--===============0253063241490535768==
boundary="----=_Part_1824808_2093619358.1722805133945"
------=_Part_1824808_2093619358.1722805133945
Content-Transfer-Encoding: quoted-printable
HenryExcellent write up and documentation!=C2=A0 I'm sure this is a help t=
o everyone!
When you search general metallurgical references you will find 7075 has bet=
ter fatigue strength than 6061.
And as with a lot of race car parts, nondestructive testing of critical par=
ts is just part of the game as suggested by Chuck Gee.I have a number of re=
d tagged parts on the "trophy" case that didn't pass inspection.
Bert Brownex Cal Club GP #90
On Sunday, August 4, 2024 at 11:02:18 AM PDT, yellow04 via Fot <fot@aut=
ox.team.net> wrote: =20
=20
I am throwing this out there as a public service announcement, I broke a=
=20
part that I thought we had bulletproof solution to. At PittRace last=20
weekend I broke one of Southwick's aluminum front hubs. The area of the=20
hub that the inner race presses into sheared off, thankfully the wheel=20
was retained by the outer bearing and stayed on the car. I don't know=20
for how many laps that would have been the case!
Has anybody else heard of one of these hubs failing?
Discussions with Richard Good, who took over manufacturing these hubs=20
revealed his hubs are turned from a stronger material, the GoodParts=20
hubs are made from 7075 T6 aluminum, while Southwick made theirs from=20
6061 T6. Yes, it is a little heavier, but the GoodParts hub is still=20
about a pound lighter than stock. If you are unsure where your hubs were=20
made, I provided details in the writeup.
I have also been in contact with Chuck Gee, our resident metallurgist.=20
He is suggesting anybody running these Southwick hubs should start a=20
program of dye penetration testing.
Pictures and writeup here.
https://tr250racer.com/southwick-front-hub-failure/
Hope this helps everybody keep the shiny side up!
Henry Frye
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
ell.net
=20
------=_Part_1824808_2093619358.1722805133945
Content-Transfer-Encoding: quoted-printable
<html><head></head><body><div class=3D"ydp42679b62yahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">Henry</div><div dir=3D"ltr" =
data-setdir=3D"false">Excellent write up and documentation! I'm sure =
this is a help to everyone!</div><div dir=3D"ltr" data-setdir=3D"false"><br=
></div><div dir=3D"ltr" data-setdir=3D"false">When you search general metal=
lurgical references you will find 7075 has better fatigue strength than 606=
1.</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" d=
ata-setdir=3D"false">And as with a lot of race car parts, nondestructive te=
sting of critical parts is just part of the game as suggested by Chuck Gee.=
</div><div dir=3D"ltr" data-setdir=3D"false">I have a number of red tagged =
parts on the "trophy" case that didn't pass inspection.</div><div dir=3D"lt=
r" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">B=
ert Brown</div><div dir=3D"ltr" data-setdir=3D"false">ex Cal Club GP #90</d=
iv><div dir=3D"ltr" data-setdir=3D"false"><br></div><div><br></div>
=20
</div><div id=3D"yahoo_quoted_3763589605" class=3D"yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Sunday, August 4, 2024 at 11:02:18 AM PDT, yello=
w04 via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
=20
=20
<div><div dir=3D"ltr">I am throwing this out there as a pub=
lic service announcement, I broke a <br></div><div dir=3D"ltr">part that I =
thought we had bulletproof solution to. At PittRace last <br></div><div dir=
=3D"ltr">weekend I broke one of Southwick's aluminum front hubs. The area o=
f the <br></div><div dir=3D"ltr">hub that the inner race presses into shear=
ed off, thankfully the wheel <br></div><div dir=3D"ltr">was retained by the=
outer bearing and stayed on the car. I don't know <br></div><div dir=3D"lt=
r">for how many laps that would have been the case!<br></div><div dir=3D"lt=
r"><br></div><div dir=3D"ltr">Has anybody else heard of one of these hubs f=
ailing?<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Discussions wi=
th Richard Good, who took over manufacturing these hubs <br></div><div dir=
=3D"ltr">revealed his hubs are turned from a stronger material, the GoodPar=
ts <br></div><div dir=3D"ltr">hubs are made from 7075 T6 aluminum, while So=
uthwick made theirs from <br></div><div dir=3D"ltr">6061 T6. Yes, it is a l=
ittle heavier, but the GoodParts hub is still <br></div><div dir=3D"ltr">ab=
out a pound lighter than stock. If you are unsure where your hubs were <br>=
</div><div dir=3D"ltr">made, I provided details in the writeup.<br></div><d=
iv dir=3D"ltr"><br></div><div dir=3D"ltr">I have also been in contact with =
Chuck Gee, our resident metallurgist. <br></div><div dir=3D"ltr">He is sugg=
esting anybody running these Southwick hubs should start a <br></div><div d=
ir=3D"ltr">program of dye penetration testing.<br></div><div dir=3D"ltr"><b=
r></div><div dir=3D"ltr">Pictures and writeup here.<br></div><div dir=3D"lt=
r"><br></div><div dir=3D"ltr"><a href=3D"https://tr250racer.com/southwick-f=
ront-hub-failure/" target=3D"_blank">https://tr250racer.com/southwick-front=
-hub-failure/</a><br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Hope=
this helps everybody keep the shiny side up!<br></div><div dir=3D"ltr"><br=
></div><div dir=3D"ltr">Henry Frye<br></div><div dir=3D"ltr">______________=
_________________________________<br></div><div dir=3D"ltr"><a ymailto=3D"m=
ailto:fot@autox.team.net" href=3D"mailto:fot@autox.team.net";>fot@autox.team=
.net</a><br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><a href=3D"ht=
tp://www.fot-racing.com" target=3D"_blank">http://www.fot-racing.com</a><br=
></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Donate: <a href=3D"http:=
//www.team.net/donate.html" target=3D"_blank">http://www.team.net/donate.ht=
ml</a><br></div><div dir=3D"ltr">Archive: <a href=3D"http://autox.team.net/=
archive" target=3D"_blank">http://autox.team.net/archive</a> <a href=3D"htt=
p://www.team.net/pipermail/fot" target=3D"_blank">http://www.team.net/piper=
mail/fot</a><br></div><div dir=3D"ltr">Unsubscribe/Manage: <a href=3D"http:=
//autox.team.net/mailman/options/fot/moosehd2@pacbell.net" target=3D"_blank=
">http://autox.team.net/mailman/options/fot/moosehd2@pacbell.net</a><br></d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br></div></div>
</div>
</div></body></html>
------=_Part_1824808_2093619358.1722805133945--
--===============0253063241490535768==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
--===============0253063241490535768==--
|