Fuel injection

Discussion in 'Motorbike Technical Discussion' started by NewBie, Aug 17, 2004.

  1. NewBie

    NewBie Guest


    What is Fuel Injection? What are the benefits of Fuel Injection compare with
    non Fuel Injection engine?
    NewBie, Aug 17, 2004
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  2. NewBie

    David Kelly Guest

    A carburetor is an analog computer, its very difficult to write complex
    programs for. It feeds fuel at a rate determined by the air velocity and
    throttle position. To feed fuel at different rates, such as when the
    throttle is opening, requires more trouble-prone analog circuits (such
    as an accelerator pump). Or to respond to different temperatures.

    Fuel injection systems were not always digitally controlled. The
    carburetor analog computer has to produce a vacuum over a fuel port in
    order to draw fuel. Early FI was able to open a valve and pump more fuel
    in response to some other kind of feedback indicating more fuel was
    needed. Air velocity over a venturi wasn't needed.

    Modern digital fuel injection can feed fuel limited only by feedback
    sensors and the software programmer's ability. No longer when one needs
    more fuel one must produce more air to draw the fuel out of the float
    bowl. No longer is one limited to the simple pattern as an accelerator
    David Kelly, Aug 17, 2004
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  3. NewBie

    Rob Munach Guest

    That 15% figure sounds waaay high. Where are you getting that number?
    That makes sense for a Diesel as there is no Venturi OR throttle

    Rob Munach, Aug 17, 2004
  4. NewBie

    Rob Munach Guest

    Interesting information. Thanks....

    Rob Munach, Aug 18, 2004
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