carburetor evolution

How do carburetors work?


  1. A carburetor mixes fuel with air and meters the mixture.
  2. Atmospheric pressure forces air through the carburetor into the lower pressure area of the combustion chamber.
  3. A venturi increases the velocity of air passing through a carburetor and creates a low pressure area.
  4. The fuel-air mixture must be vaporized before introduction into the combustion chamber.
  5. The carburetor systems are: Float System, Idle or Low Speed System, Main Metering System, Power System, Accelerating System, and Choke System.
  6. The Float System controls the level and supply of fuel.
  7. The Idle or Low Speed System furnishes the proper mixture for the engine idle, light load and slow speeds.
  8. The Main Metering System controls the fuel mixture from the transfer range to full throttle.
  9. The Power System provides a richer mixture for maximum power and high speed operation.
  10. The Accelerating System controls a small amount of fuel discharged into the air stream for sudden acceleration.
  11. The Choke System delivers additional fuel to the manifold for cold engine starting.

This article was adapted from an AEA Technical Training Manual article published in 1955.

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