Mine had something to do with air velocity through the primary ports of the carb.

I run a vacuum gauge in the cab, and I sorted out the ignition first.

I have a manual transmission so the stumble was hard to miss.

Also it is a very simple carb, which is why I choose it over the Holley or Qjet.

 

[bmc69]

Although the culprit can be the accel pump, of course, (all discussed above), I've found the biggest culprit affecting off-idle response to be the metering rod setup. Selecting a rod that has a smaller diameter on the tip step and/or changing the spring on the metering piston to the next stiffer color in the range works the charm in most cases..if the problem was not the accel pump.

And yes..The Edelbrock carb is simply the late 50s vintage design Carter AFB in shiny clothing, nothing more. One of the best carbs ever invented in my humble opinion.

 

[bmc69]

I was not able to solve my off idle stumble with a new accel pump, moving to different holes on the pump arm, cleaning the carb, or returning to 190 deg thermostat.

I went to a 500 cfm carter and that solved it.

Mine had something to do with air velocity through the primary ports of the carb.

I run a vacuum gauge in the cab, and I sorted out the ignition first.

I have a manual transmission so the stumble was hard to miss.

Also it is a very simple carb, which is why I choose it over the Holley or Qjet.

yup..a carb that is too large for the engine its sitting on can be a real PITA to get bog-free..

 

[broncnaz]

There good carbs if you only use them on flat ground. And I agree big carbs are harder to tune but the key is know how to tune them you can get about any carb to run on any engine if you tune it. acclerator pump nozzle size is reallly where pump tuning comes into play linkage adjustments dont usually make bogs go away. unless it was bogging due to the pump squirt being delayed.

 

[Bundy]

I'm gonna move the accelerator pumparm linkage and see if that affects it... then I'll take it apart and clean the nozzles.

the carb WAS running fine when I got it but after a rebuild it hasn't quite been the same so maybe I didn't set it up the same as it was before...

 

[broncnaz]

might want to double check the float level as well if its to low fuel will not get into the acclerator pump chamber.

 

[ol gray mare]

You might also make sure you put the vacuum advance hose on the correct inlet port. Mine is on the passenger side. I've made that mistake before with similar results to what you described.