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Old 04-01-2015, 06:23 PM   #1
uglybetty
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Default rehone for upgrading studs mid build?

Ok....so I have my shortblock together and it was torque plate honed with regular arp 2000 head studs. I ended up with a larger turbo and am considering upgrading to Arp 625s. If I do decide to upgrade to the 625s will I need to rehone everything and start over? Reason I'm asking is because the torque value is different and I was wondering if it will make a difference in the ptw clearances by going from one to the other.
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Old 04-01-2015, 11:48 PM   #2
uglybetty
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Anyone?
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Old 04-06-2015, 11:23 PM   #3
BeastianSTI
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Yes, you will. The torque spec of the larger head bolt nuts (that normally fasten the head) can/will alter amount of distortion that the cylinder wall experiences. The cylinder walls could end up out of round in some way if you don't hone it out.
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Old 04-06-2015, 11:37 PM   #4
pyrosyrus
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Quote:
Originally Posted by BeastianSTI View Post
Yes, you will. The torque spec of the larger head bolt nuts (that normally fasten the head) can/will alter amount of distortion that the cylinder wall experiences. The cylinder walls could end up out of round in some way if you don't hone it out.
Have you ever checked out of roundness on an ej? Pretty sure that going from 90 ft/lbs tq of the arp2000 to the 100 ft/lbs tq of the +625 won't make that much difference.
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Old 04-07-2015, 10:21 AM   #5
uglybetty
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Just realized that I'm a complete moron for even posting this question as my block is sleeved and it shouldn't make a huge difference with sleeves in the block. I'm going with the 625s as I don't want any head lift at higher boost. The 625s should allow me to 32 psi ish on e85. That will be mid 600s. Thanks for chiming in fellas.
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Old 04-07-2015, 04:45 PM   #6
BeastianSTI
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Originally Posted by pyrosyrus View Post
Have you ever checked out of roundness on an ej? Pretty sure that going from 90 ft/lbs tq of the arp2000 to the 100 ft/lbs tq of the +625 won't make that much difference.
Yes, I have. Everyone that builds an engine should be doing so....

I wouldn't leave it up to being pretty sure, but that's just me. The case halves should also be bolted together when measuring for OOR. All distortions of the block should be in effect while measuring. Some people go as far as ensuring that the temperature of the room is within a certain range before measuring, due to the metallurgy of the block.
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Old 04-07-2015, 04:46 PM   #7
BeastianSTI
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Quote:
Originally Posted by uglybetty View Post
Just realized that I'm a complete moron for even posting this question as my block is sleeved and it shouldn't make a huge difference with sleeves in the block. I'm going with the 625s as I don't want any head lift at higher boost. The 625s should allow me to 32 psi ish on e85. That will be mid 600s. Thanks for chiming in fellas.

Dang - go you! Sounds pretty sick.
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Old 04-07-2015, 06:58 PM   #8
uglybetty
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My case halves were bolted together and the mains were line bored to spec. I also provided the entire rotating assembly to the machinist for measuring every detail and balancing the rotating assembly for me. Going with a BW s362 fmw on e85 in my fxt. Should be stupid.
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Old 04-07-2015, 07:15 PM   #9
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