Weber Technical Centre
Welcome to the PAFClassic Weber Technical Center, your go-to resource dedicated to Weber carburettors, their operation, adjustment, and tuning.
Explore our technical guides, operating diagrams, and tuning advice to better understand your Weber carburettor, diagnose fuel system issues, and select the components best suited to your engine configuration.
The Complete Guide to Identifying your Weber Carburetors
Whether you're looking for a rebuild kit, jets, venturis, a float or simply an air filter, knowing the exact model of your Weber carburettor will save you from costly ordering mistakes.
Weber DCOE
Fuel Circuits
The Weber DCOE carburettor is made up of several fuel circuits, each designed to operate within a specific engine speed and load range. From idle to full throttle, these circuits work progressively together to provide the correct air-fuel mixture under all driving conditions. Understanding the function of the idle circuit, main circuit, accelerator pump, and cold-start circuit is essential for diagnosing carburation issues, selecting the correct jets, and achieving the best performance from your engine.
Weber DCOE idle circuit: operation, adjustment and tuning advice
The Weber DCOE idle circuit plays a crucial role in supplying the engine at low speeds. Contrary to what its name might suggest, it does not operate only when the engine is idling.
Weber DCOE main circuit: operation and tuning
Does your Weber DCOE or DCO/SP carburetor hesitate during acceleration?Does the engine appear to run with a mixture that is too lean at high rpm?Do you want to understand how jet selection influences performance?
Weber DCOE Accelerator Pump Circuit — How Does It Work?
Have you ever wondered why a carburetor needs an accelerator pump? And, more importantly, how this small mechanism prevents the infamous “flat spot” during acceleration?
The principle is actually quite simple.
Converting a Weber Carburetor for E85 (Super Ethanol)
To run a Weber carburettor on E85 ethanol fuel, it is important to distinguish between two aspects that are often confused: the carburettor's compatibility with the fuel and the tuning required for the engine to operate correctly on E85.
