Carburation
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A light vehicle under normal conditions needs an air-fuel ratio, by mass, of about 15 to 1. By volume, that’s 11000 to 1.
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Carburetor operation overview
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A carburetor operates by using the depression in the intake manifold and atmospheric pressure to mix the fuel with the air passing through a venturi.
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Carburetor systems
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Low speed and idling ports allow the engine to operate with a low throttle opening before the main system is operating fully.
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Metering jets
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The main jet size is selected to provide the best mixture for fuel economy. An extra jet supplies additional fuel for maximum power.
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Accelerating
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For acceleration, suddenly depressing the accelerator delivers extra fuel into the airstream.
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Carburetor barrels
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A 2-stage carburetor has a primary throttle open only from idle to medium speeds. At higher speeds, the secondary throttle opens to admit more air-fuel mixture.
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