Find the adjustment screws on the front of the carburetor. Walbro carburetor hda491 exploded view parts lookup by model. Thanks to bruce osborn and jon hardgrove for their tips, and to ed wilson for editing the comments from the bulletin board. Rochester 2g carburetor venturi cluster gaskets carburetor. Delco rochester there are three basic model g rochester twobore carburetors. Richening the primary jets may give a better surge off the line, but if one goes too deep in jet size changes, the car will slow down. The varajet would serve all gm divisions see usage chart at the end using the 2. In this video, i demonstrate how to disassemble a rochester 2 jet 2 barrel 2g 2gv 2gc carburetor. The book will be a complete guide to selecting, rebuilding, and modifying the qjet, aimed at both muscle car restorers and racers.
Rochester products division rpd was a division of general motors that manufactured. Complete exploded views of all the major manufacturers. The q jet is a very capable but often misunderstood carb. Motorcraft 2700 7200 carburetor manual large file, but great manual. Rochester 2 barrel carburetor oem, new and used auto parts. That vehicle came with a rochester 2barrel carb, a rochester quadrajet carb, or a holley 4 barrel carb. For this model carburetor, the 316 inch screwdriver was used for the main and idle jet and the 18 screwdriver was used for the economizer jet. Charlie price vintage speed rochester 2g secondary tri power carb rebuild duration. Rochester bc published in 1951 rochester dualjet carburetor manual. Invincible extremes muscle cars garage 2,389 views 5.
Parts lookup enter a part number or partial description to search for parts within this model. Cm30 19561967 rochester 4jet for chevrolet and gmc. Cm107 19701990 rochester 2jet large bore 1 12 cm452 1956 oldsmobile 2g special. Finding the correct air and fuel mixture will help extend the life of your engine. Each assembly would have the letter s appended to the part number. These jets typically have a smaller jet size through hole than the main jet and pass air instead of fuel. Includes history, an explanation of how the carb works, a guide to selecting the right carb, how to rebuild the carb, and extensive descriptions of highperformance modifications that will help anyone with a qjet carb crush the competition.
If theres any fellow gear head who can give me some info id really appreciate it. The service procedures recommended by rochester products division and described in this. Figure 1 model 4mv figure 2 model m4m e general description the rochester quadrajet is a four barrel, two stage carburetor of down draft design. The quadrajet is a fourbarrel, twostage carburetor of downdraft design. Cm107 19701990 rochester 2 jet large bore 1 1 2 cm452 1956 oldsmobile 2g special. Rochester made carburetors from 1932 into the 1990s for many of the greatest cars general motors products like 567 chevies as well as studebaker, packard and others. The quadrajet is a fourbarrel, twostage carburetor of down draft design. Its first application was the newfor1965 chevy 396ci engine. Ive been searching high and low to find out the cfm rating on this particular carb and i cant find anything. The float system figure 2 consists of a fuel chamber. The rochester quadrajet carburetor was found perched atop the engine of many a classic gm performance vehicle. Cm485 195556 buick, cadillac, packard, pontiac rochester 4gc. Remove trip lever retaining screw at end of choke shaft and remove trip lever fig. This book, how to rebuild and modify rochester quadrajet carburetors, seeks to lift the veil of mystery surrounding the qjet and show owners how to tune and modify their carbs for maximum performance.
Models 2g, 2gc, 2gv service manual carburetor parts. To prevent from messing up the jets, you should grind down a screwdriver to make a square tip. How to rebuild and modify rochester quadrajet carburetors. To carburate or carburet and thus carburation or carburetion, respectively means to mix the air and fuel or to equip. The best place to start is to increase the primary jet size. Its last application was on the 1990 oldsmobile 307 v8 engine, which was last used in the cadillac brougham and full size station wagons made by chevrolet, pontiac, oldsmobile, and buick. The most common carburetor appearing on the cj3b is the number 938 4 variations 938s, 938sa, 938sc, and 938sd. Includes stepbystep overhaul instructions, theory of operation and troubleshooting. Rochester bc published in 1951 rochester dualjet carburetor rochester e2se carburetor rochester e4mee4mc service rochester monojet carburetor rochester triple power pack rochester quadrajet. Rochester dualjet 210 2mc m2mc m2me e2me e2mc carburetor parts. This book, how to rebuild and modify rochester quadrajet carburetors, seeks to lift the veil of mystery surrounding the q jet and show owners how to tune and modify their carbs for maximum performance.
The quadrajet is a four barrel carburetor, made by the rochester products division of general motors. Need diagram for 2 barrel rochester carburetor fixya. The qjet is a very capable but often misunderstood carb. This is a rochester dual jet carb that is being tested on a running engine. Supersedes 9d5 models 4mv4mcm4mem4m c dated may 1973. That vehicle came with a rochester 2 barrel carb, a rochester quadrajet carb, or a holley 4 barrel carb.
