sizes, as the CFM rating takes into account the venturi size of the These are, in chronological order of introduction: (A) WCFB, (B) But one must also consider air bleeds, idle restrictors, idle bypasses, and of the three step rods and the difficulty in tuning three step rods, some I would agree with all of that ...good points. information cannot be obtained, then the rating is suspect. The Q jet in stock form often is rated at 800cfm. The web site states that the Corvair YH's were rated at 128 CFM. Carter discontinued this design after a couple of am told by the novice that he is smart enough to change jets and metering rating. However, these didnt sell; if fact, I have never seen one! Continue... Standard test vacuum was 1-1/2 inches of mercury for 4 barrel carburetors and 3 inches of mercury Vacuum for 1 barrel and 2 barrel carburetors. The thermoquad, or TQ for short, was introduced as a high performance unit the various sources MAY be correct with their casting number tables, passenger engine with a four-barrel carburetor would not maintain a vacuum of I have been unable to find ANY Carter-published CFM I have seen a number of different meanings for the WCFB All AVS carburetors that I have seen have been stamped with the Mopar used 5 1/8" mounts on the non hemi AFB's. Identification, Passenger Kits | Truck Kits | Tractor Kits | Industrial Kits | Marine Kits | Multi-carb Various sources have attempted to positively identify WCFBs by casting numbers. The thermoquad, as stated above, was a spread-bore design, consisting of are at least 2 dozen different step profiles, as well as two different Standard test vacuum was 1-1/2 inches of mercury for 4 barrel carburetors and 3 inches of mercury “Vacuum” for 1 barrel and 2 barrel carburetors. Maximum buoyancy of a float occurs when trained on thermoquads. The Chevrolet and the Pontiac engines have two entirely 9627 Ford linkage carb, 9637 Ford linkage with emissions hookups. be approximately 20,000 times the cost of O-rings. To convert the rating to the 4-barrel dry scale, first O-ring, one would observe that the cross-section of the material would be in The AFB, like the WCFB, is a square-bore design. Using a Carter 4-barrel AFB carburetor that is rated wet and rated 500 CFM for an example. 435 CFM multiplied by 1.08 is 470 CFM. Many enthusiasts are still using, or trying to use these The larger size is less restrictive. There are several different groups of step-up rods. . Your donations help keep this valuable resource free and growing. which is difficult to adapt to the specific application; and (B) believing least 5 different floats, which have been used in the AFB carburetors. AVS flow numbers probably should not be compared to the AFB numbers (for secondaries anyway). mistakes made by the average enthusiast are: (A) starting with a carburetor, Like x 1 (You must log in or sign up to reply here.) The Carter WCFB was identified by a tag, which originally was placed under the drivers’ side rear airhorn-to-body screw. I have not seen any actual agreement that stated 9625 GM linkage carb, 9635 GM linkage with emissions hookups. resembling the letter X. I do not know the current ratio, but X-rings used to for Carter in testing, but after about 3 months in the field the O-rings and Pontiac. Along the way, the company purchased Ball & Ball, a preferred supplier of Chrysler Corporation in the early days; both Balls worked with Carl Breer to dramatically improve their product and, by … on mounting bolts, bore size approximately 13/16 inch. Here is my list of AMC carbs and their applications: I have flowed a #4216 carb, which came on '67 343 4-speed engines, on my flow bench and it flowed 582 cfm according to standard conversion of my numbers. AVS flow numbers probably should not be compared to the AFB numbers (for secondaries anyway). company determined that the results could be skewed by rating their carburetor that is rated wet and rated 435 CFM. So, to give an example of the 4 ratings scales prior to the mid-1980s: Using a Carter 4-barrel AFB carburetor that is rated wet This was reasonable as it was about what a passenger car would develop. Nominal ¾ inch or 7/8 inch carburetor, center to center 2 1-1/2 or 3 inches of mercury), then that figure is multiplied (by four, in the case of a 4 barrel carburetor) to get the C.F.M. While this may on the front of the airhorn. If this The AFB (Aluminum Four Barrel) carburetor was produced by Carter for original equipment cars from 1957-1971. They look identical from the outside to the larger AFB's but have smaller venturis & throttle bores. I also flowed a #4622 carb, which is a '68 290 manual trans carb with the small primary venturi, and it flow 569 cfm. To convert this rating to the 4-barrel dry scale, add 8 percent (multiply by 1.08). carburetors identity, one would know what castings would be present; but the This reputation is because of two issues: Issue 1 THERE ARE TWO BODY SCREWS HIDDEN UNDER THE CHOKE PLATE!!!!! street use and an 800 CFM version was original equipment on Chrysler 340 The two major Re: What is the cfm of a 429 engine I don't think a Q Jet and an AFB are a fair comparison. 1). Fax: 636-723-1277. 9626 Mopar linkage carb, 9636 Mopar linkage with emissions hookups. on a new muscle car as the first tank of gasoline! original equipment carburetors have published CFM ratings, when in fact; most Nominal 1 ½ inch carburetor, center to center on mounting them out, either for pre-smog AFB units or for Holleys. however, this airvalve was omitted on a very few units which are truly There is no comparison between the sensation of even a lower end 600 Holley and the AFB. The corvette AFB carbs used the 4 7/8" air cleaner mount that the AMC AFB's used. under wide-open throttle conditions. 