Marty, I was looking this up in my docs. I knew I had the info somewhere.
First off, the original length of the bolts when new isn't what they're
talking about. Those bolts are reusable AND as you found out SUPER
expensive. They are referring to the delta between the "0" torque length and
the measured length as you tighten them. There is a special tool to do this
with which I used the first few builds. What I did was document what the
torque was when I achieved that level of stretch. I have the same rods you
do. It worked out that 38 to 39 Ft lbs yielded a .007" stretch which is what
you want. The condition of this is that you use the ARP moly lube on the
threads. Do not do this with dry threads.
Hope this helps-sorry for the delay.
Russ Moore
-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of marty sukey
Sent: Wednesday, October 03, 2012 9:59 AM
To: FOT
Subject: [Fot] Carrillo Rod Bolts
Rod bolt question for you experts. I latched onto a used set of Carrillo
rods for my next spitfire engine. I figured I would get them crack tested
and size checked and be on my way. That was until I checked on the
tightening requirements. According to Carrillo you need to measure the rod
bolts when new and then re-measure them after each disassembly to make sure
they have not been overstretched. I am lacking that original length
measurement. I would just replace them all for good measure but I was
quoted a price of $56 per bolt. That being said I would prefer to use the
original bolts IF they are still good. Anybody have any alternative methods
of determining if these rod bolts have not been over stretched? The bolts
are SPS CARR S4's
Thanks,
Marty
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