machining rod journals
machining rod journals
(OP)
Is there any risk to machining the rod journals on a crank (forged steel) to suit 2" (50.8mm) small journal chev rods. The standard rods have BE which are 51.9938mm.
I'd be looking at nitriding or cryo treating the crank. COmments on the latter is welcome.
I'd be looking at nitriding or cryo treating the crank. COmments on the latter is welcome.





RE: machining rod journals
Might not be a big deal if :
- proper radius is maintained
- Crank is up to the task at standard size
- crank is magnafluxed to assure it is free of surface cracks
- Harmonic damper is installed if necessary
- nitriding is a nice addition for scuff resistance and increased fatigue strength
RE: machining rod journals
Increasing radii at the journal to crank arm interface and nitriding will both help considerably to improve durability.
You could also off centre grind it to increase the stroke at the same time.
Grinding may, with some luck, remove any small cracks that may have been the start of a failure.
Cryo treatment is gaining popularity, but I am yet to see compelling scientific data to support it's claimed virtues.
Regards
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RE: machining rod journals
RE: machining rod journals
Larry
Larry Coyle
Cylinder Head Engineering, LLC
www.cylinderheadengineering.com