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Carburetor Systems

Carburetor Systems. Fuel inlet system Stores fuel for immediate use Maintains level. Viton Needle, brass seat Dampening spring Vapors vented to carbon canister. The Float Bowl. Idle Circuit. Low airflow @ idle, main system will not operate

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Carburetor Systems

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  1. Carburetor Systems

  2. Fuel inlet system Stores fuel for immediate use Maintains level Viton Needle, brass seat Dampening spring Vapors vented to carbon canister The Float Bowl

  3. Idle Circuit • Low airflow @ idle, main system will not operate • High vacuum under throttle plate draws fuel out idle ports • Sometimes adjustable • Idle air bleed helps atomize fuel

  4. Transfer Circuit • Adds fuel as throttle plate opens, overcomes “lag”

  5. Main Metering Circuit • Fuel supplied by “main jets” • High venturi vacuum creates low pressure at nozzle tip • Atmospheric pressure in float bowl pushes fuel out discharge nozzle

  6. Power Circuit • Provides extra fuel at WOT • Mechanical power valve, maybe adjustable • Sometimes combination with metering rods • Flows through a circuit into main metering system

  7. Accelerator Pump • During sudden acceleration, mixture leans out • Pumps a lot of fuel into venturi

  8. Choke Circuit • Very rich A/F needed on cold starts • Closes off top of venturi to raise the vacuum level allowing greater fuel flow into manifold • Opens as engine warms up, or as an electric coil heats up

  9. Choke Coil Operation

  10. Choke Pulloff • Forces the choke open slightly just after engine starts. • Position determined by • torque of coil • air velocity on blade • vacuum on piston • must adjust correctly!

  11. Altitude Compensator • Compensates for altitude • Adjusts an air bleed

  12. Idle Speed Control

  13. Throttle Kicker • Electric motor or solenoid, increases idle 1. Dashpot, 2. Throttle kicker, 3. Throttle cable, 4. Idle adjustment

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