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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]
Many differential screw configurations are possible. The micrometer adjuster pictured uses a nut sleeve with different inner and outer thread pitches to connect a screw on the adjusting rod end with threads inside the main barrel; as the thimble rotates the nut sleeve, the rod and barrel move relative to each other based on the differential between the threads.
The carburetor supplies a mixture of fuel and air into the engine, with the proportions kept fairly constant and their total volume throttled to control the engine power. Apart from sharing the diesel's use of compression ignition, their construction has more in common with a small two-stroke motorcycle or lawnmower engine.
The Fish carburetor metered its fuel flow through a calibrated tapered groove, connected directly to the accelerator pedal and the throttle butterfly. [1] The fuel metering orifice was controlled in immediate proportion to the throttle position, in a similar manner to the motorcycle slide carburetor .
This led to fitment problems on twin carb installation. Amal introduced a "chopped" version of the 376 and 389 without the float chamber so twin carburettors could be fitted. Both carbs were fed from the float chamber of the left hand carb. [16] Triumph twins used two chopped monoblocs and a remote float chamber mounted centrally behind the carbs.
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This allows the engine's idle speed to be maintained constant. The linear servo is most commonly a combination of a DC motor, lead screw and a digital optical encoder. There is essentially no difference in efficiency between the technique of bypassing the throttle butterfly and operating the butterfly itself.
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