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Technical Applying a Rev counter on a LZ V12

Discussion in 'The Hokey Ass Message Board' started by Mathis25, May 6, 2019.

  1. Mathis25
    Joined: Jul 21, 2012
    Posts: 21

    Mathis25
    Member
    from Sweden

    Hi,

    I am building a new car. One challenge is to connect the rev counter. Is there someone who has an experience or ideas how to applying a mechanical rev.counter on a Lincoln Zephyr V12? Lincoln V12 Engine & Blower.jpg
     

    Attached Files:

  2. Cant help you on the rev counter but damn that is awesome !!! :eek:
     
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  3. Some sort of an industrial rev counter that can count revolutions on a rotating shaft or pulley maybe?

    Sent from my moto g(6) play using The H.A.M.B. mobile app
     
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  4. Ned Ludd
    Joined: May 15, 2009
    Posts: 3,842

    Ned Ludd
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    Last edited: May 7, 2019
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  5. 340HilbornDuster
    Joined: Nov 14, 2011
    Posts: 1,742

    340HilbornDuster
    ALLIANCE MEMBER

    Your Hot Rod is insanely Cool....
    .....Skit Läcker!!!
    S'more Pictures? tapatalk_1557217898015.jpeg

    Sent from my SM-G930T using The H.A.M.B. mobile app
     
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  6. oldolds
    Joined: Oct 18, 2010
    Posts: 2,689

    oldolds
    Member

    Some tachs drive off a generator or alternator as mentioned above.
     
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  7. Mathis25
    Joined: Jul 21, 2012
    Posts: 21

    Mathis25
    Member
    from Sweden

    No problem and I appreciate the feedback on the car :)
     
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  8. Mathis25
    Joined: Jul 21, 2012
    Posts: 21

    Mathis25
    Member
    from Sweden

    (Tack så mycket :) )Thanks a lot for the positive feedback on the car
     
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  9. Mathis25
    Joined: Jul 21, 2012
    Posts: 21

    Mathis25
    Member
    from Sweden

    Thanks a lot for the

    Thanks a lot for taking the time finding the useful links. Very much appreciated :)
     
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  10. Mathis25
    Joined: Jul 21, 2012
    Posts: 21

    Mathis25
    Member
    from Sweden

    Thanks :)
     
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  11. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 4,596

    Ebbsspeed
    ALLIANCE MEMBER

    Evidently a skilled builder, so I think you should be able to do something with toothed belts and a couple pulleys. I assume your tachometer needs to run at half engine speed, as most mechanical tachometers are driven off the camshaft/distributor. Since you have access on the front of the engine/supercharger to a shaft that turns at crankshaft RPM, you need to cut that speed in half. Below is a link to one of many vendors that can provide timing belts and pulleys to cut the speed in half. You will likely have to increase the bore in the pulley you put on the supercharger shaft, and figure out the mounting, tach cable drive, etc, but as I mentioned earlier it appears the skill to do this is available.

    https://www.sdp-si.com/products/Timing-Belts-and-Cables/index-2018.php
     
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  12. Ned Ludd
    Joined: May 15, 2009
    Posts: 3,842

    Ned Ludd
    Member

    The other way would be to do a custom face on a conventional electric 8-cylinder tachometer. The tachometer would overread by 50%, but your V12's redline is probably ⅔ of a typical modern V8's. That would also afford the opportunity to design a dial face which is visually appropriate to your build.
     
  13. porknbeaner
    Joined: Sep 12, 2003
    Posts: 40,967

    porknbeaner
    Member

    You can drive a mechanical off the cam snout with a doubler. Or you can get a mechanical tach (rev counter?) drive that drives off the back of the generator like they used on the early corvettes. The drive for the cam snout may be easier to come by.
     
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  14. Mathis25
    Joined: Jul 21, 2012
    Posts: 21

    Mathis25
    Member
    from Sweden

    Thanks a lot for the advice, link and the suggested solution. Seem doable with some changes to existing config and some efforts :)
     
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  15. Mathis25
    Joined: Jul 21, 2012
    Posts: 21

    Mathis25
    Member
    from Sweden

    Aha! Using generator shaft is not a bad idea :) I will check and investigate if that is a possible solution -Thanks a lot.
     
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  16. Mathis25
    Joined: Jul 21, 2012
    Posts: 21

    Mathis25
    Member
    from Sweden

    Thanks and I agree this could be an option as well :)
     
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  17. Mr48chev
    Joined: Dec 28, 2007
    Posts: 25,027

    Mr48chev
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    It won't work in your application but they did have crank driven speedometer drives for flatheads.
    Photo of one here http://builda32fordroadster.blogspot.com/2011/03/stewart-warner-mechanical-tach-drive.html
    There are also mechanical tach drive setups for Tractors that with some imagination could be Adapted.fast
    This setup fastened to the back of the generator on a Ford tractor but the box and drive gear should be available there without a hassle. https://www.ebay.com/i/323763723515?chn=ps

    It seems that many older motorcycles had mechanical tachs with a drive setup that was similar.

    No matter what you use it will take some imagination but I think you are more than up to that part.
     
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  18. Mathis25
    Joined: Jul 21, 2012
    Posts: 21

    Mathis25
    Member
    from Sweden

    Thanks a lot! This is really good stuff and thanks for the links. I am sure I will works something out with all the advice and possible solution from this Forum. Really big help.
     
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  19. Elvis100
    Joined: May 21, 2016
    Posts: 220

    Elvis100

  20. chrisp
    Joined: Jan 27, 2007
    Posts: 750

    chrisp
    Member

    Hold on, is there a build thread of that thing? Looks fantastic!!
     
  21. 340HilbornDuster
    Joined: Nov 14, 2011
    Posts: 1,742

    340HilbornDuster
    ALLIANCE MEMBER

    Frame horn / blower snout / C grill / arch, louvers.....just PERFECT..!..

    ....Inte Lagom! Screenshot_20190520-144907.jpeg

    Sent from my SM-G930T using The H.A.M.B. mobile app
     
  22. 340HilbornDuster
    Joined: Nov 14, 2011
    Posts: 1,742

    340HilbornDuster
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