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Tachometer accuracy

Discussion in '206/246' started by daviekj, Oct 17, 2010.

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  1. daviekj

    daviekj Formula Junior
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    May 9, 2008
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    #1 daviekj, Oct 17, 2010
    Last edited by a moderator: Sep 7, 2017
    While checking the dynamic ignition advance I took the opportunity to compare the Dino tachometer RPM reading with the Snapon digital timing light. Although both take the same trigger, the Dino tacho must have a mechanical component. They look to be in close agreement with each other. Perhaps there is a slight gradient difference, but nothing to worry about.

    Kevin
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  2. alhbln

    alhbln Formula 3
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    Adrian
    #2 alhbln, Nov 5, 2010
    Kevin,

    i checked mine with a Tek CFG280 on the workbench, quite precise below 6K RPM but after that the Veglia displayed the RPM 10% lower than the actual value - oops. I don't have the special tools to refit/crimp back on the bezel so i didnt do a full calibration, just have to keep this in mind when getting near the red line.

    The tach needle sits on a spindle which has a spiral retaining spring. If the oil gets sticky you might see the symptoms you have described. You tach's curve looks quite good though.

    Adrian
     
  3. dignini

    dignini Formula 3

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    Luigi Marazzi
    #3 dignini, Nov 5, 2010
    so an indicated 7800 rpm is really close to 8500 rpm?
     
  4. alhbln

    alhbln Formula 3
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    #4 alhbln, Nov 5, 2010
    Exactly, but thats just what i have measured. Don't think that this is a general behaviour of old Veglia tachs.
     
  5. synchro

    synchro F1 Veteran

    Feb 14, 2005
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    Scott
    #5 synchro, Oct 17, 2015
    Are there internal calibration pots?
     
  6. alhbln

    alhbln Formula 3
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    #6 alhbln, Oct 31, 2015
    Yes, there is one!
     

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