bill jones wrote: ↑Sun Sep 29, 2019 8:14 pm ---this left side picture is a Carrillo rod with one crack---and the second picture is a Carrillo rod with 3 cracks between the red marks.
---two different engines from good late model stock car 8000rpm engines in the late 1970's.
---both engines had two full seasons of short oval track racing.
---this was when we could only get about 13 honest races out of any engine with fully prepped stock rods and making about 500hp.
---so we were happy to be able to get two full years and finding these cracks were our best way of saving our engines.
---those cracks go over under the rod bolt head and down into the hole about the same distance
Service Life of Steel H-Beam Rods
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Kevin Johnson
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Re: Service Life of Steel H-Beam Rods
It appears that the bolt "flange" or outer head circumference is not matched to the rod and caused a stress raiser leading to the cracks. If you examine modern Carrillo rods this is not present.
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bill jones
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Re: Service Life of Steel H-Beam Rods
---Those rod bolts are some odd stuff I had---I saved the Carrillo WSB bolts---and now I have the cracked rods honed & sized on both ends to use as a standard for setting up my AG300 Sunnen gauges.
---so these particular bolts had nothing to do with the rods in engine they were in.
---so these particular bolts had nothing to do with the rods in engine they were in.