[Supras] ARP torque; fuel pressure gauge

[berniek at technicaldevelop.com]

Jeff:

    You are probably right.  Although the glycerin filled gauges are 
built to take vibration from high pressure letdown valves and such in 
chemical plants, they are not totally immune to wear from vibration 
either. 


    Something to take care of in the spring.  I doubt if the bourdon 
tube will fail before then.


          Bernie

Jeff Mohler wrote:
> Well..I would not mount the guage hard to the engine like that.
>
> Doesnt need that vibration/harmonics torturing it.
>
> A line between rail and guage is the best way.
>
> On 10/30/07, *berniek at technicaldevelop.com 
> <mailto:berniek at technicaldevelop.com>* < berniek at technicaldevelop.com 
> <mailto:berniek at technicaldevelop.com>> wrote:
>
>     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
>
>
>