I killed a sway-bar, Pics |
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I killed a sway-bar, Pics |
Jetsetsurfshop |
Sep 1 2021, 07:22 PM
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#1
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
I thought I'd share these pics. I never believed that a sway-bar would break. Anyone else seen this before?
Attached thumbnail(s) |
infraredcalvin |
Sep 1 2021, 11:34 PM
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#2
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Distracted Member Group: Members Posts: 1,510 Joined: 25-August 08 From: Ladera Ranch, CA Member No.: 9,463 Region Association: Southern California |
Wow, a tarrett as well!
Sent it to them see what they’ll do for you. I know they’ll sell you a bar only, you may want to up the size though… |
Shivers |
Sep 2 2021, 05:22 AM
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#3
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Senior Member Group: Members Posts: 2,364 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
Wow, that is some hard charging
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Jetsetsurfshop |
Sep 2 2021, 07:23 AM
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#4
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
Wow, a tarrett as well! Sent it to them see what they’ll do for you. I know they’ll sell you a bar only, you may want to up the size though… Good info. I didn't know they would just send a bar. I'll have to hit them up. Still have to measure it but I think its their bigger one. I'm not really upset about it. It's been used hard at Sebring for 12 years. Still never expected a sway-bar to fail. |
Jetsetsurfshop |
Sep 2 2021, 07:24 AM
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#5
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
Wow, that is some hard charging I think the four-offs has taking their toll too. (IMG:style_emoticons/default/driving.gif) |
Jetsetsurfshop |
Sep 2 2021, 07:29 AM
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#6
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
More pics. (IMG:style_emoticons/default/biggrin.gif)
Attached image(s) |
jd74914 |
Sep 2 2021, 09:50 AM
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#7
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
Curious what the bar ends that are in the arm look like.
I would expect it to break there given that is the reaction location for the bending load. Once you add the combined torsional load on you can really jack up the stresses in a Mohr's circle. You must have reached it's high cycle fatigue limit-wow. |
stownsen914 |
Sep 2 2021, 09:53 AM
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#8
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
That's impressive.
Sometimes it's hard to tell after the fact, but is there any obvious sign of damage that might have led to the fracture. Sometimes if you clean it up well and look closely at the failed part, you can tell where the crack started and look for a stress riser like scoring on the surface or some other damage. Another thing I've noticed - I've set up a 911 and 914 with the through body front swaybar, and both of them had significant binding at triangular bushing mounts. Basically the vertical surfaces that the mount bolt to weren't parallel, so when mounted the bar really bound up to the point that I couldn't move it by hand at all. I had to put washers under two of the three triangular bushing mounts, on both sides of the car, to get them parallel. |
Jetsetsurfshop |
Sep 2 2021, 10:59 AM
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#9
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
That's impressive. Sometimes it's hard to tell after the fact, but is there any obvious sign of damage that might have led to the fracture. Sometimes if you clean it up well and look closely at the failed part, you can tell where the crack started and look for a stress riser like scoring on the surface or some other damage. Another thing I've noticed - I've set up a 911 and 914 with the through body front swaybar, and both of them had significant binding at triangular bushing mounts. Basically the vertical surfaces that the mount bolt to weren't parallel, so when mounted the bar really bound up to the point that I couldn't move it by hand at all. I had to put washers under two of the three triangular bushing mounts, on both sides of the car, to get them parallel. We had to washer up mine to get it to move smoothly. When I removed what was left of the bar it moved great. No binding what so ever. I did find a video from a recent event where a dropped the passenger front wheel in turn one at Sebring. It was a pretty hard thud. Maybe I cracked it then?? The funny part if that I had a spin the next lap. I remember thinking that I wasn't really offline and the spin shouldn't have happened. I'll work on the video tonight. Maybe we have a smoking gun. |
stownsen914 |
Sep 2 2021, 11:50 AM
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#10
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
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914werke |
Sep 2 2021, 12:19 PM
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#11
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"I got blisters on me fingers" Group: Members Posts: 10,030 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest |
Is it a hollow bar ?
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Jetsetsurfshop |
Sep 2 2021, 02:38 PM
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#12
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
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sixnotfour |
Sep 2 2021, 08:10 PM
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#13
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914 Wizard Group: Members Posts: 10,418 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains |
hollow hybred..or lessbred..True hollows are through hollow...I am sure you will get free replacement..lesser design..
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stownsen914 |
Sep 4 2021, 06:10 AM
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#14
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
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Jetsetsurfshop |
Sep 4 2021, 09:53 AM
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#15
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
https://www.youtube.com/watch?v=a9Meh2OBiBY You can see the wheel drop out of turn one at the 8:40 mark. There is also a great spin at the 22:25 mark. I was P2 at this point. Before the race was done the Z-car broke. I could have finished P1!!!! (IMG:style_emoticons/default/hissyfit.gif) |
Jetsetsurfshop |
Sep 4 2021, 03:59 PM
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#16
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
Is the square end welded to the hollow bar?
[/quote] Attached image(s) |
stownsen914 |
Sep 5 2021, 06:08 AM
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#17
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
I'd guess it failed at the weld (or right next to it).
Tarrett might be in pictures of the failure. |
ChrisFoley |
Sep 5 2021, 08:23 AM
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#18
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I am Tangerine Racing Group: Members Posts: 7,919 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
Obviously it had years of service at the mid to upper range of it's load capacity. Not much wonder it finally failed. Multiple potential failure points. I never did like that design. Splined hollow bars are the way to go.
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Jetsetsurfshop |
Sep 6 2021, 10:59 AM
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#19
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
Obviously it had years of service at the mid to upper range of it's load capacity. Not much wonder it finally failed. Multiple potential failure points. I never did like that design. Splined hollow bars are the way to go. Hey Chris, What does the splined bars look like? Shane |
stownsen914 |
Sep 6 2021, 12:25 PM
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#20
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
I put a Speedway Engineering bar on the front of my 914. They come in various diameters, wall thicknesses, and lengths to fit just about any car. I've been very happy with it. Not exactly a bolt on though.
http://1speedway.com/index.php?route=produ...ory&path=76 |
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