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Join Date: Dec 2002
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So, was it ever determined what, exactly, caused the ARP rod bolt to fail? Was it overtorqued? Was there a defect? It would be very unusual to find a manufacturing defect in that bolt...
Old 01-06-2005, 01:57 PM
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Rob,

Maybe Tristan will chime in on this one, but having been with him for most of the assembly, I doubt it was overtorqued. More than likely it was defective.
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Old 01-06-2005, 04:57 PM
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I'll extend an offer to whoever has the bolt, if it's still available: Send me *really* good close up pics of the fracture surface (both of them) and I'll do my best to tell you what's going on. Better yet, contact me offline and mail me the bolt and I'll examine it here, with our metallurgist who specializes in failure analysis, and we'll try to diagnose the cause. And then I'll return the bolt.

I'm motivated; I have ARPs in my engine too...
Old 01-06-2005, 05:02 PM
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Rob,

The bolt never fractured, it just "stretched" to the point where it was obvious that it was failing.
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2008 Yamaha R6
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1999 Spec Miata
1996 993 RS Replica
1971 Norton 750 Commando
Alcon Brake Kits
Old 01-06-2005, 05:10 PM
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I would still love to see an independent metalurgical analysis performed on it.
Old 01-06-2005, 05:46 PM
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You and me both. If one sent to a consumer can fail, how does one check...
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2008 Yamaha R6
2001 GT3 Cup - "Pepin"
1999 Spec Miata
1996 993 RS Replica
1971 Norton 750 Commando
Alcon Brake Kits
Old 01-06-2005, 07:26 PM
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Oh, that's right. I forgot that you didn't actually fracture the bolt. Well, there's still the potential for plenty to be learned by an examination, if you're interested. There are various tests that can be conducted, some of which are destructive (metallography to examine microstructure and chemical analysis to evaluate the chemical makeup and proportion of alloying elements). It's possible that just a visual, nondestructive exam under an optical microscope, and maybe a hardness test, will tell a lot about what has happened. Let me know if you're interested.
Old 01-07-2005, 09:25 AM
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I'll forward to the "owner" of the bolt.
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2008 Yamaha R6
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1999 Spec Miata
1996 993 RS Replica
1971 Norton 750 Commando
Alcon Brake Kits
Old 01-07-2005, 02:11 PM
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for entertainment,
Jim Sims posted some interesting info

"deburred using a powered hand held emery wheel (something like a Dremel tool). Below is an image of a silver plated (for clean thread lubrication) MP35N alloy screw with safety wire holes. This is among the best fasteners our civilization knows how to make: 260,000 psi strength and very corrosion resistant - it will function in seawater and at liquid nitrogen temperatures. Expensive as sin (35% colbalt); the bolt shown was $136. If one orders the best "aerospace alloy" engine rod bolts, etc. this is the alloy one is likely to get, although some of the vendors may be switching to the almost as good but cheaper Carpenter 625. Happy preloading!"

washers for SC axle bolts

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Old 01-11-2005, 04:29 AM
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SPS Carrillo rod bolts are made of the same mp35n alloy, the best rod bolt on the planet!
Old 01-11-2005, 04:46 AM
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Lookit those threads! Smooth as boobies.
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Old 01-11-2005, 07:43 AM
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I always hate to put the SPS bolts back in my Carillo rods, I just like to just sit and look at them, they are a work of art.
Old 01-11-2005, 02:58 PM
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