The Weber carburettors are the most widespread carburettor design on the Alfa Romeo 105 and shape the running, the response and the tuning of the engine. As a manufacturer, supplier and spare parts specialist for classic Alfa Romeo parts, we carry Weber carburettors, Weber air jets, Weber main jets, gasket sets, carburettor individual parts as well as the associated fuel supply for the models of the 105 series, that is Spider, GT Bertone and Giulia. As the jet configuration and the flange dimension are decisive for the clean running on the Weber carburettors, the correct assignment to the carburettor type, the jet size and the flange dimension is especially important. Ordering by the model name alone easily leads to unsuitable parts and avoidable returns, whereas the precise stating of carburettor type, jet size, flange dimension and year allows a reliable selection. The following overview shows how the product groups around the Weber carburettor relate to the carburettor type and the tuning and what to watch for in the selection. As the Weber carburettor is important for a clean engine running, a good response and an even idle, a matching and complete selection of carburettor, jets, gaskets and individual parts has a particular importance. Especially on a twin carburettor setup with two Weber carburettors both carburettors should be of the same type and cleanly matched to one another.
Model and series reference
On the models of the 105 series the Weber area depends on the specific Weber carburettor type, the jet configuration and the flange dimension. Depending on the model, year and tuning, different Weber carburettors with different jets were fitted, so that the jet size and the flange dimension must match exactly. Anyone who knows the Weber carburettor type, the jet size, the flange dimension and the year of their vehicle can compile Weber carburettors, air jets, main jets, gasket sets, carburettor individual parts as well as the associated fuel supply specifically, reliably and without wrong orders. The carburettor type, the jet size, the flange dimension and the year are decisive in the selection of the Weber parts, not the model name alone. Anyone who knows these points on their vehicle exactly can assign the matching parts reliably and extend the Weber area step by step. As carburettor, flange, jets, gasket and individual parts are matched to one another in design and tuning, coherent parts should be regarded and selected together so that the Weber carburettor works cleanly in the end and the engine runs evenly.
Shared across the range or model dependent
The Weber area follows above all the specific Weber carburettor type and the jet configuration and less the body, so that many parts on Spider, GT Bertone and Giulia can match when the same Weber carburettor type is fitted. Decisive is therefore not the model alone, but the specific Weber carburettor, its flange dimension and the fitted jets. It would be wrong to assume that all Weber parts are the same across all years and models, since depending on the carburettor type and tuning different air jets, main jets and individual parts were fitted. Common across several models are many parts when the same Weber carburettor type is fitted, but jets, gaskets and individual parts follow the specific carburettor and its tuning. Anyone wishing to use parts from another stock should therefore check carefully whether they suit the fitted Weber carburettor type and the flange dimension, since air jets, main jets, gaskets and flanges in particular deviate depending on the type and the tuning. So many parts match across several models with the same Weber carburettor type, but the type-dependent and tuning-dependent parts must fit exactly.
Part types and product groups
The range around the Weber carburettor is divided into several groups. These include the Weber carburettors themselves, the carburettor flanges in the dimensions 40 millimetres and 45 millimetres, the gasket sets and the carburettor individual parts. At the centre are the Weber air jets and the Weber main jets, which are chosen depending on the tuning and the desired running and have a noticeable influence on the running behaviour and the response. In addition the fuel supply with fuel pump and fuel lines belongs to it, also in an electric version, as well as the synchrometer for the clean matching of several Weber carburettors of a twin setup. Added to this are gaskets, flange gaskets and small parts, which are easily overlooked during a repair but are important for a tight and clean running and help avoid false air. These groups cover the Weber area from the carburettor via flanges, gasket sets, air jets and main jets through to the fuel supply with pump and lines and can be selected by carburettor type, jet size, flange dimension and year, so that a step-by-step repair remains easy to plan and individual parts can be replaced one after another.
Differences by year, series or version
The most important difference lies in the Weber carburettor type, the jet configuration and the flange dimension, as the Weber carburettors differ in design, air jets, main jets and individual parts and the flanges are available in the dimensions 40 millimetres and 45 millimetres. The air jets and main jets also follow the respective tuning and the desired running. Anyone ordering parts should therefore state carburettor type, jet size, flange dimension and year precisely so that carburettor, flange, jets and gasket match. Even with apparently similar parts a close look is worthwhile, because small differences in flange dimension, jet size and gasket decide whether a part fits without adaptation and the Weber carburettor works cleanly in the end. Anyone repairing or retuning the Weber carburettor should therefore choose the parts matching the carburettor type and the flange dimension rather than mixing parts of different types, as otherwise the carburettor does not run cleanly and the engine can become uneven.
Notes on selection
For a reliable selection it is advisable to determine the fitted Weber carburettor type, the jet size and the flange dimension before ordering and to decide which part is needed. A photo of the existing Weber carburettor and its type marking helps with assigning the correct type and flange dimension and avoids queries when ordering. The matching gaskets and flange gaskets should be ordered at the same time when changing a part, as they ensure a tight and clean running and avoid false air. For the matching of several Weber carburettors of a twin setup a synchrometer helps to set the carburettors cleanly and evenly to one another and to achieve an even running. With mixed stock from several sources a comparison with the matching Weber carburettor type is worthwhile so that flange dimension, jets and gasket match exactly and later rework is avoided. Anyone fully repairing the Weber area should plan carburettor, flanges, gasket sets, air jets, main jets and the fuel supply together from the start and select them to match the carburettor type and the respective flange dimension. As a manufacturer and spare parts specialist we advise on the correct assignment and supply both original parts and high-quality reproductions in good quality, so that even older Weber carburettors can be fully restored. In case of uncertainty about the carburettor type, the jet size, the flange dimension or the needed part a short consultation before ordering is advisable, so that the right parts are chosen from the start.
Frequently asked questions
Why are the jets so important on the Weber carburettor?
Air jets and main jets substantially determine the tuning and have a noticeable influence on running, response and idle of the engine.
Which flange dimensions are there?
The carburettor flanges are available in the dimensions 40 millimetres and 45 millimetres, the choice depends on the specific Weber carburettor type and the version.
Are Weber parts interchangeable between the models?
Many parts match when the same Weber carburettor type is fitted, but jets, gaskets and individual parts always follow the specific carburettor, its tuning and its flange dimension.
Do I need a synchrometer?
On several Weber carburettors of a twin setup a synchrometer helps to set the carburettors cleanly and evenly to one another.
What details do I need for a reliable order?
Weber carburettor type, jet size, flange dimension and year as well as the precisely desired part, if needed supported by a photo of the carburettor and its type marking.
Do you offer jets and gasket sets?
Yes. We carry Weber air jets and main jets in various sizes, gasket sets as well as further carburettor individual parts and the complete matching fuel supply.
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