Breaking Torsion Stops??

TaylorCox · 6/26/16, 9:29 PM

I have broken 5+ LR aluminum torsion stops this year (RR bar). I am torquing them down to 25 ft/lbs (7/8" bar). Is this too much or do I have something else going on?

copper14 · 6/26/16, 11:26 PM

a lot of sprints run steel stops on the rear

LEADERS EDGE · 6/27/16, 9:22 AM

Couple of things.....are they all the same mfg? If so....it's possible they are using 6061 material instead of something like 2024. It's also possible that they are too thin in the area where they tradition to the bolt area. If it's different brands....is it possible you are pinching them all of the way closed?

badcoupe · 6/27/16, 12:32 PM

Are they stripping the splines out or actually breaking? Do you leave a small gap between the inside of the stop and the bushing? Does the bar rotate freely in the tube and shock not be t or bound up?

TaylorCox · 6/27/16, 3:20 PM

Quote:

Originally Posted by copper14

a lot of sprints run steel stops on the rear

I've been looking for some, or even titanium, but I can't find any in my size!

TaylorCox · 6/27/16, 3:23 PM

Quote:

Originally Posted by LEADERS EDGE

Couple of things.....are they all the same mfg? If so....it's possible they are using 6061 material instead of something like 2024. It's also possible that they are too thin in the area where they tradition to the bolt area. If it's different brands....is it possible you are pinching them all of the way closed?

They have all been the same brand. I don't know what type of aluminum they are but I ordered some that are 2024. I assume those should be pretty strong?

TaylorCox · 6/27/16, 3:27 PM

Quote:

Originally Posted by badcoupe

Are they stripping the splines out or actually breaking? Do you leave a small gap between the inside of the stop and the bushing? Does the bar rotate freely in the tube and shock not be t or bound up?

They are breaking clean through. I leave 1/16" of a gap, the bar/shock travel freely.

bobby01 · 6/27/16, 7:56 PM

I would suggest you buy from a different supplier Lately a lot of arms and stops being made from 6061 than 2024 I've even seen some that are a casting. Look at the failure line to see if it's clean break or ragged if it's ragged it's more than likely a casting.
Bobby Layne

TQ29m · 6/27/16, 8:15 PM

I never torqued one down, just run them "tight" with a Craftsman 1/2 -9/16 combo box end wrench, 25 ft lb may be too much, I've watched guys come in after every time on the track and not "check" them, but tug till they move the nut, and in about a half season, they have broken yet another one, kinda like an egg sucking dog, once they start, hard to make em quit! Might just for grins and giggles, take one to your favorite machine shop, and have them ck'd, any good old machinist worth his salt can tell you in a NY minute if they are cast, 6061, or 2024. Bob

Kart65 · 6/27/16, 10:10 PM

You may have to stiff of a bar on RR

6/27/16, 8:15 PM	#9 Re: Breaking Torsion Stops??
TQ29m Senior Member Join Date: Aug 2008 Posts: 6,570	I never torqued one down, just run them "tight" with a Craftsman 1/2 -9/16 combo box end wrench, 25 ft lb may be too much, I've watched guys come in after every time on the track and not "check" them, but tug till they move the nut, and in about a half season, they have broken yet another one, kinda like an egg sucking dog, once they start, hard to make em quit! Might just for grins and giggles, take one to your favorite machine shop, and have them ck'd, any good old machinist worth his salt can tell you in a NY minute if they are cast, 6061, or 2024. Bob __________________ "Being old, isn't half as much fun, as getting there"! Ole Robert I!

6/26/16, 9:29 PM	#1 Breaking Torsion Stops??
TaylorCox Member Join Date: Sep 2015 Posts: 71	I have broken 5+ LR aluminum torsion stops this year (RR bar). I am torquing them down to 25 ft/lbs (7/8" bar). Is this too much or do I have something else going on?

6/26/16, 11:26 PM	#2 Re: Breaking Torsion Stops??
copper14 Member Join Date: Dec 2010 Posts: 124	a lot of sprints run steel stops on the rear

6/27/16, 9:22 AM	#3
LEADERS EDGE Senior Member Join Date: Jan 2008 Posts: 980	Couple of things.....are they all the same mfg? If so....it's possible they are using 6061 material instead of something like 2024. It's also possible that they are too thin in the area where they tradition to the bolt area. If it's different brands....is it possible you are pinching them all of the way closed?

6/27/16, 12:32 PM	#4
badcoupe Senior Member Join Date: Aug 2008 Posts: 1,000	Are they stripping the splines out or actually breaking? Do you leave a small gap between the inside of the stop and the bushing? Does the bar rotate freely in the tube and shock not be t or bound up?

6/27/16, 7:56 PM	#8
bobby01 Member Join Date: Nov 2011 Posts: 128	I would suggest you buy from a different supplier Lately a lot of arms and stops being made from 6061 than 2024 I've even seen some that are a casting. Look at the failure line to see if it's clean break or ragged if it's ragged it's more than likely a casting. Bobby Layne

6/27/16, 10:10 PM	#10
Kart65 Member Race Count This Year: 3 Race Count Last Year: 22 Join Date: Jan 2010 Posts: 98	You may have to stiff of a bar on RR