The carburettor is a central component of the mixture preparation on the Alfa Romeo 105 and, together with the fuel supply, provides a clean running, a good response and an even idle of the engine. As a manufacturer, supplier and spare parts specialist for classic Alfa Romeo parts, we carry carburettors, carburettor flanges, carburettor individual parts, gasket sets, jets as well as the associated fuel supply for the models of the 105 series, that is Spider, GT Bertone and Giulia. As different carburettor types, flange dimensions and jets were fitted over the production period, the correct assignment to the carburettor type, the flange dimension and the version is decisive. Ordering by the model name alone easily leads to unsuitable parts and avoidable returns, whereas the precise stating of carburettor type, flange dimension and year allows a reliable selection. The following overview shows how the product groups around the carburettor relate to the carburettor type and the flange dimension and what to watch for in the selection. As the carburettor is important for a clean engine running and an even response, a matching and complete selection of carburettor, gaskets and individual parts has a particular importance. Especially on a twin carburettor setup 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, that is Spider, GT Bertone and Giulia, the carburettor area depends on the fitted carburettor type and the version. Depending on the model and year, carburettors from the manufacturers Weber, Dell Orto and Solex were fitted, which differ in design, flange dimension, jets and individual parts. Anyone who knows the carburettor type, the flange dimension and the year of their vehicle can compile carburettors, carburettor flanges, gasket sets, carburettor individual parts, jets as well as the associated fuel supply specifically, reliably and without wrong orders. The carburettor type, the flange dimension and the year are decisive in the selection of the carburettor parts, not the model name alone. Anyone who knows these points on their vehicle exactly can assign the matching parts reliably and extend the carburettor area step by step. As carburettor, flange, gasket, jets and individual parts are matched to one another in design and tuning, coherent parts should be regarded and selected together so that the carburettor works cleanly in the end and the engine runs evenly. On a twin carburettor setup both carburettors should be of the same type.
Shared across the range or model dependent
The carburettor area follows above all the fitted carburettor type and less the body, so that many parts on Spider, GT Bertone and Giulia can match when the same carburettor type is fitted. Decisive is therefore not the model alone, but the specific carburettor, its flange dimension and the fitted jets. It would be wrong to assume that all carburettor parts are the same across all years and models, since depending on the carburettor type and year different jets, gaskets and individual parts were fitted. Common across several models are many parts when the same 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 carburettor type and the flange dimension, since jets, gaskets and flanges in particular deviate depending on the type and the year. So many parts match across several models with the same carburettor type, but the type-dependent parts must fit exactly.
Part types and product groups
The range around the carburettor is divided into several groups. These include the carburettors themselves, the carburettor flanges in the dimensions 40 millimetres and 45 millimetres, the gasket sets, the jets and the further carburettor individual parts. On the Weber carburettors the Weber air jets and the Weber main jets are added, which are chosen depending on the tuning and the desired running and have a noticeable influence on the running behaviour. 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 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 carburettor area from the carburettor via flanges, gasket sets and jets through to the fuel supply with pump and lines and can be selected by carburettor type, 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 carburettor type and the flange dimension, as Weber, Dell Orto and Solex differ in design, jets and individual parts and the flanges are available in the dimensions 40 millimetres and 45 millimetres. The jets and gasket sets also follow the respective carburettor type and the tuning. Anyone ordering parts should therefore state carburettor type, 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 carburettor works cleanly in the end. Anyone repairing the 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 carburettor type, the flange dimension and the fitted jets before ordering and to decide which part is needed. A photo of the existing 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 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 carburettor type is worthwhile so that flange dimension, jets and gasket match exactly and later rework is avoided. Anyone fully repairing the carburettor area should plan carburettor, flanges, gasket sets, 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 carburettors can be fully restored. In case of uncertainty about the carburettor type, the flange dimension or the needed part a short consultation before ordering is advisable, so that the right parts are chosen from the start and unnecessary multiple orders are avoided.
Frequently asked questions
Which carburettor types were fitted on the 105?
Depending on the model and year, carburettors from the manufacturers Weber, Dell Orto and Solex, which differ in design, jets and individual parts.
Which flange dimensions are there?
The carburettor flanges are available in the dimensions 40 millimetres and 45 millimetres, the choice depends on the carburettor type and the version.
Are carburettor parts interchangeable between the models?
Many parts match when the same carburettor type is fitted, but jets, gaskets and individual parts always follow the specific carburettor and its flange dimension.
Do I need a synchrometer?
On several carburettors of a twin setup a synchrometer helps to match the carburettors cleanly and evenly to one another.
What details do I need for a reliable order?
Carburettor type, 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 gasket sets and jets?
Yes. We carry gasket sets, Weber air jets and main jets as well as further carburettor individual parts and the complete associated fuel supply.
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