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Carburetion - PowerPoint PPT Presentation


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Carburetion. Fuel Delivery. Purpose: produce mixture of fuel & air to operate an engine. Basics: 1. Air enters top of carburetor 2. Mixes with liquid fuel 3. Goes through passages 4. Sprayed into intake manifold 5. Burned in combustion chamber. Operates based on different pressures

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carburetion

Carburetion

Fuel Delivery

slide3

Basics:

1. Air enters top of carburetor

2. Mixes with liquid fuel

3. Goes through passages

4. Sprayed into intake manifold

5. Burned in combustion chamber

slide4

Operates based on different pressures

  • Cylinder has no atmospheric pressure
  • Air/fuel mixture is pushed into cylinder by atmospheric pressure in the carb
slide5

Venturi principle- Restriction in a passage creates a vacume.

  • ( Causes air to move more rapidly)
slide6

Carbs come in many styles & types

  • Natural draft- air flows horizontally into manifold
  • Updraft- a/f mixtures forced upward toward engine
  • Downdraft- gravity assists air into manifold
slide7

Float type carburetors

  • Float= maintains constant level of fuel in float bowl
  • When fuel is used float unseats needle valve and allows fuel to enter the bowl
slide8

Choke- Round disk mounted on shaft at the intake end of the carb.

  • Closed= provides more fuel to the engine to allow starting
slide9

Adjusting needle- adjusts the amount of fuel entering the nozzle to be discharged.

  • Sometimes these are pre-set & non adjustable
slide10

Primer- hand operated plunger

  • Forces additional fuel through main nozzle.
  • Mainly used to start cold engines
slide11

Governor

    • Maintain a selected speed
    • Prevent over-speeding that could cause engine damage
    • Limit high & slow speeds
slide12

Air Cleaners

  • Engines must have clean air!
  • Dust/moisture ruin engines
slide13

Servicing an Air Cleaner

  • Change ever 25 hours on lawnmowers
  • Follow manufacturers instructions