![]() (The “CD”in the Z-S series designation stands for “constant depression) Constant depression, also known as “constant vacuum”, “constant pressure”, “variable venturi”, or “variable choke”, simply means that the effective area of the carburetor venturi varies according to the engine requirements, producing constant air velocity and pressure differential across the jet orifice during normal running. ![]() Zenith-Stromberg carbs operate on the constant depression principle. While later Z-S models used a large number and variety of “add on” features to meet our pollution control requirements, the basic “heart” of these carburetors remained relatively simple. for example, is actually simpler and more reliable than the SU carburetor it replaced. The basic Zenith-Stromberg, as used on Triumphs in the mid-’60s. Fear of the unknown is probably the greatest stumbling block most people seem to have in dealing with Zenith-Stromberg carburetors – they are much maligned largely because they are not understood.
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