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Today

Carburetor. Today. What is a Carburetor ?. Armature. Magneto. What does the Carburetor Do?. Creates the AFM and controls how much AFM enters the engine. How does the Carb Create the Air – Fuel Mixture?. Venturi Effect. What is a Venturi ?.

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Today

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  1. Carburetor Today

  2. What isa Carburetor?

  3. Armature Magneto

  4. What does the Carburetor Do? Creates the AFM and controls how much AFM enters the engine

  5. How does the Carb Create the Air – Fuel Mixture?

  6. Venturi Effect

  7. What is a Venturi?

  8. As Air Passes through a restricted opening it speeds up

  9. If opening is placed just past the narrowing, a vacuum is created

  10. Connecting this concept to a Carburetor

  11. How does it Work?

  12. The Basics

  13. During the INTAKE strokeAir is pulled into the Carb through the Air Filter

  14. The Air passes though the Venturi in the Carb

  15. The air speeds up and creates a vacuum and fuel enters the air stream though small holes at the narrowest part of the venturi

  16. The amount of fuel brought into the air stream is regulated depending on:

  17. Start upIdleHigh Speed

  18. At Start upWhen the engine is coldfuel vaporizes less readily

  19. At Start upFuel tends to condense on the cylinder walls of the INTAKEmanifold

  20. At Start upThe result = a fuel staved cylinder

  21. At Start upThus the engine becomes harder to start

  22. At Start upWhen the engine is coldfuel vaporizes less readily

  23. At Start upTo combat this, more fuel is required in the mix

  24. At Start upTo make the AFM richer (more fuel than air)the CHOKE is opened

  25. At Start upBy opening the CHOKE, air becomes starved and more fuel is allowed to enter the mix

  26. At Idle

  27. At IdleAs the engine heats up, the choke gets shut off and regular flow resumes

  28. At IdleIf the engine runs rough, you can adjust that amount of fuel flow with the Idle Set Screw

  29. At IdleThis screw opens or closes the gap that fuel flows into the air stream through

  30. Lab Time

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