Re: quick eagle rod torque question
[Re: skj283]
#1827957
05/16/15 06:35 PM
05/16/15 06:35 PM
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Joined: Jan 2003
Posts: 26,470 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,470
Rio Linda, CA
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From an actual Eagle instruction sheet---(have only included the two ARP 2000 specs) "ESP" Forged Steel H-Beam Connecting Rod Installation Instructions Fasteners: Rod bolt threads and underside of head of the bolt should be lubricated with ARP Moly Assembly Lube. Do not use oil or Loctite. Warning: If any other lubricant is used on the bolt, bolt stretch method must be used due to different viscosity lubricants. Improper bolt torque will cause premature bolt failure. Cap should be seated on rod by aligning cap by hand and lightly tapping into place. Alternatively tighten bolts to avoid cocking cap.
Torque Specs: -------Bolt-----------Identification----------Torque--------Bolt Stretch 7/16 ARP 2000---7/16 bolt head--------75 ft lbs-------.0064-.0068 3/8 ARP 2000----7/16 bolt head--------43 ft lbs--------.0055-.0059
The INTERNET, the MISinformation superhighway
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Re: quick eagle rod torque question
[Re: skj283]
#1828009
05/16/15 08:24 PM
05/16/15 08:24 PM
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Joined: Feb 2005
Posts: 20,272 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,272
PA.
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Be very, very careful with that SIR rod. I think I would rather run a well prepped stock rod over that piece of crap.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.38@138.67
Livin and lovin life one day at a time
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Re: quick eagle rod torque question
[Re: skj283]
#1828053
05/16/15 09:32 PM
05/16/15 09:32 PM
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Joined: Jan 2003
Posts: 1,386 Houston,Tx.
Lee446
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,386
Houston,Tx.
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This is why you should call Eagle. The torque specs given are for ARP 2000 bolts and I'm pretty sure that is not what you have.They are also for an H beam rod that threads into the rod body. ARP makes a world of rod bolts and they are made to the specs of the rod builder. A budget rod gets a budget bolt. My machine shop showed me some of these bolts that came in older Eagle rods that were having bolt failures and he said he believes the bolts were made in China, they were simply marked ARP on the 12 point head. I would wait and talk to ARP on Monday, I have found their Tech dept to be very helpful, and then talk to Eagle and see what they say. Or, you can take a chance and carry your engine home in a sack.
Last edited by Lee446; 05/16/15 09:37 PM.
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Re: quick eagle rod torque question
[Re: skj283]
#1828413
05/17/15 12:25 PM
05/17/15 12:25 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Here's Eagle's torque specs from their web site LINK.However, my experience has been that using torque #s doesn't give accurate bolt preload compared to measuring bolt stretch or using a "set to #lbs, then tighten an additional xx degrees" method (when available).
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Re: quick eagle rod torque question
[Re: skj283]
#1829739
05/19/15 12:16 AM
05/19/15 12:16 AM
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Joined: Jan 2003
Posts: 1,386 Houston,Tx.
Lee446
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,386
Houston,Tx.
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Good on ya! For example, yesterday, I was prepping my Manley H beams by putting new ARP 7/16 cap screws in that were the spec Manley wanted from ARP for their rod. Manley calls for 70 ft.lbs or .0059 to .0063 stretch, using the ARP moly assembly lube. The spec said if no ARP moly lube, use straight 30 weight and 90 FT. lbs. I chased the threads, used plenty of ARP moly, measured the bolt length and the torqued to 25,50, and 70, measuring the stretch at each increment. At 70 ft. lbs. the stretch was only 4.5 to 4.7 on every one of them! I ended up with an average of 85 ft. lbs. to get proper stretch. I would back each one down to about 60 lbs and then take it back in one smooth pull to the next 5 lb. increment. Just shows that there are no absolutes and a stretch gauge is a good investment. My Proto torque wrench was just certified by an aerospace instrument company near the airport, so I know it is accurate. I wonder how all those engines stayed together through the years that I just torqed to spec!
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