Griffin@Camtech

I am not sure if this is a good idea or not. any input on re-using ARP rod bolts??

showtymers619

its good.. they dont stretch

jDMJeRk

if you buy new aftermarket rods; the Eagles at least come with them. Id do it

Muckman

iTrader: (2)

Thats the whole point of buying studs I thought, so you could reuse them.

DRAGLS

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ShowTymers619 &raquo;</TD></TR><TR><TD CLASS="quote">its good.. they dont stretch</TD></TR></TABLE>

What do mean they don't stretch? Next time you torque a set of rod bolts use a
rod bolt stretch gauge and tell me they don't stretch!!!


I would't recommend using them over unless you have a log of the free length of each bolt before torque. Thats the only way you know if they have stretched...

Muckman

iTrader: (2)

Im curious, what difference does it make if they stretch? If they have stretched a certain amount your still going to torque them down to the same amount.

99B16Si

thats where your wrong. the cap will only tighten to the rod as much as the bolt can hold before it stretches. if you over tighten them they are not getting any tighter but instead just stretching and weakening the bolt. arp gives u a torque spec because a torque wrench is a lot more common to your everyday mechanic and they tend to be pretty accurate when directions are followed and the parts used are still new or in good as new condition

DRAGLS

Here read this guys maybe you will learn something from it!

ARP highly recommend using a stretch gauge when installing rod
bolts and other fasteners where it is possible to measure the length
of the fastener. It is the most accurate way to determine the correct preload
in the rod bolt. Simply follow manufacturer’s instructions. Measure the
fastener prior to starting, and monitor overall length during installation.
When the bolt has stretched the specified amount, the correct
preload, or clamping load, has been applied. We recommend you
maintain a chart of all rod bolts, and copy down the length of the fastener
prior to and after installation. If there is a permanent increase
of .001" in length, or if there is deformation, the bolt should be
replaced.


To obtain the correct
amount of clamping
force a fastener should
actually be stretched a
measured amount. A
properly used fastener
works like a spring!

V-SPEC 1

How much stretch rod bolts usually stretch to? for instance, using Eagle rods with 5/16 bolts. I'm about to start using this stretch gauge next time I build a motor.

5thgencivic

I replaced mine when I had my motor built since the eagle rods were used. $12 a bolt though!!

dasher

Most rods manufactures instruct that you can get away with using a torque wrench if you use their specially formulated arp lubricant..... DON'T DO THIS! Every single time you torque the down the rod bolt you stretch it ... and you are going to have to torque it down once or twice to measure the clearances before finally tightening them down. I have tested this and found inaccurate readings from using a calibrated torque wrench and their lubricant.

Purchase a stretch gauge tool for 69.99(minimum) and measure each bolt individually(preloaded to .04"), 0 out the gauge, then slowly tighten down the bolt while taking periodic measurements with the stretch gauge. It usually take me 5 measurements per bolt to get the right stretch. If you decide to purchase a cheaper stretch gauge tool place a small amount of epoxy to help secure the gauge to the clamp, mine originally shifted before I fixed it.

btw ... don't reuse rod bolts!