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Crankshaft weight

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  • Crankshaft weight

    I am getting ready to list a couple NOS cranks online. I never really paid attention before I guess but after weighing them in the box I found that the commander crank, 523137, is at 80 pounds while the 259 crank is at 60 pounds. The 20 pound difference surprised me and as I age it felt more like 50 difference
    Milt

    1947 Champion (owned since 1967)
    1961 Hawk 4-speed
    1967 Avanti
    1961 Lark 2 door
    1988 Avanti Convertible

    Member of SDC since 1973

  • #2
    A shorter stroke 259" crankshaft, with 5 main berrings, and 4 siamiesed connecting rod journals, should be very close, to 3/4 the weight. Of the longer stroke Commander six, with 4 main berrings and 6 individual rod berrings. Why's it such a surprise?

    Mark
    sigpic

    S2Deluxe = (5H - C3).

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    • #3
      Also remember that a Six Cylinder Engine and Crankshaft is LONGER by TWO Cylinders! Probably the Largest reason for being heavier.
      StudeRich
      Second Generation Stude Driver,
      Proud '54 Starliner Owner
      SDC Member Since 1967

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      • #4
        Originally posted by StudeRich View Post
        Also remember that a Six Cylinder Engine and Crankshaft is LONGER by TWO Cylinders! Probably the Largest reason for being heavier.
        Thanks, for the clarification, Rich! That was essentially, what I was trying to say. Although, in a little bit more of a roundabout way.

        Mark
        Last edited by S2Deluxe; 04-24-2020, 06:28 PM.
        sigpic

        S2Deluxe = (5H - C3).

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        • #5
          I just used a chainfall to install a 6 cylinder crank as the last time I did it I pulled some tendons in my fore arm and it took about a year to heal. Ed

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