furryeggs
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| posted on 24/4/16 at 07:56 AM |
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ARP bolts, 36ft lbs, Really!
My ARP rod bolts turned up yesterday for my blacktop. reading the fitting instruction from ARP it says torque to 36 ft lbs??? that doesnt seem very
much.
is this correct?
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snapper
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| posted on 24/4/16 at 08:14 AM |
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Is that wildly different from stock?
My Pinto says 35ftlb so I would say 36 sounds ok
ARP have 2 ratings 1 with ARP lube 2nd with oil
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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big-vee-twin
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| posted on 24/4/16 at 08:58 AM |
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Yep mine are in at that, the bolts are also supposed to stretch using a special tool.
I was advised to tighten and loosen them 3 times to get the stretch.
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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furryeggs
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| posted on 26/4/16 at 12:45 PM |
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My torque wrench is in Nm so by my calculations thats 48.8Nm.
36ft lb x 1.3558=48.80 Nm
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DJT
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| posted on 26/4/16 at 12:49 PM |
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Are they the rod bolts? If so, don't forget to countersink the bearing caps.
http://tigeravonbuilddiary.blogspot.com/
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furryeggs
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| posted on 28/4/16 at 06:32 AM |
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Now i'm confused, ARPs website states that for a 2.0 zetec torque the bolts to 36ft lbs, opening the bolt packet with the grease theres a
fitting guide that says torque to 25ft lbs???
which is it
the bolt i have do state they can be used on 1.6, 1.8 & 2.0 Zetec.
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DJT
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| posted on 28/4/16 at 06:50 AM |
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IIRC our UK 1.8 and 2.0 are listed under 1.6 on US website. The 2.0 listed is for ST170 variant or something.
http://tigeravonbuilddiary.blogspot.com/
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snapper
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| posted on 28/4/16 at 08:35 AM |
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Torque is produced by the friction on the threads as you squeeze the caps together
The ARP lube is a molybdenum thin grease so for the same bolt stretch you see less torque
I didn't think ARP were stretch type bolts in the true sense but we all know bolts will stretch to some extent jnder load
IMHO
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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DJT
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| posted on 28/4/16 at 08:47 AM |
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Pretty sure they are stretch bolts as the instructions recommend measuring the stretch:
[4] ARP recommends using the STRETCH METHOD when tightening rod bolts. Following the instructions for using a stretch gauge, Stretch the bolts to .
0050 - . 0055 .
Problem I had was that there is always some residual oil in the con rod threads, so the ARP lube is diluted somewhat. Would not be an issue on a
'clean' engine re-build. I just used the lube and torqued to 25 ft-lbs. Been okay so far.
http://tigeravonbuilddiary.blogspot.com/
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furryeggs
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| posted on 28/4/16 at 07:57 PM |
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Thats it, done and fitted.
countersunk, arp lubed, torqued & loosened 3x to 25ft lbs (33.8Nm).
simple.
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