Motor Stuffed, use a Vacuum Gauge to check
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Thread: Motor Stuffed, use a Vacuum Gauge to check

  1. #1
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    Default Motor Stuffed, use a Vacuum Gauge to check

    Found this great vacuum gauge engine problem diagnosis chart

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    vac1.jpg

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    That diagram must be over 50 years old. I have a copy and the gauge is now languishing with exhaust probes, carbie manometers, and overhead valve tools. It takes me back to the good old days of tuning engines.
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    Quote Originally Posted by seasink View Post
    That diagram must be over 50 years old. I have a copy and the gauge is now languishing with exhaust probes, carbie manometers, and overhead valve tools. It takes me back to the good old days of tuning engines.
    So true, I have the same equipment, meters and charts among many others, some nostalgia there and most of the answers before electronic On board diagnostics, that might not diagnose a fault anyway!.

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    Wow, that takes me back. When I was about 18 I fitted a vacuum gauge to the 4CV. It mostly sat on little or no vacuum, as the accelerator was on or near the floor most of the time. Didn't Holden fit them as economy gauges on those dismal Toranas with the Starfluff motor?
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    JohnW

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    COL
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    Quote Originally Posted by JohnW View Post
    Wow, that takes me back. When I was about 18 I fitted a vacuum gauge to the 4CV. It mostly sat on little or no vacuum, as the accelerator was on or near the floor most of the time. Didn't Holden fit them as economy gauges on those dismal Toranas with the Starfluff motor?
    Yer the first Holden Commodores had them as standard in the base models.

    The vacuum gauge can be used to drive for economy by driving for the highest vacuum and changing down gears when the vacuum gets low, thus raising the revs and closing the butterfly a little.
    Regards Col

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    Quote Originally Posted by COL View Post
    Yer the first Holden Commodores had them as standard in the base models. The vacuum gauge can be used to drive for economy by driving for the highest vacuum and changing down gears when the vacuum gets low, thus raising the revs and closing the butterfly a little.
    Indeed! I'd forgotten the Commodes had it. Ha, "base models" is a great term.

    It certainly didn't work with the 750, as you couldn't get "the highest vacuum" in my experience, except downhill!

    We've come quite a long way when you think about it.
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    JohnW

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    G'day,

    Quote Originally Posted by COL View Post
    ........The vacuum gauge can be used to drive for economy by driving for the highest vacuum and changing down gears when the vacuum gets low, thus raising the revs and closing the butterfly a little.
    yeah, that's what we were taught in days of yore....

    Fast forward to the modern era and the on board 'puter tells me that the fuel consumption rises every time that the box is shifted down, due to the higher RPM one assumes. Same effect in the manual BA ute and the auto Latitude, up hill or cruising, shift to a higher gear and the economy improves.....

    cheers,
    Bob

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    COL
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    Quote Originally Posted by bob View Post
    G'day,



    yeah, that's what we were taught in days of yore....

    Fast forward to the modern era and the on board 'puter tells me that the fuel consumption rises every time that the box is shifted down, due to the higher RPM one assumes. Same effect in the manual BA ute and the auto Latitude, up hill or cruising, shift to a higher gear and the economy improves.....

    cheers,
    Bob
    Perhaps I should clarify that statement that I made above, as you are driving up hill you will find that you will need to open the butterfly to maintain speed, it will get to a point where it is more fuel efficient to change down a gear and run at slightly higher revs.

    I noticed that my Laguna does this to keep the engine running at its most efficient. The car has the power to use a higher gear because i can over ride it and still accelerate in the higher gear.
    Regards Col

    1973 Renault R12 Station Wagon
    1976 Renault R12 Station Wagon
    2002 Renault Laguna V6
    1973 Alpine A110

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