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Thread: Home made manometer question.

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  1. #1
    It's a way of life! oldnslow's Avatar
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    Home made manometer question.

    Going to make my own manometer out of tubing. Going to work on my 98 R1100RT. The question is, do the lengths of the tubes, that are above the liquid, running to 'carburetors', have to be of exact equal lengths? Or will vacuum not know the difference in the length?
    Mike Davis
    "Old n Slow" It's a way of life!
    1985 K100RT

    1998 R1100RT

  2. #2
    Registered User David13's Avatar
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    I don't know. And I don't need to know. As I have the widely touted Harmonizer. So I just take it out of the box, and hook it up, and balance.
    I know there are quite a few who like to stick with the old ways, so they perhaps can and will answer.
    I do shun some modern devices, sometimes, and go back to the ancient ways, for recreation.
    But maintenance on my bike is serious business to me, and I have fun doing it.
    dc

  3. #3
    Long Range Rifleman NI5L's Avatar
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    Quote Originally Posted by David13 View Post
    I don't know. And I don't need to know. As I have the widely touted Harmonizer. So I just take it out of the box, and hook it up, and balance.
    I know there are quite a few who like to stick with the old ways, so they perhaps can and will answer.
    Why did you even post this self aggrandizing drivel?

    The OP asked about tubing for a homemade manometer, not a braggadocios "I'm cooler than you" post.

    Jeeeeezus!
    Warren
    '97 R1100RT - My daily driver

    Ave atque vale, my America.

  4. #4
    IBA #44567 Ken F's Avatar
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    Mike,

    The one I made, I used about 5' of hose going up, and about 5'going into the loop & 5' back up. In other words 20' of tubing.
    The fluid will seek it's own level in the "loop" of tubing, and equalize. The vacume will pull the fluid to one side or the other, whichever has the most vacume.

    If you would like to call me, I've got one made that you are welcome to that already has the fluid in it!.
    .....or you would be welcome to use my Harmonizer if you would like...or both.

    Ken F
    IBA #44567
    "Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."
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  5. #5
    It's a way of life! oldnslow's Avatar
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    I know there are electronic devices, but making the thing and showing my son how it works is part of the process. Plus, I get a kick out of 'old skool' stuff that works well!
    Mike Davis
    "Old n Slow" It's a way of life!
    1985 K100RT

    1998 R1100RT

  6. #6
    IBA #44567 Ken F's Avatar
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    Mike, I understand exactly what you are saying.
    Try this link, I think you will have a pretty good understanding.
    Ken

    http://www.powerchutes.com/manometer.asp
    IBA #44567
    "Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."
    -Albert Eienstein

  7. #7
    R100GS, '89 Guenther's Avatar
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    According to physics gas pressure is the same everywhere in an enclosed chamber.

    So unequal lengths of the tubes do not make a difference.

    /Guenther

  8. #8
    It's a way of life! oldnslow's Avatar
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    Quote Originally Posted by Guenther View Post
    According to physics gas pressure is the same everywhere in an enclosed chamber.

    So unequal lengths of the tubes do not make a difference.

    /Guenther
    Bingo! Thanks.
    Mike Davis
    "Old n Slow" It's a way of life!
    1985 K100RT

    1998 R1100RT

  9. #9
    Small road corner junkie pffog's Avatar
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    Quote Originally Posted by Guenther View Post
    According to physics gas pressure is the same everywhere in an enclosed chamber.

    So unequal lengths of the tubes do not make a difference.

    /Guenther
    What he said.
    2010 F800GS Full Ohlins package, '04 R1100S Replika
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  10. #10
    Registered User 36654's Avatar
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    Quote Originally Posted by Guenther View Post
    According to physics gas pressure is the same everywhere in an enclosed chamber.

    So unequal lengths of the tubes do not make a difference.

    /Guenther
    Since you're making a measure of an unsteady pressure, it would be preferable to have the tubes of equal length, as short as possible and restrict their moment. On small differential pressure measurements, tube vibration can be problematic due to the inertia of the fluid column.

    Typical test practice is to mount your transducer as close as possible to the measurement point.
    Cave contents: 99 R11RS, 2013 Toyota Tacoma, 03 Simplicity Legacy, 97 Stihl FS75, Dewalt DW625 & DW744

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