Why does my Rebuilt Carb bog???

[Speedfreak]

Hi,

Picked up the correct carb off eBay, 4618S.   Seller said needed accelerator pump.  No problem, was going to rebuild it anyway.  Took it apart, acc pump did not look too bad, one float was off, everything else OK.   I put it together and am having this problem.   What am I missing.  This is not the first Carter I have rebuilt, not much to it.   Any ideas???

Tha

[bakerhillpins]

Did you just replace components or did you also make all the adjustments to the linkages, choke, etc?

When is the last time you checked/set your timing?

Could you provide a bit more of a description about the problem, when it occurs, what the engine does, if you work the throttle differently does it behave differently?

[Speedfreak]

Did you just replace components or did you also make all the adjustments to the linkages, choke, etc?

When is the last time you checked/set your timing?

Could you provide a bit more of a description about the problem, when it occurs, what the engine does, if you work the throttle differently does it behave differently?

Adjusted everything to specs, all clearances.   Car was running fine with the wrong carb, ,Edelbrock.   Timing has not been changed, 5 degrees as per specs.

Idles OK, when you hit it, bogs, almost to stalling, then recovers and drives fine.  Have to feather the gas to avoid this.   This obviously was the problem the seller had and assumed it was the accelerator pump, which I would have though so too.  But it isn't.  What other carb problem can cause this???

[Cooter]

Not saying this is YOUR problem, but you gotta watch those Evil-Bay carbs.  A buddy bought a set of Ebay AFBs for his '58 Plymouth. I went through them, cleaned 'em, blasted 'em, etc. Gottem back together and on the dyno, one would just shut down the engine from Starvation. Had a horrible stumble and recover thing going on.



Come to find out, the "Previous owner/tuner/hack" decided ALL AFB Venturies will interchange as they are the same carbs. WRONG. I found parts and pieces from at least three different size/makes of AFB carb in one of 'em. and SOME early AFB carbs have a weighted "Flap" in the rear similar to an AVS [Air Valve Secondary] carb. This was completely missing as well. Causing a massive over flooding [with air] condition upon stabbing it.

I'd be looking into the main metering circuit. IE: Venturies. Something sounds as if it's clogged causing the accl. pump to get enough fuel to engine.

[bakerhillpins]

I'm with Cooter on this one. Take a look at the innards and see if it's setup correctly. Here is a link to a set of Carter manuals that will tell you what parts should be on your carb from the factory. Pay particular attention to the #s on the venturis and what side they belong in.

http://www.tocmp.com/manuals/Carbs/Carter/Chrysler/1965-1979/

Also make sure the PO didn't put in the wrong jets or metering rods as the stock AVS rods/jets are made of unobtainioum now. I had to buy a trashed carb at Carlisle this year to get replacement parts for my 4640sa. See below:

http://www.dodgecharger.com/forum/index.php/topic,102682.msg1214096.html#msg1214096

If you find you need to move to AFB metering/jets make sure you match the thread specs on the jets and use the proper rod caps. There is more info in the link above.

[resq302]

Great link bryan!

[bakerhillpins]

Great link bryan!

   Happy it's useful 

[resq302]

I just printed all of it out at work.