TwinTurbo.NET: Nissan 300ZX forum - The threads are rolled. Like you, I hoped this would
Subject
The threads are rolled. Like you, I hoped this would
Posted by
LitlElvis
on April 06, 2010 at 7:54 AM
This message has been viewed
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In Reply To
Yes they stretch
posted by Brad(RI)
on April 05, 2010 at 06:53 PM
Message
increase the strength enough at that point to allow the bolt to break in the middle of the shank but it didn't.
Follow Ups
Stock head bolt tensile tests >>>
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LitlElvis
17:19:23 04/05/10
have you tested the replace ARP studs for reference?
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Carlos Ramirez
17:37:15 04/05/10
ARP lists their standard 8740 studs to be 200ksi
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LitlElvis
17:47:04 04/05/10
Interesting...
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Gold300zx
17:38:36 04/05/10
I'm curious, was the breakpoint at the nut, or does it have
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zellamay
17:53:55 04/05/10
it's more to do with the start of the threads
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LitlElvis
21:37:58 04/05/10
To clarify, if the threaded portion was longer, and the
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zellamay
21:59:16 04/05/10
it will break where the threads start to form on the shank
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LitlElvis
22:05:54 04/05/10
Thanks, you have been very informative. (n/m)
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zellamay
23:14:59 04/05/10
So the bolts dont really stretch? Just break.... (n/m)
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ZXoltan
18:37:31 04/05/10
Yes they stretch
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Brad(RI)
18:53:41 04/05/10
The threads are rolled. Like you, I hoped this would -
LitlElvis
07:54:18 04/06/10
Out of curiosity...
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Obeeone
19:13:36 04/05/10
Re: Out of curiosity...
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Brett@AwesomeZ
19:31:20 04/05/10
Re: Re: Out of curiosity...
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Brett@AwesomeZ
19:32:30 04/05/10
The graphs and some math tell the tale that you want to see
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LitlElvis
22:03:39 04/05/10
This is not about outright failure of head bolts
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LitlElvis
21:50:30 04/05/10
Never seen one issue with the factory head bolts yet (n/m)
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Seb@Specialty-Z
22:36:43 04/05/10
Seb, what's the highest HP you have run with stock bolts? (n/m)
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ZXoltan
07:45:11 04/06/10
a little over 1000 BHP (n/m)
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Seb@Specialty-Z
10:12:31 04/06/10
Do you guys recommend the stock head gaskets or MLS styles?
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KongZTT GT28RS MD
01:48:13 04/07/10
Exactly, it's not about breaking bolts
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Brett@AwesomeZ
00:44:29 04/06/10
typically, fasteners are preloaded to 75% of yield strength
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LitlElvis
07:16:53 04/06/10
I thought stock head bolts fell into this stretch category. (n/m)
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Antihero
08:36:50 04/06/10
All fasteners stretch when preloaded, the key is to not
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LitlElvis
11:56:01 04/06/10
the new ARP L19 hardware...
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KongZTT GT28RS MD
01:54:07 04/07/10
You have an instron in your shop? Impressive! (n/m)
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Scotts94z32
11:44:26 04/06/10
It's not mine, I just get access to it :-) (n/m)
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LitlElvis
12:07:25 04/06/10
What adjustment factor do you apply to the steel>>
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ZUL8TR
14:37:31 04/06/10
This is perfect.. I have been thinking of pulling
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KongZTT GT28RS MD
01:41:27 04/07/10
err.. L19 (n/m)
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KongZTT GT28RS MD
01:46:06 04/07/10
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