carter afb problems...

[Knebel]

Sigh... i have some issues with my carter afb on my 360... again. Im actually ready to just get a holley or a thunder avs and scrap the carter but I dont really have the funds to do that right now.

To my problem, i had the carb tuned in well, very well actually, but for some reason it heasitates when taking off a stop now, that however gets better the warmer the engine is. Checked the accel. Pump and it gives a shot. Still i see a lean spot on the afr gauge when it happens. Then, i dial in the idle mixture to an afr of 14:1. Well, it wont hold it... i just drove my kids to school and the idle afr was fine, i shut the car off for one Minute, and on the drive home it never gets back to the idle afr i had set, its VERY lean and its not only the idle, it misses a bit while driving too. I have one of those 1" brown compound spacers for heat insulation. I dont know what to do with that carb anymore, i already had it off and cleaned thoroughly.

 

[Polara_500]

On the off idle stumble - try setting the cam for a bit more stroke, that'll help a bit. I also just changed the shooters for larger size ones and the combination of the larger pump shot with a larger diameter shooter really changed the engine's manners. Mild 360 w/Carter AFB. There should be a number on the top of the shooter that will tell you the diameter and there's a few other sizes available. Don't remember the exact changes I made but IIRC it was from the base 27 up to a 32.
Mike

 

[Knebel]

Hey polara, I got the pump shot increased by putting it in the linkage in the top hole. Sure enough got pulled over ...lol i guess that means it works good now. It also held the idle afr pretty good but im sure that was an exception... will keep looking out for it.

 

[C Body Bob]

Good advice Polara 500. If he continues to have a misfire at cruise speeds he might want to check the gaskets on the carb & spacer. I hope there was no silicone used

 

[Polara_500]

Glad I helped. Another thing you can do is to change out the metering rods, I forgot I also did that - used some from a strip kit I picked up, kept the same size for the cruise range but went one size smaller in the power band which makes the power range a bit richer. If you don't have a book for the carb, their manual has a chart in it that will help guide you on rod/jet changes and there's lots of rods available that'll let you make significant changes with minimal effort. (I think you can find the chart online, too.)
Mike