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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: re-using 4AGE head bolts?
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Sat, 20 August 2005 08:24
 
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just for the record,
normal head bolts, when torqued to their spec, will not plastically deform as ther strength is higher than the torque specs/clamping force. they may creep a little over time, but they should still be ok to re-use. for any serious motor you would always use new bolts.
torque to yield are exactly that. usually the main part of the bolt has a reduced diameter, so that when you torque to their spec, and then that little bit more, the bolts plastically deform, REDUCING the clamping force to that which the bolt can withstand without deforming.
the reason you can't re-use them as torque-to-yield is twofold..
one, when the bolts deform, they may work harden a little and gain strength, so that when you torque to the spec'd yield load, they will actually have higher clamping force.
or two, they workharden and do not gain strength, but they DO lose the ability to elongate (ie their %plastic deformation was used up last time), so that they will break when torqued to spec, as they ar eno stringer, and the plastic deformation caused results in failure...
or something like that...
[Updated on: Sat, 20 August 2005 08:25]
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| | Subject | Poster | Date |
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re-using 4AGE head bolts?
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TE72_Turbo | Sun, 04 August 2002 10:29 |
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Re: re-using 4AGE head bolts?
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jazae86 | Sun, 04 August 2002 11:23 |
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Re: re-using 4AGE head bolts?
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Grega | Sun, 04 August 2002 11:46 |
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Re: re-using 4AGE head bolts?
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jazae86 | Sun, 04 August 2002 12:11 |
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Re: re-using 4AGE head bolts?
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Rex_Kelway | Sun, 04 August 2002 13:36 |
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Re: re-using 4AGE head bolts?
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BradW | Thu, 18 August 2005 09:34 |
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Re: re-using 4AGE head bolts?
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Steve-AE86 | Sat, 20 August 2005 08:03 |
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Re: re-using 4AGE head bolts?
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oldcorollas | Sat, 20 August 2005 08:24 |
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Re: re-using 4AGE head bolts?
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dorikin | Sun, 04 August 2002 14:40 |
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Re: re-using 4AGE head bolts?
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Grega | Sun, 04 August 2002 22:04 |
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Re: re-using 4AGE head bolts?
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TE72_Turbo | Mon, 05 August 2002 09:08 |
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Re: re-using 4AGE head bolts?
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Nobody | Wed, 17 August 2005 12:08 |
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Re: re-using 4AGE head bolts?
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STR8 2.8 | Wed, 17 August 2005 12:13 |
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Re: re-using 4AGE head bolts?
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Nobody | Wed, 17 August 2005 12:26 |
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Torque to yield bolts
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Nobody | Thu, 18 August 2005 08:13 |
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Re: re-using 4AGE head bolts?
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EVOSTi | Thu, 18 August 2005 10:25 |
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Re: re-using 4AGE head bolts?
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kingmick | Sun, 21 August 2005 04:32 |
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VRS - VALUE regrind
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Nobody | Fri, 19 August 2005 13:40 |
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Re: re-using 4AGE head bolts?
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TE72_Turbo | Sat, 20 August 2005 12:20 |
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Re: re-using 4AGE head bolts?
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Big T | Sun, 21 August 2005 00:21 |
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Re: re-using 4AGE head bolts?
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allencr | Sun, 21 August 2005 03:24 |
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Re: re-using 4AGE head bolts?
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tricky | Sun, 21 August 2005 04:45 |
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Re: re-using 4AGE head bolts?
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EVOSTi | Sun, 21 August 2005 09:55 |
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Re: re-using 4AGE head bolts?
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kingmick | Sun, 21 August 2005 10:15 |
