The original group of 16 covered MOST WCFB, AFB, AVS, and TQ their "price leader" models. You can read all the technical information about Rochester two-barrel carburetors right here. . Sherman, U. This carburetor was made in two base sizes. The model 4000 has been The start of the 1980 model year was virtually a carryover from the previous year. the dust cover (boot) covering the accelerator pump shaft. In 1995 Rochester became part of Delphi, which in turn became a separate company four years later,[1] and continues to manufacture fuel injection systems in Rochester, now part of General Motors Automotive Components Holdings- Rochester Operations. casting number 7F6, wore 2.11/1.77-inch valves, and had cavernous 111-cc combustion chambers. A number of carburetor companies While The 2G series lasted into the 1980's. "[9], The 2G (later 2GC and 2GV) carburetor, commonly called the 2 Jet, was introduced in 1955, and continued to be used on GM V8s until at least 1969. through 1937. Also, Rochester supplies replacement carburetors for Chevrolets from 1932. Unlike most other four-barrel carburetors, the Quadrajet has a drastically different sized primary and secondary bores. The part number of the carburetor will tell you things such aswhen it was built, and where it originally came from. If your carburetor reads 1708, it was built inthe 80s. "E" (electronic control module controlled) series of Quadrajets use a computer controlled mixture control solenoid that responds to electronic signals from the throttle position and oxygen sensors via the computer, ideal for precise fuel metering and allowing additional fuel under load. Chevrolet Quadrajet carburetors would have a 0, 1, or even a 2. show the Linkert model LD as replacing the Shebler model D, the models M and the Junior kit with common tools spanning all makes, and several different Parker Brothers marketed an aftermarket fuel valve which featured an Strombergs with the Goldberg cover are Although it was placed on many of thevehiclesChevrolet built from the 60s until the late 70s as well assome Chrysler products it still does not get the respect it deserves. Business Hours: Monday - Friday: 9am - 11:30am & 12:30pm - 5:30pm EST. Rochester made carburetors from 1932 into the 1990's for many of the greatest cars - General Motors products like 5-6-7 Chevies as well as Studebaker, Packard and others. It is good if you know how to tune it up correctly, the Quadrajet is highly efficient and reliable as a substitute performance mounted carburetor. routed the air/fuel mixture through a tube inserted into a chamber which was Rayfield carburetors were produced by the Findeisen & Kropf Company, The design was used for just one year. A major 4-jet guru is Doug Roe, who wrote a book 'Rochester Carburetors" with full information, rebuild tech, and performance tuning tech. Quadrajet carburetors built by Rochester through 1974, have numbers starting with 70, and beginning in the 1975 model year they have numbers starting with 170. The Rochester Quadrajet Carburetors are identified with the GM part number made of 7 or 8 digits.1.- The fourth digit identifies the exact production year of the unit.2.- The fifth digit indicates the carburetor model3.- The penultimate number in the unit is the division: 0, 1 and 2 are for Chevrolet, 4 is for Buick, 5 is for Oldsmobile and 6 or 7 are for Pontiac. founders, Frank Wheeler and George Schebler. Carter introduced the AFB 4-barrel which became one of the more successful Carter Carburetors built Quadrajet carburetors for GM cars from 1966 into the late 70s. When a 2GV carburetor was installed, a thermostatic spring was mounted to the manifold, and was connected to the choke valve via a linkage rod. gears synchronized, so then Rochester started selling the assembled pump in that had one on a running engine. seen only 2 of these, One of a number of different Marvel parts cabinets. business in the USA. The base plates are rebushed to remove excess wear from around the throttle shaft to stop vacuum leaks. referred to as a quadra-jet in many Rochester documents. The M after that, is a style/model type. was Ty Hughes, who is now teaching carburetors in a better world. quadra-jet. Another company, Chandler-Groves Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. Shown here is the bottom of the single booster extending well into the main primary bore. Please don't copy stuff from this site without asking; it may belong to someone! They contain many features that make them an excellent starting point for high-performance use. introduced in 1957 by Oldsmobile on the J2 option; but made famous by Pontiac Shop has an FAA license, we will not discuss the Holley aircraft carburetors, Copyright var date = new Date(); document.write(date.getFullYear()); [store_name]. When properly tuned, the Quadrajet is both an efficient and effective performing carburetor. 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Holley has produced carburetors for cars, Duff Engineering patent cutaway. The accelerator pump is a gear-driven diaphragm (center). Many Quadrajets have their fuel bowl plugs sealed with. could be attached directly to a carburetor, bypassing the fuel pump, to A Center punch and a sharp hacksaw blade are used to score and cut the front edge of the base plate. "Quadrajet Quickery II", in. Note list [citation needed] The electronic versions have a throttle position sensor that is mounted inside the carburetor body, actuated by the accelerator pump lever. the enthusiast wishing to change is the availability of the special adapter 1935 Carter Master Tool Kit. [citation needed] The "newest" Q-Jets were built for, and sold by Edelbrock. making 2-barrel carbs until 1955 when they introduced the 2G series, which Carter WGD used as original equipment on a few 1949~1950 Oldsmobiles, So, do not get alarmed if yousee a Carter-built Quadrajet with a Rochester part number on it. Tillotson cabinet. However, they did produce an interesting With the introduction ofComputer Command Control (CCC)on several GM vehicles, the Quadrajet was redesigned to accept electronic internal components, which offered more precise control over main-metering-system-reducing emissions and improving economy at part throttle. A dash control provided the operator a method to Wooden card file box from 1920. Carter also had and Pontiac. tray on each side, a pedestal where carburetors may be mounted, a tank for carburetor in the 1930's for Chevrolet, Ford, and Plymouth 6 cylinder The 2GC (right), came with an air-horn-mounted spring/pod that operated the choke. [8], In 1952 the Oregonian reported: "Automobile cigarette lighters produced by the Rochester Automotive products division of General Motors are tested to reach a temperature of 1400 degrees in no less than 10 and no more than 12 seconds. Some additional parts were cross references of carb numbers by model type, lists of kits and parts and service bulletins. Note the rotary throttle which is gear driven. Much of the material on this website is in the public domain and has no copyright attached to it. Stromberg started selling carburetors in 1909. Its last application was on the 1990 Oldsmobile 307 The very small float bowl/fuel chamber can result in fuel starvation in extreme high-performance situations, but can usually be traced to a fuel delivery problem to the carburetor, such as a weak fuel pump or a worn/rounded camshaft eccentric that drives the fuel pump lever. Juhacz rotary throttle carburetor. [10] In all, it was used in at least 125 applications, including the Brockway's inline six. As the engine warmed up, heat from the exhaust traveled througha tube that was attached to the exhaust manifold to the spring/pod assembly. "[7] Rochester also supplied Pontiac, while using the Power Jet name in the replacement market. This results in poor idle quality. Oldsmobile followed suit. A special timed port provided varying amounts of vacuum that increased proportionally with throttle angle to meter the varying amounts of exhaust gas that recirculated into the intake manifold.