Thread: Thread depth/holding power
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12-13-2006 12:23 PM #1
Thread depth/holding power
Poly locks on the rockers......are 5 1/2 turns enuff to hold them down?
Stock studs and roller rockers ,460 ish lift and mild springs.
There soo long ,it just seems like 20 turns would hold better,...but the studs would need to be real long.I guess the extra length on the locks are so you can install a girdle ?Last edited by shawnlee28; 12-13-2006 at 12:27 PM.
Its gunna take longer than u thought and its gunna cost more too(plan ahead!)
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12-13-2006 12:27 PM #2
If the stud dosen't come through the top of the nut it won't hold.Charlie
Lovin' what I do and doing what I love
Some guys can fix broken NO ONE can fix STUPID
W8AMR
http://fishertrains94.webs.com/
Christian in training
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12-13-2006 12:47 PM #3
Thats for the factory nuts,I have poly locks with the little allen head locker that goes down the center of the nut/poly lock.Its gunna take longer than u thought and its gunna cost more too(plan ahead!)
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12-13-2006 12:54 PM #4
OK those are what I use. You should have atleast the dia. of the stud inside the nut.Charlie
Lovin' what I do and doing what I love
Some guys can fix broken NO ONE can fix STUPID
W8AMR
http://fishertrains94.webs.com/
Christian in training
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12-14-2006 03:54 AM #5
It's a threads-per inch thing, 5 turns on 10 per inch,great,5 turns on 20 per inch,probably pull threads off. Hank
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12-14-2006 04:41 AM #6
The generally accepted engineering theory is that the minimum thread engagement should be at least 1 1/2 times the threaded fastener diameter.Old guy hot rodder
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12-14-2006 07:33 AM #7
The 1-1/2 rule is particularly valid when using bolts up to their full clamping potential. You always want the bolt to fail in tension rather than risk pulling out the female threads. Usually 1 diameter engagement will insure this with a big safety factor.
Rockers are not stressing the studs to that degree (90% proof load) so you could definitely get by with a lot less than 1 1/2 engagement.
For 1/2 - 20 UNF studs 5 turns is 1/4 inch engagement. That represents 50% engagement which should be adequate IMO. After all, the clamp load for a 1/2-20 UNF G8 bolt is 13,000 Lbf.
KitzJon Kitzmiller, MSME, PhD EE, 32 Ford Hiboy Roadster, Cornhusker frame, Heidts IFS/IRS, 3.50 Posi, Lone Star body, Lone Star/Kitz internal frame, ZZ502/550, TH400
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12-14-2006 10:42 AM #8
I hope they work!!!!!!
Whats the worst case......it pops off and I shut it down or....it blowes a head gaskett?Its gunna take longer than u thought and its gunna cost more too(plan ahead!)
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12-14-2006 12:25 PM #9
When it gets right down to it You have no choice you have to adjust them to the proper setting where ever that is. The only way to change that would be longer studs. Then even higher rocker covers. Then your locks wouldn't be able to lock. I think werre chasing our tails here.Charlie
Lovin' what I do and doing what I love
Some guys can fix broken NO ONE can fix STUPID
W8AMR
http://fishertrains94.webs.com/
Christian in training
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12-14-2006 12:43 PM #10
what engine is this for? are you sure you have the right length studs, a friend of mine had a set that were too short and sheared off a stud.
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12-14-2006 12:44 PM #11
Shawn you are an optimist!
The worst thing that can happen of course is death. Say you're up at 100 mph and it pops off, goes through the valve cover causing a fire and you lose control and hit a tree.
OK, probably not .......Jon Kitzmiller, MSME, PhD EE, 32 Ford Hiboy Roadster, Cornhusker frame, Heidts IFS/IRS, 3.50 Posi, Lone Star body, Lone Star/Kitz internal frame, ZZ502/550, TH400
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12-14-2006 01:27 PM #12
if you get them down to 1/2-7/16 on the threaded stud thats good .more you may be better not for any thing than it may center up the rocker fulcrum lower on the stud and get part of the rocker off the threaded part of the stud have used longer studs all the time arp sell them in all dimension
Welcome to CHR. I think that you need to hook up your vacuum advance. At part throttle when cruising you have less air and fuel in each cylinder, and the air-fuel mixture is not as densely packed...
MSD 8360 distributor vacuum advance