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Weber Carbs 101 By Inglese™

Discussion in 'Inglese Technical Reference Articles' started by jjamros, Aug 5, 2010.

  1. jjamros

    jjamros Guest

    Weber carburetors have set the performance standard on the industry’s finest carbureted racing and street machines. One of the primary reasons Weber carburetors have reached such a high status is their incredibly adaptable, modular design. Webers allow a wide variety of styles and configurations that enable the user to select the precise design and size for the intended use. Two Weber carburetors that look identical from the outside can have differing internal setups that make one an economic choice for cruising and the other a performance option for serious race applications.
    Before Inglese™ Begins Work

    The incredible versatility that has made Weber carburetors so famous has also made them infamous. Webers have developed a certain mystique and a reputation for being too hard to tune for the average car owner. Nothing could be further from the truth.

    In many regards, Webers are no different than the mass produced OEM carburetors that many of us are already familiar with. The purpose of both is to blend air and fuel into an ideal mixture for your engine. The problem with stock carburetors is they are only designed to function with stock engines. If an engine is modified, a new carburetor is often needed. Weber carburetors can be fine tuned as changes are made to an engine in order to maintain optimum fuel/air ratios. In this regard, Weber carburetors are more complex. But at the same time, their complex nature allows them to be easily (yes, easily) adapted to whatever performance application you have.
    Inglese™ Induction System With Four IDA Weber Carburetors.
    Because of their complex nature, you cannot simply pull a Weber off the shelf and expect it to work. It must be jetted and tuned to work with your specific application. The experienced professionals at Inglese™ do this delicate work for you, properly calibrating and setting up each Weber Carbureted Induction System to deliver the exact performance your application requires, almost right out of the box. At Inglese™ every new Weber carburetor is dissembled, properly jetted, reset and cleaned.

    With Inglese™, your vehicle will have the excellent throttle response, quick acceleration and overall flexibility that Weber carburetors are known for, with minimum tuning after installation. However, before installing any Weber carburetor, be prepared. Inglese™ recommends using spark plugs at one hotter range and setting initial timing to no more than 12 to 14 degrees. Having new spark plugs and properly calibrated timing ready ahead of time will help when it’s time to install your new induction system.

    Weber carburetors from Inglese™ come nearly ready to run right out of the box. Simply bolt on the intake manifold, hook up the throttle linkage and attach the fuel line. That’s usually all it takes for your Weber carburetor from Inglese™ to be set up and ready to drive. Let’s take a closer look at these simple steps.

    Hooking up the throttle linkage on a Weber is a two-man job. While you are attaching the linkage, another person should press down on the gas peddle to check peddle clearance. If full throttle pulls on the linkage, it can damage your setup. Installing a return spring at this point will help maintain a consistent idle and increase safety.

    The next step is to attach the fuel line to the regulator. Do not run Teflon tape to the end of the thread; stop about three threads from the end to keep deteriorating Teflon pieces from getting into the system. Set the fuel pressure regulator to about 3 psi (Weber carburetors are not designed to handle fuel pressures much higher than 4 psi). Then, simply turn the electric fuel pump on, or crank the engine with the coil wire removed.

    With the isolated runner design of Weber carburetors, every stack has a separate mixture screw. On a four, two-barrel setup there will be four idle screws on each side of the induction system. That’s all it takes to install an Inglese™ Induction System. Your Weber carburetor is now ready to drive. If you want to fine tune your carburetor at this point, Inglese™ recommends you first drive your car three or four miles to bring the engine up to operating temperature.

    Having to adjust four carburetors may sound intimidating, but truthfully, it's no harder than a single four barrel. The only difference is you adjust each cylinder separately. In a typical four, two-barrel Weber setup, each cylinder is fed by a single barrel with no communication between barrels or cylinders. This “isolated runner” design ensures that each cylinder is fed exactly the same as the next, with no possibility of charge-robbing or over-feeding. A Weber carburetion system will not perform or sound right until it's synchronized to ensure that each carburetor is performing exactly as the next. The synchronization procedure can either be a breeze or a nightmare, depending on how well-designed your linkage system is – your linkage must allow independent adjustment of each carburetor. All linkage systems used by Inglese™ allow this.

    Inglese™ flow tests every carburetor to ensure synchronization before shipment. However, if your Weber carburetor needs to be adjusted, the idle mixture adjustment on each barrel is a simple procedure that can be easily done with a synchrometer carburetor synchronizing tool. Simply place the tool over each stack, one at a time. Adjust the idle and mixture screws until the synchrometer reads the same for each. Slight variations may be found between the “inside” and “outside” stacks. It is impossible to mess up the process so long as you remember to always start from scratch at 3/4 of a turn out. From that point, you screw 1/8 of a turn either direction (usually in).
    Use a carburetor synchronizing tool to measure airflow through each stack. Then adjust your Weber’s idle screws until all stacks are equal. Once your Weber carburetor has been synchronized, you can adjust the idle speed by turning a single screw in or out. The location of the master screw varies according to system type. However, on all V8 and V6 systems there are only two carburetor mounted speed adjusting screws – one on each side. Once your Weber is synchronized and the idle mixtures are dialed, it's set! You can put your tools away for the rest of the year.

    Weber carburetors offer incredible performance and unmatched versatility. With an Inglese™ Induction System, the most challenging parts of setting up a Weber are done by a knowledgeable technician. So when you receive your new Weber, it is fully calibrated for your exact application and ready to run. If you do have trouble, Inglese™ offers free tech support to all Weber carburetor owners. With Inglese™ behind you, there’s no reason not to own the world's most beautiful, exotic and powerful carburetor.

    The industry’s foremost induction jeweler for almost thirty years, Inglese™ specializes in show quality custom tuned Weber carburetion systems.

    For more information about Inglese™ Weber carburetion systems, call Inglese™ at 1-866- 450-8089, or visit www.inglese.com.

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    Last edited by a moderator: May 29, 2014

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