[Vwdiesel] Retorquing ARP racing studs

[mark shepherd]

In my recent rersearch,  stretch bolts yield initially at around  110 - 
115lb ft
Further stretch seemed nearer 95 -105 lbft. No point going beyond bolt's 
yield point [maybe good reasons for not ;o)...] Thus whilst carefuly 
watching for yield points  I only stretch torqued in 45 deg units rater than 
90 deg.
Digging out some early metallurgy books, I discovered releasing a  bolt and 
then restretching, actually hardens it and increases lb footage available 
[slightly]...

Mark


----- Original Message ----- 
From: "William J Toensing" <toensing at wildblue.net>
To: <vwdiesel at vwfans.com>
Sent: Friday, January 30, 2009 10:50 AM
Subject: [Vwdiesel] Retorquing ARP racing studs


>
> Good discussion as I am using them in my Quantum turbodiesel. ARP 
> recommends torque to 80 pounds if using their specialized assembly lube or 
> 120 pounds if using 30 weight oil. I am using the ARP provided lube & 
> tightened in 10 pound stages until I reached their recommended  80 pounds. 
> Am still finishing the assembly & hope to get the engine running tomorrow. 
> Seems to me on my Dasher, they recommended a retorque when warm & again 
> when cold but no such recommendations with this set of ARP studs so 
> looking forward to more comments. It is my understanding that you follow 
> the ARP recommendations, not the VW Bentley recommendations which use the 
> twist to yield bolts. When I took out the old VW head bolts, one yielded 
> at only 60 pounds & several took 120 pounds to break loose. If I recall 
> correctly, the Bentley recommends torque to 43 pounds & then a 180 degree 
> then or two 90 degree turns. Wonder what that brings the effective torque 
> to?
> Bill Toensing, Nevada City, CA
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