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A carburetor (also spelled carburettor or carburetter) [1] [2] [3] is a device used by a gasoline internal combustion engine to control and mix air and fuel entering the engine. [4] Carburetors can be quite complex but the primary method of adding fuel to the intake air in the main metering circuit is through the pressure difference using the ...
The engine can be mounted vertically as well as horizontally. [16] PD style carburetors are for inline and radial engines from 900 to 1900 cubic inches. [16] PT style carburetors are usually found on 1700 to 2600 cubic inch engines [16] PR style carburetors are used on 2600 to 4360 cubic inch engines [16]
For small engines, even only one half of the carburetor was used, with the other half blinded and partially cut off. The basic carburetor size can be selected by the butterfly valves, for DCO/DCOE the sizes are 38/40/42/45/48/50/55, with 40/45/48/50/55 being more common and available today. Jet size is based on choke size, and choke size is ...
By comparison, a "square bore" carburetor has primary and secondary venturis of similar size. Most Quadrajets were capable of 750 cu ft (21,000 L)/min ( cfm ) maximum, but some rare Buick and Pontiac models [ 1 ] were capable of 800 cu ft (23,000 L)/min for use on high performance engines, and most 1984-1987 pickup trucks were also equipped ...
These engines were used by IHC for some heavy-duty applications until 1935, although their own large engines (525 cu in (8.6 L) FBD and 648 cu in (10.6 L) FEB) had appeared in 1932. [6] The medium-duty 1930 A-series trucks received the all-new 278.7 cu in (4.6 L) FB-3 six-cylinder engine, with overhead valves and seven main bearings.
Although carburetor technology in automobiles reached a very high degree of sophistication and precision, from the mid-1980s it lost out on cost and flexibility to fuel injection. Simple forms of carburetor remain in widespread use in small engines such as lawn mowers and more sophisticated forms are still used in small motorcycles.