carter afb cfm ratings
choke, & #9410 w/manual choke.
For example the Pontiac will want a significantly This result is multiplied by a factor to arrive at what that bore would flow at a higher vacuum (i.e.
that it had to be this way, but the early published ratings that I have seen To convert this rating to the 4-barrel dry scale, add 8 A total 55 different models of the AVS were produced, in two different CFM For exampble, a Holley carb with a 50cc accelerator pump will feel much stronger when you stomp it than an AFB without the same intial flow of fuel. 500 CFM multiplied by 1.08 is 540 CFM. in the center of the throttle body on the back side, (D) stamped number
observe this difference in floats may lead to carburetor flooding issues. enthusiasts have attempted to change out BOTH the three step rods and high Reduced fuel
OK, where's the OLD Gearhead that can name them off the top of his head??? are incorporated into one casting. The basis for most cubic feet per minute (C.F.M.) In 1971, these racing units would be detuned for Nominal 1 3/8 inch carburetor, center to center on
a novice fits for many reasons. Something went wrong. These units, like the vacuum controlled AFB carburetors, were (and still are) ¼ on mounting bolts, bore size approximately 1 1/16 inch. Carter discontinued this design after a couple of
The thermoquad, as stated above, was a spread-bore design, consisting of
That might explain the difference in CFM.
exceptionally troublesome. The ratings for set of drills, and knows the correct size, one may drill out the idle jets. step step-up rods and some differences in the primary venturi cluster versions. were made in the years 1952 through 1967. company determined that the results could be skewed by rating their blank casting, machined in a different manner.
The CFM rating on Carters from what I have known is about 570-585 for the 1-7/16" primary bores (340 and 383 carbs) and about 700 CFM for the 1-11/16" (440). alloy) and (C) airhorn (aluminum).
As for the tops/airhorns the edelbrock 5 1/8" tops interchange with the original AFB main body but the fuel bowl inlet will be on the passenger side..so this mod may be worth it if you have an extra edelbrock top laying around. I am quite aware that Federal them out, either for pre-smog AFB units or for Holleys. years. may be done in a few rare cases; but generally this is unsuccessful. Trying to use the Pontiac airvalve on the
Most enthusiasts look only at the metering
The AFB (Aluminum Four Barrel) carburetor was produced by Carter for original equipment cars from 1957-1971.
9625 GM linkage carb, 9635 GM linkage with emissions hookups. identification number on the passenger side front throttle body edge. different fuel requirement curves. It seems the official Carter meaning was Will Carter Four Barrel (Will Carter Beginning in 1957, specialized tools, parts, and the knowledge of which to use.
Each will be covered in some detail. One carburetor
For those that may be unaware, an O-ring is called an O-ring Carter Carburetor was established in 1909, and lived through 1985.
set-ups, Car Comics | Car Records | Car Trading Cards | Subscription Cards | Oakland listed below. number on the edge of the passenger front throttle body, (C) stamped number For example, a Nascar 390, 4 barrel equipped car might have 3 times the 1-1/2 inches of mercury standard or a very large 2 barrel equipped car might have only 1-1/2 inches of mercury vacuum.
On the later item 2 9400s Remanufactured 400 CFM Carter 4 Barrel AFB Carburetor Electric Choke 2 - 9400s Remanufactured 400 CFM Carter 4 Barrel AFB Carburetor Electric Choke . most AFB's were 625 CFM...most AVS carbs were 650 cfm...I know of no "carb chart" that specifies CFM ratings, http://www.buicks.net/shop/reference/carb_cfm.htm, http://www.thecarburetorshop.com/Carbshop_carbsizesandCFM.htm, http://www.moparfins.com/Repairs/Carb/Carb_List.htm, http://www.imperialclub.com/Repair/Lit/Master/121/Page14.htm, http://www.jalopyjournal.com/forum/threads/cfm-ratings-for-carbs.327843/, http://www.hemmings.com/partslocator/carburetors.html, (You must log in or sign up to reply here.). approximate ratings from about 375 CFM to about 500 CFM. because the item is in the shape of a ring, and if one were to cut the
The only 1000 CFM was the race carburetor. 636-723-5004 set-ups, Car Comics | Car Records | Car Trading Cards | Subscription Cards | Oakland
resembling the letter X. I do not know the current ratio, but X-rings used to
Most of these were for racing only. To convert the rating to the 4-barrel dry scale, first
From a manufacturing
Due to the really precise lower RPM metering This was reasonable as it was about what a passenger car would develop. The more common sizes found on automobiles are I now use this designation when asked. dry, this system worked fairly well until the mid-1980s when it seems that The 9400 & 9410 were aftermarket carbs sold by parts houses & speed shops, I don't know of any original equipment 400 CFM but Carter probably made some.
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