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SVT Shelby GT500
BMR camber bolt failure
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<blockquote data-quote="Tob" data-source="post: 12288961" data-attributes="member: 83412"><p>If you are talking about <a href="http://www.bmrsuspension.com/?page=products&productid=743" target="_blank">these</a>, then yes, they are a horrible idea. I cringe every time I see someone post them as a suggestion to use when alignment is a concern. Usually I see someone recommend them instead of using a caster/camber plate. </p><p></p><p>[ATTACH=full]380042[/ATTACH]</p><p></p><p>As Jack Hidley of Maximum Motorsports put it...</p><p></p><p></p><p></p><p>He was on to something. Some time in 2009, there were a few documented S197 chassis spindle failures. They were cracking midway through the upper ear.</p><p></p><p>[ATTACH=full]380043[/ATTACH]</p><p></p><p>[ATTACH=full]380044[/ATTACH]</p><p></p><p>Some thought it was simply the forgings failing from faulty design. It appears to have been more than that. Here's a quote from an individual that passed some information on from someone "very familiar with Mustang Challenge cars" regarding the issue...</p><p></p><p> </p><p>From <a href="http://www.corner-carvers.com/forums/showthread.php?t=41225&highlight=s197+spindle+failure" target="_blank">this </a>thread.</p><p></p><p>To address the issue, Ford introduced as a running change some time in 2009, revised strut to spindle bolts and nuts. They went from a coarse thread to one with a finer pitch. It allowed Ford to raise the clamp force or torque at this juncture. When I swapped struts a couple of years ago, I noticed I had the early bolts and changed them to the latest design.</p><p></p><p><img src="http://im1.shutterfly.com/media/47a0da03b3127ccef9b92c016ffc00000030O00AbNmbhq2aNWQPbz4Q/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://im1.shutterfly.com/media/47a0da03b3127ccef9b8efd78eaf00000030O00AbNmbhq2aNWQPbz4Q/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>New bolt on the left and my original '09 bolt on the right...</p><p></p><p><img src="http://im1.shutterfly.com/media/47a0da05b3127ccef9a47e909d8700000030O00AbNmbhq2aNWQPbz4Q/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p></p><p>I know it is going to sound odd, but here is a quote from Jeff F, a former SVT/Ford Racing engineer that addresses the quote above from fullboogie...</p><p></p><p></p><p></p><p>In summary - don't use reduced shank 'crash' bolts. They are a bad idea. Even worse when they are used on our beloved S197 chassis Mustangs due to potential spindle failures caused by insufficient clamp loads at the strut.</p></blockquote><p></p>
[QUOTE="Tob, post: 12288961, member: 83412"] If you are talking about [URL="http://www.bmrsuspension.com/?page=products&productid=743"]these[/URL], then yes, they are a horrible idea. I cringe every time I see someone post them as a suggestion to use when alignment is a concern. Usually I see someone recommend them instead of using a caster/camber plate. [ATTACH=full]380042[/ATTACH] As Jack Hidley of Maximum Motorsports put it... He was on to something. Some time in 2009, there were a few documented S197 chassis spindle failures. They were cracking midway through the upper ear. [ATTACH=full]380043[/ATTACH] [ATTACH=full]380044[/ATTACH] Some thought it was simply the forgings failing from faulty design. It appears to have been more than that. Here's a quote from an individual that passed some information on from someone "very familiar with Mustang Challenge cars" regarding the issue... From [URL="http://www.corner-carvers.com/forums/showthread.php?t=41225&highlight=s197+spindle+failure"]this [/URL]thread. To address the issue, Ford introduced as a running change some time in 2009, revised strut to spindle bolts and nuts. They went from a coarse thread to one with a finer pitch. It allowed Ford to raise the clamp force or torque at this juncture. When I swapped struts a couple of years ago, I noticed I had the early bolts and changed them to the latest design. [img]http://im1.shutterfly.com/media/47a0da03b3127ccef9b92c016ffc00000030O00AbNmbhq2aNWQPbz4Q/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/[/img] [img]http://im1.shutterfly.com/media/47a0da03b3127ccef9b8efd78eaf00000030O00AbNmbhq2aNWQPbz4Q/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/[/img] New bolt on the left and my original '09 bolt on the right... [img]http://im1.shutterfly.com/media/47a0da05b3127ccef9a47e909d8700000030O00AbNmbhq2aNWQPbz4Q/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/[/img] I know it is going to sound odd, but here is a quote from Jeff F, a former SVT/Ford Racing engineer that addresses the quote above from fullboogie... In summary - don't use reduced shank 'crash' bolts. They are a bad idea. Even worse when they are used on our beloved S197 chassis Mustangs due to potential spindle failures caused by insufficient clamp loads at the strut. [/QUOTE]
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