Painted Connecting Rods?
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Re: Painted Connecting Rods?
REM polish
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I know as much as I can learn and try to keep an open mind to anything!
If I didn't overthink stuff I wouldn't be on speedtalk!
Re: Painted Connecting Rods?
Polished rods were a common deal in the 60’s.swampbuggy wrote: ↑Thu Jun 25, 2020 5:45 pm Here is a question i have.....Is it OK to polish a steel piece such as the sides of a shot peened steel H-Beam Con-Rod Mark H
I did a 330 Olds several years ago and polished the 403 rods.... might even do it to my new SBM...
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Re: Painted Connecting Rods?
===========.swampbuggy wrote: ↑Thu Jun 25, 2020 5:45 pm Here is a question i have.....Is it OK to polish a steel piece such as the sides of a shot peened steel H-Beam Con-Rod Mark H
If the part is properly shot peened then polishing is OK ONLY if less than 10% of the compressed layer is removed.
This 10% limit on material removal after peening is similar to what used to be stated in older revs of MIL spec 13165. (rev C cancelled).
I think it was 10% of "intensity".
"Properly" shot peened is defined in MIL STD 13165 Table VI ( intensity) .
If the goal of polishing is to improved fatigue resistance , why bother ?
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Re: Painted Connecting Rods?
The dimples will be shallower on rods made of harder steel.swampbuggy wrote: ↑Thu Jun 25, 2020 9:56 pm Kevin, i was thinking hand sanding w/ 320-400-600. If you look at a Carrillo, Oliver, Crower, or Pankl that has been shot peened the surface is really not very rough. It is most likely a waste of time anyway ?? Mark H.
My recollection is many garden variety stock rods peened to the proper Almen intensity .008 - .012 A looked more deeply dimpled than say, Carillo rods.
All "looked" shot peened, as strictly opposed to the satiny finish of fine glass beaded.
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Re: Painted Connecting Rods?
I`ve always beamed and polished stock rods and then shot peened after, to put a hardened surface back on where I polished.
Re: Painted Connecting Rods?
Yes, if polishing is in the plan it should always be done before shot-peening.
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