cracked rods

blacksnapon · Jun 2, 2007

OK folks, in NEW model engine technology, what is a cracked rod?

Blue Goose · Jun 2, 2007

What is a cracked rod? I guess a POS is not the answer you're looking for...confused

6L PWR · Jun 2, 2007

A rod out of a Duracrap or Cummapart that tried to race CodySchmoe or Me??

Brian_B · Jun 2, 2007

I don't know specifially what the term means, but sounds expensive to fix.

mrfixit · Jun 4, 2007

A "Cracked Rod" is actually a Powdered Metal Rod, or PMR. Also called "cracked" because the process that creates them is called "fracturing", creating rod and cap simultaneously.

blacksnapon · Jun 4, 2007

Very good! The rod and cap are one piece until they are separated along a scored mark. There is a pattern left in the "broken" edges that when re-assembled, keeps the cap from "walking" on the rod.

mrfixit · Jun 4, 2007

I had to get up to date on those because of the powerstrokes...

mrxlh · Jun 4, 2007

blacksnapon said:
Very good! The rod and cap are one piece until they are separated along a scored mark. There is a pattern left in the "broken" edges that when re-assembled, keeps the cap from "walking" on the rod.

Wow learn something new everyday. I thought all forged rods were broached from 1 piece.

mrfixit · Jun 5, 2007

They may be, but the uniqueness lies in the cracking/fracturing that makes an irregular surface that mates securely, rather than cut and machined smoothe.

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cracked rods

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