There is not enough time or space to post all of the information about this here. D ual elt carburetor models e2mee2mc the old car manual. I would recommend going to and subscribing to the service information for your vehicle for a small annual fee, or purchacing a manual like. It is sometimes colloquially shortened to carb in the uk and north america or carby in australia. As a single solution, or partnered with products from other holley companies we can give you the edge you need over the competition. Some of the most soughtafter rochester carbs are the tri power carburetors that used three rochester twojet 2g carbs on the oldsmobile j2 setup, 348 chevy, cadillacs. The trick is to start with the largest screwdriver that fits the jet. Service manuals index by carburetor manufacturer and model. Factory service manuals for all 19731990 two jet carburetors for cars and trucks.
Rochester twojet carburetor kits, parts and manuals. Often these look like flathead screws and you can use a screwdriver to turn them, adjusting the amount of. It has been proven to be dependable and a versatile performer as witnessed by its broad application and usage since its first introduction in 1965. Download manuals for carter, holley, autolite, motorcraft, rochester. Free carburetor repair manuals mikes carburetor parts. Factory service manuals for all 19731990 twojet carburetors for cars and trucks. Rochester 2 jet, 2g, 2gc carburetor rebuild part 2 duration. Walbro carburetor hda491 parts diagrams swipe swipe.
Rochester 2jet carburetor manual the old car manual project. Derek redmond elsewhere on the web, see the carburetor shop and old jeep carbs llc on, see also a number of pages of original carter yf carburetor service information return to tech tips on visit on facebook. Rochester 2g, 2gc carburetor manual rochester 4g, 4gc carburetor manual rochester aa carburetor manual rochester b, bc, bv, aa, bb carburetor manual be patient, this is a large file. Some classes of stock car racing need large rochester 2 jet carbs. Explicacion power jet carburador en espanol youtube. The procedures recommended by rochester products division of general motors and described in. File after bulletin gags delco carburetor trouble shooting the delco monojet m mv carburetor contd. For a baseline, increase the primary jet size in one jet size.
Inicio comunidad aportes rochester monojet service manual. Rochester 4g, 4gc rochester aa carburetor rochester b, bc, bv, aa, bb carburetor manual be patient, this is a large file. Rochester 2 barrel carburetor oem, new and used auto. How to rochester 2 barrel jet carburator accel pump clean and troubleshoot pontiac, buick chevy duration.
This is the delco rochester service manual for 2g, 2gv, 2gc and 2ge carburetors. I tried to give the best possible view that i could during the process, if you have any. There should be two screws on the front of the carburetor, which are used to adjust the air and fuel mixture. I had to run a switch controled wire for the choke, change the fuel supply a bit,and adapt the linkage. This main air bleed jet controls when the fuel jets are activated. If your engine is running too rough, its important to adjust the mixture and find the correct idling speed to decrease engine. Rochester 2 jet identification q discussion in the hokey ass message board started by scott, nov 19, 2009.
Cm30 19561967 rochester 4 jet for chevrolet and gmc. The rochester 2gc carburetor incorporates the calibrated. Below the venturi is a butterfly valve called the throttle valve a rotating disc that can. Solex 44 phh carburetor testing testing a set of carburetors.
Download manuals for carter, holley, autolite, motorcraft, rochester, stromberg, solex, marvel schebler, zenith carburetor manuals the adjustment of the solex carburettor consists in. A carburetor consists of an open pipe through which the air passes into the inlet manifold of the engine. Sep 02, 2017 explicacion power jet carburador en espanol. Solex carburetor selection and tuning pdf download. Carburetor installation and tuning ultima products. Some of the most soughtafter rochester carbs are the tri power carburetors that used three rochester two jet 2g carbs on the oldsmobile j 2 setup, 348 chevy, cadillacs. This series of 2 bbl rochester dualjet 210original equipment for 1980 gmc sierra.
Edelbrock performer series 750 cfm carburetor with manual choke. Mar 08, 2017 this is a rochester dual jet carb that is being tested on a running engine. A carburetor american english or carburettor british english is a device that mixes air and fuel for internal combustion engines in the proper airfuel ratio for combustion. This book, seeks to lift the veil of mystery surrounding the qjet and show owners how to tune and modify their carbs for maximum performance.
The larger the air jet is the greater the air velocity through the venturi must. The 2g later 2gc and 2gv carburetor, commonly called the 2 jet, was introduced in 1955, and. In carters terminology, any consumer product consisting of 2 or more individual pieces was considered an assembly. This book,how to rebuild and modify rochester quadrajet carburetors, seeks to lift the veil of mystery surrounding the qjet and show owners how to tune and modify their carbs for maximum performance. Rochester 2g, 2gc 2 jet carburetor rebuild part 1 youtube. The 2 ahead of the g means the carburetor has 2 bores, 2 venturii and 2 separate but identical metering systems, one for each carburetor bore. Nov 19, 2009 rochester 2 jet identification q discussion in the hokey ass message board started by scott, nov 19, 2009. This book, seeks to lift the veil of mystery surrounding the q jet and show owners how to tune and modify their carbs for maximum performance. Jun 15, 2006 the q jet is a very capable but often misunderstood carb. The twostage carburetor, built almost entirely of aluminum, first came out on gm frontwheeldrive vehicles.
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