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FE-DOHC.org • View topic - Head Bolt vs. ARP Stud Analysis/Discussion

Head Bolt vs. ARP Stud Analysis/Discussion

All about the double over head cam head that we all love!

Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Sun Jul 19, 2015 6:00 am

Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

Re: Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Mon Jul 20, 2015 11:50 am

A few other ARP links for consideration:

Torque figures: http://arpinstructions.com/generaltorque.html
Assembly lube: http://arp-bolts.com/kits/ARPkit-detail.php?RecordID=89 (part number 100-9911 for the 20oz bottle)

MLS instructions by gaskets-to-go: http://gasketstogo.com/PDF%20files/MLS% ... ctions.pdf

Fred.
Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

Re: Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Mon Jul 20, 2015 8:32 pm

Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

Re: Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Tue Jul 21, 2015 11:00 am

So, latest from ARP on this is that the stud part number that monoxidechild provided was totally wrong with 1.25mm thread pitch on both ends! Utter fail.

I've filled out the spreadsheet form for stud finding and submitted it for analysis by ARP, we'll see what they come back with.

Fred.
Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

Re: Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Tue Jul 21, 2015 8:40 pm

Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

Re: Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Tue Jul 28, 2015 10:38 am

The longer stud that I mentioned above is incorrectly listed on Summit's site as being 8740 steel, when it's actually "ARP2000".

The undercut on this is 11.278mm, 0.278mm more than the Mazda bolt shank. In contrast, the part in use by quite a few FE3 owners is undercut to a very-thin 10.414mm. IE, 0.586mm less than the stock Mazda bolt shank! No wonder Alan doesn't recommend them for high cylinder pressure applications!!!

I'm going to investigate having some precision spacers made up to use the longer stronger studs and bigger more appropriate nuts/washers.

Fred.
Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

Re: Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Tue Jul 28, 2015 8:45 pm

Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

Re: Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Fri Jul 31, 2015 9:31 pm

Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

Re: Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Sun Sep 27, 2015 9:50 am

Order placed! :-D Need to hit up the head gasket man next. Then it's down to the garage to clean the bottom end out and start putting it all back together :-D
Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

Re: Head Bolt vs. ARP Stud Analysis/Discussion

Postby Fred » Mon Sep 28, 2015 7:06 am

Diary of the preparation after previous failure, and installation once the gear all arrives and I have everything ready for it! :-) viewtopic.php?f=10&t=723
Fred
 
Posts: 190
Joined: Fri Nov 26, 2010 8:19 am

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