Torque specs w/ARP main/rod/head hardware? And clearances?
#1
Senior Member
Thread Starter
iTrader: (3)
Join Date: May 2008
Location: Fargo, ND
Posts: 533
Total Cats: 3
Torque specs w/ARP main/rod/head hardware? And clearances?
Hey guys,
Going through and checking tolerances and I have a few questions. I am trying to find if anyone has an angle measure on ARP TTY (torque to yeild) rod bolts, first off. The tool I've always used for tty bolts is a torque wrench with an angle reading on it so that you run it xx angle past the tq spec and it gives you the proper stretch.
I'm using the following specs on my arp stuff:
Head studs : 50ft/lbs
Rod Bolts : 65ft/lbs
Main studs: 43ft/lbs
So I went with this on the rod bolts based on Sav's post, head studs also based on other peoples experiences with possibly ruining the head with too high tq, and Main stud tq is from the book. Does this sound right or is my Main stud level too low?
My bearing clearances are about .0018 (between .0015 and .0020 on plastigauge.) on my rods and .0020 on my Main bearings based on the tq numbers I used. These are a bit high, I'm sorta wondering If I should go to different bearings or stick with STD bearings that I'm using.
That's about all I have for questions. Only other thing I've messed with is re-tapping the crank pulley for no8 instead of 6 bolts. This motor actually sheared those bolts due to over-torque. Not my hand on that one.
Anyway, just some opinions would be helpful..
Going through and checking tolerances and I have a few questions. I am trying to find if anyone has an angle measure on ARP TTY (torque to yeild) rod bolts, first off. The tool I've always used for tty bolts is a torque wrench with an angle reading on it so that you run it xx angle past the tq spec and it gives you the proper stretch.
I'm using the following specs on my arp stuff:
Head studs : 50ft/lbs
Rod Bolts : 65ft/lbs
Main studs: 43ft/lbs
So I went with this on the rod bolts based on Sav's post, head studs also based on other peoples experiences with possibly ruining the head with too high tq, and Main stud tq is from the book. Does this sound right or is my Main stud level too low?
My bearing clearances are about .0018 (between .0015 and .0020 on plastigauge.) on my rods and .0020 on my Main bearings based on the tq numbers I used. These are a bit high, I'm sorta wondering If I should go to different bearings or stick with STD bearings that I'm using.
That's about all I have for questions. Only other thing I've messed with is re-tapping the crank pulley for no8 instead of 6 bolts. This motor actually sheared those bolts due to over-torque. Not my hand on that one.
Anyway, just some opinions would be helpful..
#4
Former Vendor
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,099
43 sounds low for the mains, IIRC the instructions say 60 or 65. We torque the heads to 65.
For the rod bolts, what you want to do is start at 43ft.lbs or whatever, then torque through a certain number of degrees, then check the stretch. Note the stretch, then fully loosen, check stretch again to ensure that the bolt didn't yield, then torque to 43ft.lbs + a few more degrees. Repeat until you get the correct stretch number.
For the rod bolts, what you want to do is start at 43ft.lbs or whatever, then torque through a certain number of degrees, then check the stretch. Note the stretch, then fully loosen, check stretch again to ensure that the bolt didn't yield, then torque to 43ft.lbs + a few more degrees. Repeat until you get the correct stretch number.
#5
Senior Member
Thread Starter
iTrader: (3)
Join Date: May 2008
Location: Fargo, ND
Posts: 533
Total Cats: 3
43 sounds low for the mains, IIRC the instructions say 60 or 65. We torque the heads to 65.
For the rod bolts, what you want to do is start at 43ft.lbs or whatever, then torque through a certain number of degrees, then check the stretch. Note the stretch, then fully loosen, check stretch again to ensure that the bolt didn't yield, then torque to 43ft.lbs + a few more degrees. Repeat until you get the correct stretch number.
For the rod bolts, what you want to do is start at 43ft.lbs or whatever, then torque through a certain number of degrees, then check the stretch. Note the stretch, then fully loosen, check stretch again to ensure that the bolt didn't yield, then torque to 43ft.lbs + a few more degrees. Repeat until you get the correct stretch number.
#6
Former Vendor
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,099
My bearing clearances are about .0018 (between .0015 and .0020 on plastigauge.) on my rods and .0020 on my Main bearings based on the tq numbers I used. These are a bit high, I'm sorta wondering If I should go to different bearings or stick with STD bearings that I'm using.
That's about all I have for questions. Only other thing I've messed with is re-tapping the crank pulley for no8 instead of 6 bolts. This motor actually sheared those bolts due to over-torque. Not my hand on that one.
#7
Senior Member
Thread Starter
iTrader: (3)
Join Date: May 2008
Location: Fargo, ND
Posts: 533
Total Cats: 3
I'll be careful with those bolts. I have the right sized torque wrenches for any fastener on this motor, thankfully. Most of my tools are more Diesel semi tractor sized, but most of it carries over to my car.
Thanks for the tips, and I did find the spec is 60ftlbs on the mains, so that's what I'm going to use.
Thanks for the tips, and I did find the spec is 60ftlbs on the mains, so that's what I'm going to use.
Thread
Thread Starter
Forum
Replies
Last Post