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Old 01-14-2016, 05:28 AM   #1
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Rear sway bar

So my Granatelli sway bars came in (35.25mm front / 24mm rear). ($125 for both new so I couldn't say no. My thinking was if they didn't work out, I don't have much invested in them so I can always swap back to factory bars. So before everyone pounces, yes, I get that a one piece sway bar is superior to anything welded from two or three. With that said you see where this is going. The front bar is one piece construction. The rear clearly was made from three pieces welded together. One of the welds is at the 90 degree bend which will take away from its strength. My question is how common are three piece welded rear sway bars?
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Old 01-14-2016, 04:50 PM   #2
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Hoping Voltwings will have some input.
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Old 01-14-2016, 09:15 PM   #3
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Thank you for the info on the welded rear sway bar. Glad I held off on these sway bars. Ive seen GT take offs in the price range you paid. Stock GT bars are very close to the size you got. I want to upgrade on my 14 vert, guess I'll keep looking.
Thanks again & good luck.
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Old 01-14-2016, 10:52 PM   #4
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As long as it was designed well, and the welds were done properly, there is no real issue.
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Old 01-15-2016, 07:43 AM   #5
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Quote:
Originally Posted by Hampton CIT View Post
Hoping Voltwings will have some input.
Lol, i've been watching but really wasn't sure so i didn't say anything.

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Originally Posted by jande063 View Post
As long as it was designed well, and the welds were done properly, there is no real issue.
I guess at this point i'll offer my thoughts, but they're nothing more than that.

IF the welds were done properly and have proper penetration, they should be stronger than the surrounding metal, so assuming cheap metal wasn't used you're probably alright. A sway bar is essentially a giant torsion spring though, and all of the load is being put pretty much on that 90* joint, so that is a big IF. I imagine in anything but all out racecar driving you will never see a problem though.
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Old 01-15-2016, 11:50 AM   #6
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Lol, i've been watching but really wasn't sure so i didn't say anything.



I guess at this point i'll offer my thoughts, but they're nothing more than that.

IF the welds were done properly and have proper penetration, they should be stronger than the surrounding metal, so assuming cheap metal wasn't used you're probably alright. A sway bar is essentially a giant torsion spring though, and all of the load is being put pretty much on that 90* joint, so that is a big IF. I imagine in anything but all out racecar driving you will never see a problem though.
What I forgot to mention earlier is the elephant in the room with a welded joint. After you perform the calculations necessary to determine the needed weld height and width (simple algebra, located in any mechanical engineering design book or manual), you also would want to perform some sort of post weld heat treatment (material dependent on which process, and how effective it will be; some materials will not accept this at all) to the bar to minimize the heat affected zone. The heat affected zone is an area where the heat from arc welding (followed by rapid cooling after the arc is terminated) causes the material to become much more brittle due to a change in the crystal structure, and internal stresses resulting from rapid cooling.

Currently, I do use a three piece bar on one of the race cars. The below picture should explain it. Anyone in the deep end of racing will have already seen something like this (very common design, strangely, none on the market for the S197). I like this bar, because it is infinitely adjustable (just make a new splined center section), and it can be adjusted in less than two minutes with the car on the ground.
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Old 01-15-2016, 03:40 PM   #7
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jande063
Just curious.
I remember the effects of cooling heated metals at different rates, from high school, but not familiar with welding. Are welds for something like this typically rapidly cooled?
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Old 01-16-2016, 06:55 PM   #8
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Thanks guys. I got some comfort from this. Pending no snow, tomorrow is driveway day for install. I'll let everyone know.
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Old 01-17-2016, 09:51 AM   #9
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Only the folks here in the forum will appreciate this. My morning project was to get the rear sway bar installed before the snow started. I ended up racing against the weather and finished just as the snow began to accumulate (not even 1/4" yet). All pleased with myself for beating the snow; streets wet and the first fluff of winter beginning to show white over the asphalt... (Yes, I'm trying to sound poetic.) Temperature dropping, raising the windshield wiper blades on the other cars in the driveway to keep them from freezing in the snow and even a touch of sleet now; cleaning up the garage before I take my car out to see how well and differently the rear handles with the new parts when the shovel of the Captain Obvious hits me in the face. There will be no cornering tests of my ride today in this weather as I realize with drooping shoulders and spirits. With my epiphany still floating over me like a bubble, my wife comes out and observes that 1) I'm all wet with sleet and snow and 2) "You're not driving that car today in this weather. grumble...
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Old 01-17-2016, 10:09 AM   #10
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^ lol! Well at least it's on!


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Old 01-17-2016, 10:44 AM   #11
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D*mn, you made it just in time. But also, don't be sending that snow up here. Push it off the coast.
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