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  1. #1
    Registered BajaRunner's Avatar
    My Boats:
    I aint got $hit
    Join Date
    Nov 2001

    what exactly is resizing rods???

    Probably a dumb question, but what is the process of resizing rods. I always here it and just want to know what is done in that process.

  2. #2
    Platinum Member Platinum Member CIG3's Avatar
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    Join Date
    Jan 2001
    Grand River, Ohio

    Re: what exactly is resizing rods???

    They take material off of the rod cap and re-machine by honing to set the rod clearance. There is a little more to it but that is the basic idea. If you have floating pins the clearance would be set for those as well.

  3. #3
    Charter Member Charter Member Ted G's Avatar
    My Boats:
    Marlago 35 FS, 18 Neptune CC
    Join Date
    Jan 2001
    Edgerock Baby!!

    Re: what exactly is resizing rods???

    Cutting the big end and the small end over again to make sure they are perfectly round at a certain spec.
    Chesapeake Bay Powerboat Association

  4. #4
    Join Date
    Oct 2005
    Waldorf, Md

    Re: what exactly is resizing rods???


    The large end of the rod has to be round and a specific size in order to hold the rod bearing in place and make sure it is perfectly round. After many hours of running, the rod usually distorts some from the factory dimension. This generally does not cause a problem as the engine ages because the distortion is gradual and allows the rod bearings to wear slightly and not fail. Depending on how bad the distortion is, if a new bearing is installed in the rod, it can be distorted bad enough that it will fail soon after the engine is rebuilt. So ... you resize the rods.

    To "resize" the rod, the bolts are removed, then a small amount of metal is ground off the rod and the cap where they mate together. Then the bolts are reinstalled and torqued in place. Because of the metal removal, the big end is now smaller than when you started. Next you resize the large end back to the factory size using a machine called a "rod hone" .

    That is a simplified explaination. Hope it helps.

    Bill Koustenis
    Advanced AUtomotive Machine
    Waldorf Md

  5. #5
    Registered Big Block Billy's Avatar
    My Boats:
    Formula242ls and others
    Join Date
    Jun 2001
    Babylon N.Y.

    Smile Re: what exactly is resizing rods???

    Rods should also be re-sized after installing new bolts such as ARP, SPS. It's be a good time to put in new / Better bolts if you are going to have the rods resized.
    This should be done with a press by a qualified machine shop. BBB

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