[Supras] ARP torque; fuel pressure gauge

[berniek at technicaldevelop.com]

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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