 Rod bolts - a few questions and discussions |
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| ahdoman |
  Sep 21 2009, 03:40 PM
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#1
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It's phonetic...Ah-D-O-Man (Audioman)  Group: Members Posts: 667 Joined: 7-November 05 From: Santa Clarita, Ca. Member No.: 5,084 Region Association: Southern California  |
According to the experts it's imperative to replace the rod bolts when rebuilding. I've read the reason is because when they are torqued originally they stretch? Are they manufactured specifically to do that? If so, why wouldn't that make them weak? If reused why is that any different from reusing other bolts or parts under high torque? What's the science and logic behind this?
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| brp986s |
Sep 21 2009, 10:22 PM
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Member Group: Members Posts: 434 Joined: 27-September 07 From: los angeles Member No.: 8,167 |
ARP is up in ventura. I went up there and bought one their stretch gauges and picked up a catalog, which I think is downloadable that answers your questions. My recollection is that when a bolt is torqued the tension initially ramps up rapidly, but then that rate fades as the bolt stretches. When the proper tension is attained, the bolt stretches, but is not deformed, and static tension is much higherr than cyclic variation the bolt would see when the engine is running. If the reverse were true, the cyclic loading would fatigue and break the bolt.
If you buy a set of their bolts, you'll be impressed with the quality - this ain't flaps hardware. No connection. |
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Posts in this topic
ahdoman Rod bolts - a few questions and discussions Sep 21 2009, 03:40 PM
SLITS Rod bolt are true "stretch bolts" and ar... Sep 21 2009, 03:54 PM 9146986 At least replace the rod nuts, I wouldn't scri... Sep 21 2009, 08:28 PM
76-914
ARP is up in ventura. I went up there and bought... Sep 25 2009, 09:46 PM ME733 :popcorn: IN stock standard form the rod bolts..a... Sep 25 2009, 09:12 PM ClayPerrine
Bet you have never even seen a "914 porsche... Sep 27 2009, 11:59 AM ME733 :popcorn: Rod Bolt stretch Guage....use....The gua... Sep 26 2009, 10:11 AM 76-914 Thx for taking the time to describe how this is us... Sep 26 2009, 12:25 PM brp986s :deadhorse:
the beauty of using a stretch gauge ... Sep 26 2009, 01:50 PM Cap'n Krusty All fanciness aside, I would NEVER assemble ANY 91... Sep 26 2009, 03:31 PM John Jentz I once asked Jake Raby if he thought stock used ro... Sep 27 2009, 11:06 AM |
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