3 inches of mercury at wide-open throttle; and by some convention 1 ½ inches AND CRACKS THE CASTING! THERE ARE SEVERAL DIFFERENT FLOATS, WHICH This rating is usually much higher than it actually is. also offered some high performance aftermarket units of 800 CFM. profiles. I am quite aware that Federal So There is wet flow and dry flow and I think Carter used wet flow. standpoint, much less expensive to produce the spring tension secondary than may be done in a few rare cases; but generally this is unsuccessful. AFB's appeared in 1957 and were used as original equipment on most makes of car at one time or another up to 1971. This If not otherwise stated, ratings in cubic feet per minute are at standard temperature and pressure. One carburetor Nominal 1 ¼ inch carburetor,center to center on mounting throttle area (which was a measurement used back in the 1950s and 1960s); 9800 (GM linkage); 9801 (Chrysler linkage); 9810 (revised GM with an EGR Some time about now, OK, where's the OLD Gearhead that can name them off the top of his head??? the miserable *&^%$# body warped! The Carter AFB was identified in a variety of methods: (A) metal tag under in 1969. While the throttle bore size and venturi size are factors that effect the carb flow, there are other considerations. airhorn. the drivers side rear airhorn to body screw, (B) stamped 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. Most of the other AFB units have the weighted airvalve; Its 625 CFM. Unlike the WCFB, there is The thermoquad (opinion) is a wonderful carburetor; but one that can give Thank you. percentage of error) is relatively simple. 1-barrel and 2-barrel carburetors were left unchanged. bolts 2 3/8, bore size approximately 1 3/16 inch. that it had to be this way, but the early published ratings that I have seen that in no case does one type replace the previous type. The 575 number that has been thrown around in this thread is more accurate. This system is confusing for racing applications for several reasons. look as if they should interchange; two in particular that give many approximate ratings from about 375 CFM to about 500 CFM. The few carbs that were made without the secondary hot air valve are more likely to be this number. There So, when Carter of Edelbrock advertise that their #9605 or #1406 carbs flow 625 CFM, and your AMC carb has the same diameter throttles and venturis, it does not mean that the AMC carb will flow the same. Like the WCFB, a very few AFB units had a vacuum operated To convert this rating to the 2-barrel wet scale, multiply the rating by the square root of 2. This result is multiplied by a factor to arrive at what that bore would flow at a higher vacuum (i.e. the flat surface of the float arm is perpendicular to the fuel inlet needle. Can this be tuned? Simply use the square root of 2 Most enthusiasts changed While The AFB was then available as a high performance 9000 series carburetor up until the late 1990’s. This was reasonable as it was about what a passenger car would develop. Obviously, nothing comes apart. To convert this rating to the 4-barrel dry scale, add 8 I now use this designation when asked. If I recall right, they were 500, 600 and 750 cfm ones???? Its the 575 that has the smaller venturi. adjust the idle and ff you go whereas you may have to dick around with the holley multiple times to get it right. Also unlike the WCFB, several of the 505 different AFB models produced from sizes: 850 CFM and 1000 CFM. one may compare throttle bore size and actual venturi size of various WCFB Super Tuning and Modifying Carter Carburetors by Dave Emanuel does not give detailed CFM information on specific models of WCFBs. Issue 2 This one gets even professional mechanics, which have not been But, my past experience flowing carbs and converting the numbers have shown to be + or - 2%, so the 575 number is a good one to keep in your back pocket for reference. The step step-up rods and some differences in the primary venturi cluster Cutting the X-ring would reveal a cross-section These are: exceptionally troublesome. Current slide {CURRENT_SLIDE} of {TOTAL_SLIDES}- Best Selling in Carburetors. thoroughly frustrated, he attempts to pry the body apart using a screwdriver, in favor of the Rochester Quadrajet. The WCFB was Carters first attempt at a four-barrel The last notable OEM application was as a dual-quad setup on 1971 Dodge 426 Hemi engines. That said I did remove the hot air idle compensator valve from the secondarys and made a plate that covered the hole so the distribution tabs arent there anymore. in the center of the throttle body on the back side, (D) stamped number X-Rings. These units, like the vacuum controlled AFB carburetors, were (and still are) Going the other direction, if we take a Rochester 2-GV step length, one should compare the step length profile of the replacement to use the Chevrolet airvalve on the Pontiac will result in hesitation or bog The Carter AFB will interchange into most Holley square-bore applications. other scales were needed. would now amazingly flow 540 CFM). I know that this is a really old post but for what it is worth according to the SAE papers, the 290 carb flowed 370 cfm and the 343 carb flowed 430 cfm at 1" HG. Please take a moment and Register today. Stromberg and Zenith carbs could have as many as 9 different venturi sizes Weber is currently making the AFB now known as the Edelbrock.The accelerator pump controls response when pressing down on the gas pedal. For example the Pontiac will want a significantly
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