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Bonneville Hawks 1963 rear axle gear ratios

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  • Rear Axle: Bonneville Hawks 1963 rear axle gear ratios

    Does anyone know if the Bonneville Hawks used the ' standard' 3.73 Differential that 'came with' an R 2 engine to go 140 MPH, or did they drop a ratio or two, to get that higher top speed of 140 MPH ...? Thanks in advance...

  • #2
    While not an exact answer.... Somehwere in between here: Gear ratios range from 2.72:1 to 5.89:1
    HTIH (Hope The Info Helps)

    Jeff


    Get your facts first, and then you can distort them as much as you please. Mark Twain



    Note: SDC# 070190 (and earlier...)

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    • #3
      I have a 3.73 gear in my Avanti and I don't think the the engine could push the car to 140MPH before the engine runs out of RPM. I would think that a 3.07 gear was used to get that speed. Bud

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      • #4
        You can go here and do the calculating for yourself:
        http://www.csgnetwork.com/rearendgearcalc.html

        With a 1-1 ratio in top gear and 27 inch tall tires, you'd need a 2.73 rear end @ 5000 RPM to exceed 140.

        You'd need to go 6500 with a 3.73 rear end to hit 140 with 27 inch tires.

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        • #5
          Originally posted by Bud View Post
          I have a 3.73 gear in my Avanti and I don't think the the engine could push the car to 140MPH before the engine runs out of RPM. I would think that a 3.07 gear was used to get that speed. Bud
          Right, Bud; IIRC, that's what they had. BP
          We've got to quit saying, "How stupid can you be?" Too many people are taking it as a challenge.

          Ayn Rand:
          "You can avoid reality, but you cannot avoid the consequences of avoiding reality."

          G. K. Chesterton: This triangle of truisms, of father, mother, and child, cannot be destroyed; it can only destroy those civilizations which disregard it.

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          • #6
            What did Ron Hall use in his car?
            Attached Files
            "In the heart of Arkansas."
            Searcy, Arkansas
            1952 Commander 2 door. Really fine 259.
            1952 2R pickup

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            • #7
              We set the record using a 3.0 gear. The initial run in 93 used a 2.75 ratio and the engine would not pull it. Power met resistance at about 188 MPH. At 200 the engine was turning about 7100 RPM. The car has a Ford 9" from a Lincoln Versailles.
              Last edited by jpepper; 11-09-2017, 09:48 AM. Reason: add more comment
              james r pepper

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              • #8
                The 3.07 ish range is what were we thinking . I have yet to DRIVE mine, so i was not sure what speeds it would do vs RPM's .Thanks

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                • #9
                  Those rear tires look very tall in the Bonneville pic from the sixties. Seems like maybe they were indy car tires....18" rims?
                  Diesel loving, autocrossing, Coupe express loving, Grandpa Architect.

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