Are internally driven superchargers located before or after the carburetor?

Are internally driven superchargers located before or after the carburetor?

• A. Before the carburetor.
• B. Inside the carburetor.
• C. After the carburetor.
• D. Not related to carburetor.

Answer: (C)

Internally driven superchargers are placed in the induction path so they compress the air–fuel charge after it has been metered by the carburetor. The carburetor relies on pressure differences to meter fuel accurately, so boosting the air before the carb would interfere with that metering and could cause improper fuel flow, flooding, or lean conditions when boost is added. By locating the compressor after the carburetor, the carb can maintain proper fuel metering at boosted intake pressures, and the compressor then increases the density of the already metered mixture as it moves into the intake manifold and cylinders. If the supercharger were before the carburetor, fuel metering under boost would be unreliable, which is why the preferred arrangement is after the carburetor.

Internally driven superchargers are placed in the induction path so they compress the air–fuel charge after it has been metered by the carburetor. The carburetor relies on pressure differences to meter fuel accurately, so boosting the air before the carb would interfere with that metering and could cause improper fuel flow, flooding, or lean conditions when boost is added. By locating the compressor after the carburetor, the carb can maintain proper fuel metering at boosted intake pressures, and the compressor then increases the density of the already metered mixture as it moves into the intake manifold and cylinders. If the supercharger were before the carburetor, fuel metering under boost would be unreliable, which is why the preferred arrangement is after the carburetor.