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1G Eagle Rod Bolt Stretch issues

Posted by willyp42, Jul 2, 2020

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  1. willyp42

    willyp42 Proven Member

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    Hey Everyone,
    i got a set or Eagle H-Beams that i am trying to install however,
    instruction say to use ARP moly lube to 43 ft-lbs for 5.5-5.9" bolt stretch.
    i am using the lube supplied (arp ultra torque) smothering the threads and face as instruction say,
    43ft lbs gets me ~4 thousands stretch,
    50 ft-lbs 4.6-4.8 thou stretch.
    my torque wrench is not known to be good so i double checked it with a different torque wrench and am getting the same results.
    is it safe to go to the 55-60 ft-lbs range to get the stretch i need or am i doing something wrong?
    i am putting rod cap into rod in vise and tapping it flush before lubing and hand tightening bolts.
    i am going a little snug on each side (maybe 5 ft-lbs) before to torquing final torque value as consistant and smooth possible.
    any words to the wise?

    thanks,
    -Will
     
  2. DSMPT

    DSMPT Proven Member

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    Are the bolt new and you using a stretch gauge? If so, you don't need to worry much about the torque number. The stretch method is the best way to do. It's all set when the stretch numbers get within the specific range. If the bolts are used, I recommend to have them replaced with new since you are not sure how much they are already stretched.
    Just in case, if you are checking the stretch number by a caliper or something not proper equipment, then better go with the torque method.
     

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  3. willyp42

    willyp42 Proven Member

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    These are brand new, my machinist torqued them down to do oil clearance.
    I bought an arp rod bolt stretch gauge just to do this. Sounds like I shouldn’t care about the torque only the stretch I am getting.
    -Will
     
    kenuwine4g63 likes this.
  4. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    Think you go by the stretch since torque wrenches can vary from wrench to wrench.
     

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  5. rabenne

    rabenne Proven Member

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    I agree, and will add that bolt stretch is a much, much better indicator of clamping load than turning torque is. The important thing here is clamping load...
     

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  6. kenuwine4g63

    kenuwine4g63 Proven Member

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    Normal. I was doing this the other day and to reach the .0058-.0063 stretch mark the rod bolts needed to be around 65lb/ft. I had three that were 70lb/ft+. The stretch is more important than the torque number. What lube did you use?
     
    kenuwine4g63

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  7. willyp42

    willyp42 Proven Member

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    Hey thanks for that update, I had to go to 67 ft lbs using arp ultra torque lube, I was really worried something was wrong.
    I had 3/8” arp 2000 looking for 5.5-5.9 thou as recommended by eagle. They said target torque was 43 ft lbs using arp moly. But ultra torque was what was supplied
     
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