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Why I never had much confidence in Kenny Brown parts
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<blockquote data-quote="Billy Madrid" data-source="post: 3283119" data-attributes="member: 37978"><p>I don't have any shots of the arms as they failed over 3 years ago and were replaced with new ones. I distinctly remember that the crack started at the end of the existing KB gusset and wrapped itself around the tube from the top through to the bottom on both sides. The one that broke, you could see some working cracks in the plating that existed before the main crack fatigued through.</p><p></p><p>The rear back upper arm tube broke first. There were no witness marks on the arm to show any physical contact with the frame. I honestly can't say if the frame was notched or not.</p><p></p><p>One thing I have noticed is that the arms we received were plated and the ones in the pictures above look like hammer tone paint. Our plated arms after cracking, leaked out some of the plating liquids that had been trapped in the arm by welding. I am no engineer, but I have worked in the auto industry in product developent and I was concerned about the 2 things with the arms:</p><p></p><p>1) the gusset ending right at the bending point of the tube, setting up a major fatigue point right where it shouldn't be</p><p></p><p>2) plating the arms. Plating causes some embrittlement of the metal surface offering a less than optimum situation that could foster cracking and a fatigue break</p><p></p><p>I think that if it had happened only in one arm then I could accept a 1 off, however all 6 arms have basically suffered the same failure mode in different areas at different times. Could it be the plating, not big enough tubes or basic gusset design. I am not sure as I know many people who have successfully used KB products for years with no issues. Maybe we were unlucky.</p><p></p><p>Again I am not trying to cause any issues as we might have been exceeding the design loads the arms were made to operate under. We were using Dunlop slicks and running the car very hard and the first arm that broke was the outside rear upper arm. We had however been advised that they would work in this application. I am certain that some of you might be approaching the design limits of the arms as well and just wanted to have you guys pay close attention to them.</p><p></p><p>I am very privileged to be able to have spent a number of hours of seat time in one of these cars, albeit heavily modified, and just don't want to see one damaged when it doesn't need to occur. :burnout:</p><p></p><p>Oh, by the way my real name is Eric Nummelin. Billy Madrid is justmy cooool name. :rollseyes</p></blockquote><p></p>
[QUOTE="Billy Madrid, post: 3283119, member: 37978"] I don't have any shots of the arms as they failed over 3 years ago and were replaced with new ones. I distinctly remember that the crack started at the end of the existing KB gusset and wrapped itself around the tube from the top through to the bottom on both sides. The one that broke, you could see some working cracks in the plating that existed before the main crack fatigued through. The rear back upper arm tube broke first. There were no witness marks on the arm to show any physical contact with the frame. I honestly can't say if the frame was notched or not. One thing I have noticed is that the arms we received were plated and the ones in the pictures above look like hammer tone paint. Our plated arms after cracking, leaked out some of the plating liquids that had been trapped in the arm by welding. I am no engineer, but I have worked in the auto industry in product developent and I was concerned about the 2 things with the arms: 1) the gusset ending right at the bending point of the tube, setting up a major fatigue point right where it shouldn't be 2) plating the arms. Plating causes some embrittlement of the metal surface offering a less than optimum situation that could foster cracking and a fatigue break I think that if it had happened only in one arm then I could accept a 1 off, however all 6 arms have basically suffered the same failure mode in different areas at different times. Could it be the plating, not big enough tubes or basic gusset design. I am not sure as I know many people who have successfully used KB products for years with no issues. Maybe we were unlucky. Again I am not trying to cause any issues as we might have been exceeding the design loads the arms were made to operate under. We were using Dunlop slicks and running the car very hard and the first arm that broke was the outside rear upper arm. We had however been advised that they would work in this application. I am certain that some of you might be approaching the design limits of the arms as well and just wanted to have you guys pay close attention to them. I am very privileged to be able to have spent a number of hours of seat time in one of these cars, albeit heavily modified, and just don't want to see one damaged when it doesn't need to occur. :burnout: Oh, by the way my real name is Eric Nummelin. Billy Madrid is justmy cooool name. :rollseyes [/QUOTE]
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