[Supras] ARP torque; fuel pressure gauge

[berniek at technicaldevelop.com]

PS:  meant to say studs, not bolts.  More info on the Volvo Schrader 
valve would be appreciated.


          Bernie



berniek at technicaldevelop.com wrote:
> Jon:
>
> Your right.  I sometimes think my mind is turning to plastic in my old
> age.  Yes you are correct.  Of course the bolts operate in the elastic
> region.
>
> Bernie
>
>   
>> Bernie,
>>
>> I think you mean the elastic region.
>>
>> I assume these are ARP studs. If so, the latest APP docs I have recommend
>> 80 ft-lbs with ARP moly lube to achieve 75% of fastener yield strength.
>> For the ARP *bolts* they further recommend to derate another 12% for
>> aluminum applications due to higher thermal expansion.  However, the
>> derating is not mentioned in the *stud* docs, which I find odd.
>>
>> For the fuel pressure gauge, my solution was to tap and install a VOLVO
>> OEM fuel system schraeder valve into the fuel rail. This valve allows a
>> handheld gauge to be attached easily when a pressure reading is needed,
>> and then removed during normal operation when you don't need it.
>>
>> Jon
>> 90T
>>
>>
>> ----- Original Message ----
>>
>>
>> Brian, Jeoff:
>>
>>     From ARP, torquing to 85 lb-ft produces stress which is 80-85% of
>> yield.  So that recommended torque is still in the plastic region.
>>
>>     Also, wrote about fuel pressure gauge last night.  Fatigue of the
>> bourdon tube is the only event which should cause leakage.
>>   Nonetheless,
>> next time I have the intake cam cover off, I'm going to repipe it with
>>  a
>> 1/4 turn valve, since the cam cover prevents the gauge from being
>> removed (in top of fuel rail 2/3 of the way back, bottom connected,
>> tilted slightly backwards for ease of reading.  I have a modified stock
>>
>> FPR which works fine.
>>
>>        Bernie
>>
>>
>>
>>
>>
>>
>>
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