Eagle rod W/ ARp 2000 bolts
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Eagle rod W/ ARp 2000 bolts

  1. #1
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    Default Eagle rod W/ ARp 2000 bolts

    I just bought a set of the Eagle arp 2000 bolts to upgrade my BBC rods from the 8740 bolts and noticed the thread engagement is a bit off..



    The old bolts are 1.750" under head with .700" of thread.

    The replacements according Eagle are their part # 20030 which are 1.80" under head with .600" of thread.

    I measured the rods and came up with 1.05" from the cap to the start of the thread & 1.58" from the cap to the end of the thread.

    Soo the rods have .53" of thread total. ...

    But with the "2000" bolts I only have .38" engaged as the rest of the thread on the bolt ends up past the thread in the rod..

    I called Eagle back and asked about it and the person I spoke with was familiar with this question and stated "that's how ARP made the bolt for us and we've been running them like that for years with no issues"...

    Anyone else run in to this ?

    Thanks,

    Doug
    Some call it A.D.D. I call it "multi tasking"

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    Already miss the 310/562 2manymustangs's Avatar
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    Quote Originally Posted by Boatally Insane View Post
    I just bought a set of the Eagle arp 2000 bolts to upgrade my BBC rods from the 8740 bolts and noticed the thread engagement is a bit off..



    The old bolts are 1.750" under head with .700" of thread.

    The replacements according Eagle are their part # 20030 which are 1.80" under head with .600" of thread.

    I measured the rods and came up with 1.05" from the cap to the start of the thread & 1.58" from the cap to the end of the thread.

    Soo the rods have .53" of thread total. ...

    But with the "2000" bolts I only have .38" engaged as the rest of the thread on the bolt ends up past the thread in the rod..

    I called Eagle back and asked about it and the person I spoke with was familiar with this question and stated "that's how ARP made the bolt for us and we've been running them like that for years with no issues"...

    Anyone else run in to this ?

    Thanks,

    Doug
    Gngineering 101 rule of thumb, for thread holding strength/thread engagement (steel in steel or steel in iron)... in very general terms... 1/4" diameter screw needs minimum of 1/4" thread engagement, 5/16" dia screw needs a minimum of 5/16" thread engagement, 3/8" dia screw needs a minimum of 3/8" of minimum thread engagement for max holding strength... And so on... you get the picture...

    SO anything beyond that in general terms is gravy... NOW, when you are talking about connecting rods I would want about double on a high performance application (look at the thickness of the nuts that were used in a factory OR aftermarket bolt/nut set up in comparison to what you will be sporting with the 2000 series screws and the thread engagement...

    My new Eagle rods have close to .5" thread engagement with the stock bolts...
    Pat Eason, the voice of reason...

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    steelcomp was here
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    I think I'd call ARP and get a set of washers for the bolts. I wouldn' be comfortable with what you're describing. The washers are special "close tolerance" washers.
    Last edited by scott foxwell; 03-26-2013 at 09:44 AM.
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    Quote Originally Posted by steelcomp View Post
    I think I'd call ARP and get a set of washers for the bolts. I wouldn' be comfortable with what you're describing. The washers are special "close tolerance" washers.
    Would there be any possibility of interference with head of bolt and engine block when using washers?
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    Quote Originally Posted by jrider44 View Post
    Would there be any possibility of interference with head of bolt and engine block when using washers?
    What's the application? Short answer, I'd guess that's something you'd have to check.
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    .....Talked with ARP.....

    They basically said I have to deal with Eagle as their bolts are specially made for them.....


    Called Eagle again, got a different guy this time...

    Stated that ALL of their BBC rods with the ARP 2000 bolt in them uses this same bolt which is longer than the 8740 or the L-19 ones.
    Doesn't really know if the thread engagement is the same as my set ...

    I brought up the fact that my rods may have been resized at some point in their life.. ...

    He told me of another bolt they have.. Their part number 20000.
    The head and shoulder design is identical to the 20030 that I just bought AND they are 1.600" in length (which coincides with my measurments)
    But went on to say he can't recomend using them in MY rods as their only replacement is the 20030...


    I'm ordering a set tonight....
    Doug
    Last edited by Boatally Insane; 03-26-2013 at 11:31 AM.
    Some call it A.D.D. I call it "multi tasking"

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    There was a thread about eagle/arp.....i could not locate it, but it had the dead horse beating. The thread had alot of info
    "If you can't dazzle them with brilliance...Baffle them with bullshit"

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    Quote Originally Posted by Boatally Insane View Post
    I just bought a set of the Eagle arp 2000 bolts to upgrade my BBC rods from the 8740 bolts and noticed the thread engagement is a bit off..



    The old bolts are 1.750" under head with .700" of thread.

    The replacements according Eagle are their part # 20030 which are 1.80" under head with .600" of thread.

    I measured the rods and came up with 1.05" from the cap to the start of the thread & 1.58" from the cap to the end of the thread.

    Soo the rods have .53" of thread total. ...

    But with the "2000" bolts I only have .38" engaged as the rest of the thread on the bolt ends up past the thread in the rod..

    I called Eagle back and asked about it and the person I spoke with was familiar with this question and stated "that's how ARP made the bolt for us and we've been running them like that for years with no issues"...

    Anyone else run in to this ?

    Thanks,

    Doug
    Yes, returned them for a set of L-19 rods.
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    gn7
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    I have never had a 2000 bolt protrude thru the end of the rod as far as you would have with the 1.80 bolt. Either Eagle was shipping them with the 1.60 bolt, or your rods aren't Eagles. Just because the 8740 bolt that were in the rods when you got them had Eagle stamped on them does not make them Eagle rods.
    Are you 100% double certain they are Eagle rods? The fact that you said they MAY have been resized leads me to belive you don't know the full history of the rods. BTW, resizing the rod would not effect the bolt that much. They don't remove anywhere near enough material for the parting surfaces to effect the bolt length.

    Also, be aware that torquing 2000 bolt to spec can possibly pull the big end out of shape compared to the 60-63 lbs that the 8740 bolt required.



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    Last edited by gn7; 03-26-2013 at 05:53 PM.

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    I did buy them used... They could be Chinese knock offs of Chinese knock offs I suppose...

    I've never seen a new set so really I have no idea...

    The have a center rib between the "H" and angular corners around the bolts...

    On one side it has "CRS-6565-S engraved .

    On the other side is the Eagle emblem.





    Here are some pictures with the 1.800" Eagle ARP 2000 bolts installed....










    I had already planned on getting them re-sized. Eagle says going from the 8740 to the 2000 you don't have to but I'm not taking any chances....


    Doug
    Last edited by Boatally Insane; 03-26-2013 at 07:22 PM.
    Some call it A.D.D. I call it "multi tasking"

  13. #11
    gn7
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    They are Eagles, but you dealing with idiots there.
    I'd be willing to bet that the 1.6 bolt is the standard 2000 bolt for them. Never checked, because like I said, always bought them with either 2000 or L19 bolts already in them, and never seen the bolt stick out as far as a 1.8 bolt would.
    Just a guess, but I am guessing the longer bolts are used in something like BBF or big MoPars that have a larger rod journal.
    You did the right thing by getting the shorter bolts. I don't know it you need to have them resized. But I sure would have them checked with the bolts torqued up. A good machine shop should be able to check them for roundness and straightness.



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