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Speedometer in reverse

Discussion in 'Tech Discussion' started by 73c20jim, Nov 6, 2018.

  1. 73c20jim

    73c20jim Supporting Member Supporting Member

    Age:
    74
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    Joined:
    Jun 11, 2018
    Location:
    Tombstone, AZ
    First Name:
    Jim
    Truck Year:
    1973, 1973
    Truck Model:
    C20 2WD Custom Deluxe. C10 Base Model
    Engine Size:
    350 CID 195/260 HP Goodwrench crate, 400 CID
    Should speedometer read backwards ( goes down past 0) in reverse????
     
  2. chengny

    chengny Full Access Member

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    Location:
    NH
    First Name:
    Jerry
    Truck Year:
    1986
    Truck Model:
    K3500
    Engine Size:
    350/5.7
    Maybe a little bit, but because the hairspring is tightly wound when at 0 MPH - and the pointer is connected to the hairspring - it prevents reverse rotation.
     
  3. 73c20jim

    73c20jim Supporting Member Supporting Member

    Age:
    74
    Posts:
    1,050
    Likes Received:
    419
    Joined:
    Jun 11, 2018
    Location:
    Tombstone, AZ
    First Name:
    Jim
    Truck Year:
    1973, 1973
    Truck Model:
    C20 2WD Custom Deluxe. C10 Base Model
    Engine Size:
    350 CID 195/260 HP Goodwrench crate, 400 CID
    Evidently not mine.
     

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