The auxiliary nozzle of the SI carburetor does not have the simple function of a conventional nozzle, ie the pure regulation of the amount of fuel. With the introduction of the PX in 1977, the previously used SI carburettor type and its auxiliary nozzles were modified. The old carburetor types, such as those still used in the rally engines, had a separate air duct for the auxiliary nozzles. [...]

de German
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