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Thread: Buick Straight 8 Billet Connecting Rods

  1. #1

    Buick Straight 8 Billet Connecting Rods

    Hello All,

    For our current land speed motor, we are running a shortnened stroke crankshaft. Therefore we needed custom length rods to make everything work. So we designed these rods, which are .343 longer than stock, use a .927 Pin, Big Block Chevy Crank pin size, etc. Feature cap screw bolts, with hollow dowells. We designed them in Solidworks Cad Software, and ran simulation on the rods, and tweaked with the design to get optimum strength without a heavy rod. The stock rods are actually fairly light, and strong, and the ones we designed are 30 grams lighter. Here is some photos before they went to heat treat.

    The design on the compute before we ever started to cut anything!


    Finished rods:










    Going to heat treat:



    Cap




  2. #2
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    What is the function of the small ridges?
    Did you run the simulations in finite analysis software?
    When better Automobiles were built, Buick built Straight 8's

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    and Buick Club of Australia

  3. #3
    Yes. Fea testing in solidworks simulation.

  4. #4
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    Those are really nice. It's hard to find anybody who will even attempt to make custom Buick stuff. We had to sort of redesign our engine stuff around the common Chevy stuff. Had to cut the journals down to Chevy size and then have the sides welded for side clearance. So far so good. Seems to be holding together. So far 4 years with these and no failures.
    Doug
    Attached Images Attached Images

  5. #5
    Now that is impressive . cannot wait to see how you go next attempt any idea on cost for these rods or are they just a one off.

  6. #6
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    Those rods are beyond beautiful!
    What alloy are they?

    Ray

  7. #7
    These are 17-4 Stainless.

  8. #8
    For the right guy we would build a set. Pricing would be inline with what carillo and such charges.

  9. #9
    i have a basic design question:
    why are so many rods designed with the big end split perpendicular to the long axis of the rod? is it simply the aesthetic desire for symmetry or is there a structural purpose?

    some of the diesel rods are going to an oblique split, such as this:
    http://galleryplus.ebayimg.com/ws/we.../1000x1000.jpg
    1000x1000.jpg


    which, it seems to me would be FAR stronger than a perpendicular split. i mean, how could the bolt threads possibly be stronger that the cross section of the bolt itself?
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  10. #10
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    Quote Originally Posted by bob k. mando View Post
    i have a basic design question:
    why are so many rods designed with the big end split perpendicular to the long axis of the rod? is it simply the aesthetic desire for symmetry or is there a structural purpose?

    some of the diesel rods are going to an oblique split, such as this:
    http://galleryplus.ebayimg.com/ws/we.../1000x1000.jpg
    1000x1000.jpg


    which, it seems to me would be FAR stronger than a perpendicular split. i mean, how could the bolt threads possibly be stronger that the cross section of the bolt itself?

    larger crank dia. ? if it was straight across, you could not get it out of the block. some diesels you have to pull the liner with the piston/rod.
    52 Special.
    Tin Militia CC

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