Quote:
Originally Posted by 72LuxuryLeMansLa.
I was told by a machinist that the small ends on the rpm floating rods are manufactured slightly tight so that they can be accurately fit to the pins depending on the application. True or not?  Just what I was told. |
I think this is a reasonable assumption by your machinist. We are generally talking about .0001-.0003". That's a stroke or two on a rod hone and once set-up, takes less than a minute per rod. It is MUCH easier to hone a big or small end just a touch than to make the hole smaller. Making the ends smaller is a whole ordeal and with aftermarket rods, usually means returning them for replacements. If special order and you have already waited weeks for them, the shop will generally fix them. It can take two hours to fix a full floating rod if the big end and small end are both too big. Removing the bushing, pressing in a new one, de-burr, chamfer, re-hone the ID, it all takes time. The big end, take apart, remove guide bushings if cap screw, grind both parting surfaces, de-burr, clean, re-assemble and hone is allot of work. If really screwed-up, the center to center of the repaired rod will be off a little when done. That's just the way it goes. A street engine will never know the difference. A race engine running a super competitive class like NHRA Stock or Super Stock, it could cost you a HP or two. I always recommend buying the very best parts you can afford and then have them checked anyway.
01-12-2019, 12:37 PM
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