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Thread: EGT probe protrusion

  1. #1
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    EGT probe protrusion

    How far in do you stick the probe in the exhaust stream?
    With my Auber in the 120 build I only have it in the stream about 13mm.
    With the VDO I bought for the FC I am working on , the instructions are a bit vague but it looks as if it goes nearly right across to the other side.
    I am a bit wary of that as it looks a bit fragile.
    Found this which made me think my first is not in far enough but I can still get 700 C on it.
    The Sensor Connection EGT Probes Motorsports Sensors and Gauges content/not-inserting-egt-probe-tip-completely-center-exhaust-stream-can-result-low-egt-temperature-
    Does this mean my EGT is really higher and I should put it in further?
    What have others done? This is pre-turbo.

    Keith

  2. #2
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    Tip in the center.

  3. #3
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    Won't really matter how deep Keith, as long as it is in the pipe.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)

  4. #4
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    depending on the probe (and its conductivity to the exhaust manifold) you only need to go about 1/8-1/4 of the way into the stream.

    if you get too close to the pipe it will pick up some residual heat from the metal work, its easy to spot when this happens you'll get a normal initial rise a quickish drop but then it will hold for a little while before dropping down slowly.

    IF you're too far towards the outside you'll get a slow rise as the probe bleeds heat to the pipework.

    its not super critical.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

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    TDI D1(its getting sold)
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    Archaeopteryx 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
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  5. #5
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    Quote Originally Posted by Blknight.aus View Post
    depending on the probe (and its conductivity to the exhaust manifold) you only need to go about 1/8-1/4 of the way into the stream.

    if you get too close to the pipe it will pick up some residual heat from the metal work, its easy to spot when this happens you'll get a normal initial rise a quickish drop but then it will hold for a little while before dropping down slowly.

    IF you're too far towards the outside you'll get a slow rise as the probe bleeds heat to the pipework.

    its not super critical.
    Hope this ain't a hijack... But rather general advice question,
    how far would a probe need to go in on a 300 tdi through the egr blank?
    From memory it's some way to get in to the gas flow.

  6. #6
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    Quote Originally Posted by Bearman View Post
    Won't really matter how deep Keith, as long as it is in the pipe.
    Thats what I thought but that article I linked started to make me think otherwise.

  7. #7
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    Quote Originally Posted by 123rover50 View Post
    Thats what I thought but that article I linked started to make me think otherwise.
    I have real doubts that would be true. I can believe there might be a few degrees difference between the edge and the centre of the airflow but I wouldn't expect much variance under load. I notice they didn't actually say what the temperature reading were after moving the probe deeper.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)

  8. #8
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    Quote Originally Posted by shack View Post
    Hope this ain't a hijack... But rather general advice question,
    how far would a probe need to go in on a 300 tdi through the egr blank?
    From memory it's some way to get in to the gas flow.

    About 2 inches.

    as Im stripping my manifold out later this week I'll measure mine for you.

    flick me a reminder.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    TDI D1(its getting sold)
    Tdi auto d1 (its getting sold)
    Archaeopteryx 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

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