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<div dir="ltr" data-setdir="false">Henry</div><div dir="ltr" data-setdir="false">Excellent write up and documentation! I'm sure this is a help to everyone!</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">When you search general metallurgical references you will find 7075 has better fatigue strength than 6061.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">And as with a lot of race car parts, nondestructive testing of critical parts is just part of the game as suggested by Chuck Gee.</div><div dir="ltr" data-setdir="false">I have a number of red tagged parts on the "trophy" case that didn't pass inspection.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Bert Brown</div><div dir="ltr" data-setdir="false">ex Cal Club GP #90</div><div dir="ltr" data-setdir="false"><br></div><div><br></div>
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On Sunday, August 4, 2024 at 11:02:18 AM PDT, yellow04 via Fot <fot@autox.team.net> wrote:
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<div><div dir="ltr">I am throwing this out there as a public service announcement, I broke a <br></div><div dir="ltr">part that I thought we had bulletproof solution to. At PittRace last <br></div><div dir="ltr">weekend I broke one of Southwick's aluminum front hubs. The area of the <br></div><div dir="ltr">hub that the inner race presses into sheared off, thankfully the wheel <br></div><div dir="ltr">was retained by the outer bearing and stayed on the car. I don't know <br></div><div dir="ltr">for how many laps that would have been the case!<br></div><div dir="ltr"><br></div><div dir="ltr">Has anybody else heard of one of these hubs failing?<br></div><div dir="ltr"><br></div><div dir="ltr">Discussions with Richard Good, who took over manufacturing these hubs <br></div><div dir="ltr">revealed his hubs are turned from a stronger material, the GoodParts <br></div><div dir="ltr">hubs are made from 7075 T6 aluminum, while Southwick made theirs from <br></div><div dir="ltr">6061 T6. Yes, it is a little heavier, but the GoodParts hub is still <br></div><div dir="ltr">about a pound lighter than stock. If you are unsure where your hubs were <br></div><div dir="ltr">made, I provided details in the writeup.<br></div><div dir="ltr"><br></div><div dir="ltr">I have also been in contact with Chuck Gee, our resident metallurgist. <br></div><div dir="ltr">He is suggesting anybody running these Southwick hubs should start a <br></div><div dir="ltr">program of dye penetration testing.<br></div><div dir="ltr"><br></div><div dir="ltr">Pictures and writeup here.<br></div><div dir="ltr"><br></div><div dir="ltr"><a href="https://tr250racer.com/southwick-front-hub-failure/" target="_blank">https://tr250racer.com/southwick-front-hub-failure/</a><br></div><div dir="ltr"><br></div><div dir="ltr">Hope this helps everybody keep the shiny side up!<br></div><div dir="ltr"><br></div><div dir="ltr">Henry Frye<br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr"><a ymailto="mailto:fot@autox.team.net" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br></div><div dir="ltr"><br></div><div dir="ltr"><a href="http://www.fot-racing.com" target="_blank">http://www.fot-racing.com</a><br></div><div dir="ltr"><br></div><div dir="ltr">Donate: <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br></div><div dir="ltr">Archive: <a href="http://autox.team.net/archive" target="_blank">http://autox.team.net/archive</a> <a href="http://www.team.net/pipermail/fot" target="_blank">http://www.team.net/pipermail/fot</a><br></div><div dir="ltr">Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/moosehd2@pacbell.net" target="_blank">http://autox.team.net/mailman/options/fot/moosehd2@pacbell.net</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div></div>
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