Questions and Answers
What are the systems in a float type carburetor?
Float chamber, main metering system, idling system, mixture control system, accelerating system, economizer system.
What components does the main metering system consist of?
Venturi, main metering jet, main discharge nozzle, passage leading to the idling system, throttle valve.
What is the function of the economizer system?
A valve that is closed at throttle settings below approximately 60-70% of rated power, must be richer than cruise.
What types does the mixture control system include?
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What happens in the idling system when the throttle valve is closed?
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Study Notes
Float Type Carburetors Overview
- Consist of multiple systems serving different functions.
- Essential for regulating air-fuel mixture and engine performance.
Key Systems in Float Type Carburetors
- Float Chamber: Maintains fuel supply level for carburetor operation.
- Main Metering System: Controls the fuel-air ratio during main engine operation.
- Idling System: Functions at low speeds when throttle is closed.
- Mixture Control System: Adjusts the fuel mixture for efficiency.
- Accelerating System: Facilitates quick fuel delivery on acceleration.
- Economizer System: Enhances fuel efficiency at various throttle settings.
Main Metering System Components
- Venturi: Creates a vacuum to draw fuel into the airflow.
- Main Metering Jet: Regulates fuel flow in accordance with engine demands.
- Main Discharge Nozzle: Disperses fuel into the airstream.
- Idling System Passage: Connects main metering to idling system.
- Throttle Valve: Controls airflow into the engine, affecting power output.
Economizer System Functionality
- Operates as a valve, maintaining a richer mixture below 60-70% throttle settings.
- Primarily focused on improving fuel richness during cruising.
Mixture Control System Types
- Needle Type: Adjusts fuel flow based on engine requirements.
- Back Suction Type: Uses engine vacuum to influence fuel mixture.
Idling System Characteristics
- Throttle valve remains closed at idling speeds; critical for maintaining engine stability.
- Low air velocity in the venturi restricts fuel flow, requiring alternative fuel management strategies.
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Description
Test your knowledge on the systems and components of float type carburetors with these flashcards. Each card covers essential terms and definitions, making it a great study tool for automotive enthusiasts. Enhance your understanding of carburetor mechanics and systems.
