Re: {Chrysler 300} AFB carbs / Edelbrock

Apparently some early AFB have it some don’t ( odd—)

the new Holley Brawler series is very good too . All new design . I saw a test in HRM on 500”+ 460 Ford ( 600 hp!) where they had AF ratio sensors on all 8 pipes , it was perfect AF across all rpm and loadings right out of box no “calibration” of it at all . Guys doing test were amazed . Me too .

However Edelbrock falls onto AFB mounting throttle link etc with little trouble , can pick up advantages of electric choke too . AFB itself seems ok too , as an original , but now aware of possible bog stuff.

Electric choke is good .. I think — instead of exhaust heat hassles of all kinds .

That perfect A/F is because modern mfg tolerance and engineering design is so good with computerized fluid mechanics models , and the tight A/F pollution aspects , have driven carb improvements way beyond AFB accuracy , and beyond earlier fussy Holleys with 100 adjustments . Similar rationale, the Edelbrock AVS based “ thunder series “—they now push .. - I but have no direct experience there

On AFB one thing that happens a lot is the brass accell pump output check valve , under a small cover that you unfortunately have to take top of carb off to get to , seems to grow a white deposit in storage that makes it stick to zinc of carb , so no gas comes out of accell pump , car won’t start without spray , bog off idle etc etc

Have seen this 4 x past few years , i think related to ethanol . Pump leather / rubber or even fuel pump might get the blame , but you loosen the check working on it anyway ? Horse and cart thing , maybe .

Someone should make a delrin or nylon check valve ..

Although we don’t deal with it , our carbs all run lean now due to ethanol in high test , as that mix requires a somewhat richer AF ratio , so more gas flow than real gas ( how that improves pollution - by lowering the gas mileage — escapes me- you have to work for gov to understand such complex things) .

Today’s FI senses O2 and adjusts ..

Sent from my iPhone

On Jul 31, 2023, at 7:59 AM, dplotkin <dplotkin@xxxxxxxxxxxxxxxxxxx> wrote:

For those of you with original Carter built AFB note that rebuild kits sold today use a neoprene or similar accelerator pump when the original is leather.

These non leather pumps never work as well and usually present a stumble that even an adjustment won't fix. There is a guy in the Corvette world, I'll find him, who sells a kit with the leather pump.

On 10 cars I've got at least 1 of every US carb built. The AFB, but for drying out too fast is the best carb ever devised for big cars.

Danny Plotkin

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Bob Merritt <bob@xxxxxxxxxxxxx>
Date: 7/31/23 6:11 AM (GMT-05:00)
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} AFB carbs / Edelbrock

The AFB was first used in late 1957 production Chryslers (not letter cars).

Here are pictures of my 57 Saratoga AFB compared to a 1966 version:

http://www.simplexco.com/auto/1957/57/57carb.html

Bob

On 7/30/2023 3:50 PM, John Grady wrote:
> Hi
> Quick question I ought to know myself but suddenly not sure .
> So 58 dodge 361 or 383 58 (?)—- I think it was first use of afb vs wcfb on mopar ? 300 E had 2 afb too
> So rebuilt it twice — once outside , once myself could find nothing really “ wrong” , terrible , repeatable bog when secondary opened . Cannot be fuel flow as no problem to 90 mph and we know bowls are full when sec first opens . Replaced pump anyway .
> Gave up and changed to 650
> edelbrock , ran perfect out of box , although yet to have high speed bog test , but seems fine .
> ( Larger diameter neck , FYI and a lower carb body — I found 1” neck extension and opened air cleaner bottom) Without 1” it hits choke linkages .
> So in doing this , afterwards I noticed the secondary air valve in the Edelbrock. ( described for the AFB in carter book too ) , but the carb I took off had no air valve at all , at first i thought missing (?) — aha- no wonder a bog — but close inspection reveals no place to even mount it , no shaft holes etc . Carb i took off had the normal progressive linkage to secondary too.
> So ? were early afb made without air valves ? . = gonna bog? Are all afb narrow neck ? or were some larger neck a little later ? I thought afb and Edelbrock the same thing , but obviously not , or there was a change in AFB design ~ 1962 , later ??
> Or I am just lucky and some kind of marine carb landed on my 383?
> comments welcome …
> john G
>
>
>
>
> Sent from my iPhone
>

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