How carbs work - a technical analysis
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  1. #1
    Registered User Array Commuter Boy's Avatar
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    May 2003
    Suzuki Bandit

    How carbs work - a technical analysis

    Basics of Carburetor Operation

    The basic secret of carb function is that inside each carb are
    thousands of tiny gnomes; each with a small bucket. As you open the
    throttle, more of these gnomes are allowed out of their house and into
    the float bowl, where they fill the buckets and climb up the carb's
    passages to the intake, where they empty their buckets into the air

    But, if you don't ride the bike for a while, bad things can happen.
    Tiny bats take up residence in the chambers of the carb, and before
    long the passages are plugged up with guano. This creates a gnome
    traffic jam, and so not enough bucketfuls of fuel can get to the
    engine. If it gets bad enough, the gnomes simply give up and go take
    a nap. The engine won't run at all at this point. Sometimes you'll
    have a single dedicated gnome still on the job, which is why the bike
    will occasionally fire as the gnome tosses his lone bucket load down
    the intake.

    There has been some research into using tiny dwarves in modern carbs.
    The advantage is that unlike gnomes, dwarves are miners and can often
    re-open a clogged passage. Unfortunately, dwarves have a natural fear
    of earthquakes, as any miner should. In recent tests, the engine
    vibrations caused the dwarves to evacuate the Harley Davidson test
    vehicle and make a beeline for the nearest BMW dealership. Sadly,
    BMW's are fuel injected and so the poor dwarves met an unfortunate end
    in the rollers of a Bosch fuel pump.

    Other carb problems can also occur. If the level of fuel in the float
    bowl rises too high, it will wipe out the poorer gnome housing in
    the lower parts of the carb. The more affluent gnomes build their
    homes in the diaphragm chamber, and so are unaffected. This is why
    the bike is said to be "running rich".

    If the fuel bowl level drops, then the gnomes have to walk farther to
    get a bucketful of fuel. This means less fuel gets to the engine.
    Because the gnomes get quite a workout from this additional distance,
    this condition is known as "running lean".

    The use of the device known only as the 'choke' has finally been
    banned by PETG (People for the Ethical Treatment of Gnomes) and
    replaced by a new carb circuit that simply allows more gnomes to carry
    fuel at once when the engine needs to start or warm up. In the
    interests of decorum, I prefer not to explain how the 'choke'
    operated. You would rather not know anyway.

    So, that's how a carburetor works. You may wish to join us here next
    week for basics of electricity, or "How your bike creates cold fusion
    inside the stator, and why the government doesn't want you to know
    about it."

    -shamelessly pinched from Euro-moto

  2. #2
    Registered User Array jonesboy's Avatar
    Join Date
    Mar 2002
    New West
    '09 Bandit SEA
    ..moved to a more appropriate home.


  3. #3
    Registered User Array SpideRider's Avatar
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    Jul 2002
    Fraser Valley
    Cry in the dojo, laugh on the battlefield
    Sparring speed is a matter of simple physics:
    The height of your flight is inversely proportionate to the mass of your ass.

  4. #4
    Moderator Array jeckyll's Avatar
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    Apr 2004
    Kawasaki Land Rover and a liter-twin
    I always wondered

  5. #5
    Go big or go home Array Madkawi's Avatar
    Join Date
    Apr 2002
    YZF R1
    Carburetor:A high tech toilet.

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