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Old 06-04-2010, 10:10 PM
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ARP rod bolt torque spec with oil not moly lube?

The bolt stretch method is of course the best. But I don't have the materials.

I've ARP says to use moly lube and torque to 40ftlbs, loosen and repeat 3 times. I have ARP hardware and no ARP moly lube. Using standard motor oil does anyone know the torque specs?

.0060 is the stretch spec. PN 1076001.

Arp gives oil specs for the head bolts. My Head bolts are 80 Ft. Lbs. using the supplied Moly lube. 120 Ft. Lbs. using standard 30 weight motor oil.

So using the same percentage increase would my 40ftlb rod bolts be 60ftlbs?

Last edited by ForceFed86; 06-04-2010 at 10:21 PM.
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Old 06-04-2010, 11:27 PM
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According to a 1998 ARP catalog, the torque for a 3/8-24 170,000 fastener is 50 ft/lb w/30W oil, 39 ft.lb w/ARP moly lube. Preload is 10,512 lbs.

190,000 fastener- same size and threads- is 57 ft/lb w/30W and 44 ft/lb w/ARP moly. Preload is 11,826 lbs.

220,000 is 63 ft/lb w/30W and 49 ft/lb w/ARP moly. Preload is 13,140 lbs.

ARP recommends several loosen and tightening cycles before the final torquing of the fastener.

This is not a recommendation per se- it is to show that the difference isn't necessarily linear.

If you can't get a stretch gage, at least get the ARP moly lube.
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Old 06-05-2010, 03:12 PM
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Got some arp lube today local race shop charged 16.99 for a little packet! I feel robbed... Anyway all torqued up, thanks for the input.

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Old 06-05-2010, 07:38 PM
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Quote:
Originally Posted by ForceFed86
Got some arp lube today local race shop charged 16.99 for a little packet! I feel robbed... Anyway all torqued up, thanks for the input.

You're welcome, and I feel you on the $17 rip-off, but they have you over a barrel, to a degree. Who wants to be the guinea pig to see how well some other moly lube matches up to the ARP-spec "Super LubeŽ" lol, or in some other way risk their engine for want of a $dove's worth of goo?

Not me, but then again- I use a gage whenever possible (not all rod bolts have the proper index points for a gage)... I DO suspect a good, moly rich cam lube (not like the old stuff w/all the "grit" that used to be around) would suffice.
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