Billet metal specialist thread (we argue cause we are dense)

Bdsankey

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Feb 1, 2018
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Mark, do you know if anyone has sent rods in for analysis? Did they go back to Carrillo or an independent party? I would be interested to hear what was determined to be the cause of the failure. It would be nice if someone could send a failed rod or three to Mat to let him take a look. With his knowledge in metallurgy, engineering, and engines, I bet he could give some reliable information that would be untainted by a monetary influenced bias.

As for the comment on the Carrillo HD rods, it was my understanding they were only making those for the Cummins crowd right now.

At UCC they had a set there for a hybrid kit in the Duramax. They came out 4 months after I ordered my hybrid kit (standard Carrillo rod structure/thicknesses). From my understanding, they are available for order as they are listed in the product sheets on their website.

See the image below.
 

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MarkBroviak

DMax Junkie
May 25, 2008
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Mark, do you know if anyone has sent rods in for analysis? Did they go back to Carrillo or an independent party? I would be interested to hear what was determined to be the cause of the failure. It would be nice if someone could send a failed rod or three to Mat to let him take a look. With his knowledge in metallurgy, engineering, and engines, I bet he could give some reliable information that would be untainted by a monetary influenced bias.

As for the comment on the Carrillo HD rods, it was my understanding they were only making those for the Cummins crowd right now.

I'm not sure but I figure Guy will be sending Mike's rods straight back to Carillo for analysis after he looks them over. I'm not sure on Tony's but I'll ask. I couldn't agree with you more on this Josh, Mat is definitely someone to lean on in this situation for some addition info that we just won't get anywhere else.
 

Ne-max

I like turtles
Nov 15, 2011
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That's what sucks about performance. It's always hard to tell. I don't see Carrillo admitting fault either way. But also many things can cause it. It just had me wondering if there was not just a bad batch recently. Like Evan said. It could have just been odd timing for many to fail recently. I'm going to be using a set in a 800hp build I'm doing soon on a project.
 

Bdsankey

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Where all these rods new? Do we have any idea if they were purchased within a few months of each other? That would bring some validity to the "bad batch" theory.
 

IdahoRob

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Jun 5, 2007
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The rpms aren’t an issue at all. If it was we would be spinning bearings. Cylinder pressure/torque is what gets them in trouble.

Mark, did the rod bend or did it separate/fracture? You mentioned that the piston was still in the bore. I have had gas engines fracture rods from over revving. Just curious.
 

MarkBroviak

DMax Junkie
May 25, 2008
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Danville Indiana
Mark, did the rod bend or did it separate/fracture? You mentioned that the piston was still in the bore. I have had gas engines fracture rods from over revving. Just curious.


Without seeing it myself I would have to guess it fractured at the small end of the rod because the piston was still intact and in the bore but the rod connected to the crank did some serious damage.