I over-streched a couple of these once by using ARP lube, which is much slicker
than the lube Carillo recommends. Make sure you use the right stuff - I think
it's a moly Loctite product, which I found at Pep Boys, though Carrillo now
sells their own brand. My experience is that if they have been over-stretched,
when you tighten them to the correct torque they will stretch more than
indicated, or conversely if you tighten to the correct stretch it won't take
enough torque. They are dinky little bolts and the required torque is quite
low. So, if you tighten to 215 inch-pounds and they stretch as indicated, they
should still be good.
Ridiculously expensive, too! I wonder if you couldn't replace them with an ARP
product for less?
On Oct 3, 2012, at 9:58 AM, marty sukey wrote:
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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