Fuel injectors

KChurch86 Mar 6, 2015

  1. KChurch86

    KChurch86 Titan Swapped / SAS'd Founding Member

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    Sidenote: This is really just a general tech. question but I had to pick a sub-forum to put it in, and figured fabrication was the closest category. Anyway...

    I'm looking for somebody to take me to school on fuel injectors. I've got a project in mind that would use a single fuel injector (not necessarily an Xterra one) but the injector wouldn't be hooked up to a computer or any kind of electrical controller. Essentially I'm looking to use it solely as a spray nozzle.

    If I were to connect a fuel injector to a pump and flow liquid through it, without the presence of a computer to tell the injector when to spray, would it spray the entire time the pump is flowing?

    Is there some sort of valve in them that "opens" and "closes" them? If not, then what are the electrical connectors on fuel injectors there for?

    Would a fuel injector function as a spray nozzle if connected to a pump and nothing more?


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    Last edited: Mar 6, 2015
  2. KChurch86

    KChurch86 Titan Swapped / SAS'd Founding Member

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    I got my answer, this can be deleted please and thank you.

    EDIT: I just realized it's sort of silly to delete this when the potential exists for somebody else to have this same question down the road. So I guess if anything this thread could be moved to someplace more suitable.

    So, to answer my question, YES, there is a small valve inside of a fuel injector. The valve is normally closed and held that way by a small spring. When the ECU sends a signal to the injector, a small electromagnet opens the valve and lets the fuel (which is being pushed by the fuel pump) through the nozzle.

    Of course the ECU uses the engine timing, intake air flow, throttle position, probably intake air temperature, engine temperature, etc. etc. to know when to send the signal to the injectors. But essentially, an injector is a spring-loaded valve with an electromagnet actuator and a precise atomization nozzle. Pretty cool stuff, I think.

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    Last edited: Mar 13, 2015
  3. KChurch86

    KChurch86 Titan Swapped / SAS'd Founding Member

    Messages:
    14,633
    Location:
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    From the interwebs:

    [​IMG]

    This photo is probably the best representation as most of the others I found were way too busy or crowded, and some were mislabeled. This one does omit the electrical connector, but basically the wires within the connector attach to the coil to form the electromagnet.
     

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