Re: Main studs question
[Re: AndyF]
#3182196
10/08/23 02:33 PM
10/08/23 02:33 PM
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jcc
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If you can't dazzle em with diamonds..
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I know that is the common norm, but why exactly? Is it just to clean out the trapped crap, or to gain more thread engagement by cutting deeper threads?
I think I can make a case if the stud is already screwed into its last thread, cutting more threads in a taper tapped existing hole with a bottoming tap will only weaken the block.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Main studs question
[Re: AndyF]
#3182260
10/08/23 05:59 PM
10/08/23 05:59 PM
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Posts: 1,121 State, country, etc.
gss
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For a performance build all blind holes in the block should be bottom tapped and then cleaned. Especially any threaded hole used for studs. Buy a set of bottom taps and use them. You'll be amazed how much crud is trapped in those threads, even after hot tanking. The holes are clean. I looked with an endoscope. So you are saying cut more threads and run the studs down to the shank?
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Re: Main studs question
[Re: jcc]
#3182261
10/08/23 06:01 PM
10/08/23 06:01 PM
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gss
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I think I can make a case if the stud is already screwed into its last thread, cutting more threads in a taper tapped existing hole with a bottoming tap will only weaken the block. If the stud was screwed into it's last thread, why would you cut more threads into the block?
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Re: Main studs question
[Re: jcc]
#3182269
10/08/23 06:43 PM
10/08/23 06:43 PM
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Joined: Jan 2003
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AndyF
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I Win
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I know that is the common norm, but why exactly? Is it just to clean out the trapped crap, or to gain more thread engagement by cutting deeper threads?
I think I can make a case if the stud is already screwed into its last thread, cutting more threads in a taper tapped existing hole with a bottoming tap will only weaken the block. I've never seen a set of ARP main studs, or head studs, screw in all the way without bottom tapping all of the holes. My guess is that ARP designed their studs for fully threaded holes but I don't know for sure. In any case, Mopar blocks need to be bottom tapped if a person is going to use ARP studs.
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Re: Main studs question
[Re: AndyF]
#3182285
10/08/23 08:12 PM
10/08/23 08:12 PM
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Joined: Dec 2005
Posts: 11,704 Fulton County, PA
CMcAllister
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I'd rather have it engaged all the way into the threads than stopped against the top edge of the hole. A couple threads (1-2) showing out of the hole is normal on all my main and head ARP stuff.
If the results don't match the theory, change the theory.
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Re: Main studs question
[Re: gss]
#3182333
10/09/23 12:22 AM
10/09/23 12:22 AM
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jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
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Bitopia
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I think I can make a case if the stud is already screwed into its last thread, cutting more threads in a taper tapped existing hole with a bottoming tap will only weaken the block. If the stud was screwed into it's last thread, why would you cut more threads into the block? That was my question.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Main studs question
[Re: gss]
#3182484
10/09/23 02:56 PM
10/09/23 02:56 PM
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AndyF
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I noticed that some of the studs rub on the inside of the main bearing cap making it difficult to remove the stud by hand when the bearing cap is seated. I would think this would move things in ways they were not intended to move. Does anyone ever open up the holes in the caps for clearance so the only force exerted on the cap is the clamping force? Yes, the main caps often need to be reamed out slightly when installing studs. I have a bunch of metric and standard reamers so I can provide clearance while removing the minimum material.
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Re: Main studs question
[Re: FastmOp]
#3182525
10/09/23 04:38 PM
10/09/23 04:38 PM
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jcc
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If you can't dazzle em with diamonds..
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Explain, because it seems to me very little force is ever transferred to the end of the stud, in tension.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Main studs question
[Re: FastmOp]
#3182546
10/09/23 06:35 PM
10/09/23 06:35 PM
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gss
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If you screw a stud into a tapered tapped hole your creating a stress riser at the point the stud wedges it's self into the taper. This is bad. Isn't the idea to stop screwing in the stud before you get to the taper in the hole?
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Re: Main studs question
[Re: FastmOp]
#3182579
10/09/23 07:59 PM
10/09/23 07:59 PM
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Joined: Dec 2003
Posts: 22,727 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
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How many main studs you ever torqued?
They move when you apply load. Jamming into the taper is a wedge. So, we now circle back to our starting point, one only needs enough threads to top out on the stud's threads and jam(?) the stud, because the studs move under load, and what happens in the female threads beyond the bottom of the stud is of little concern and does not automatically require a bottoming tap. Have I got this right?
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Main studs question
[Re: jcc]
#3182639
10/10/23 01:06 AM
10/10/23 01:06 AM
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Joined: Jan 2003
Posts: 5,763 Hot Rod Ridge
FastmOp
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I know that is the common norm, but why exactly? Is it just to clean out the trapped crap, or to gain more thread engagement by cutting deeper threads?
I think I can make a case if the stud is already screwed into its last thread, cutting more threads in a taper tapped existing hole with a bottoming tap will only weaken the block. Why exactly, is because you want the threads in the hole deeper then the threads on the stud. Period! The case you are arguing is what exactly? I tryd to explain to you the stress riser at the bottom is a wedge weekining the cast iron hole if the stud is not fully engaged. It's better to have room in the bottom of the hole for a few reasons, the stress riser being the main reason, but also because if the stud bottoms out they can be a PITA to remove, sometimes needing to be EDM'd out . It's a lot better for the studs threads to bottom on the very 1st thread then to wedge itself into the bottom of the hole. The stud is a far superior alloy so the stress at the very 1st thread is not a problem. I still want to know if you have ever installed a set of main studs? I tryd to answer your question, will you answer mine ?
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