Re: [Fot] IRS diff overheating

[Bill Babcock <Bill@ponostyle.com>]

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I don=E2=80=99t know if you=E2=80=99ve seen the diff cover on Peyote. I =
don=E2=80=99t remember where I got it, but it sure solved my diff =
overheating problems. If nothing else the sheer mass of aluminum helps, =
but it=E2=80=99s deeply finned. I=E2=80=99ve put temp sensing paint on =
it a few times and the outside of the cover never gets above 170F. the =
cast steel banjo never gets above 180F.  I doubt the oil gets much above =
250=E2=80=94there=E2=80=99s none of toasty sulfur smell when I drain it.=20=


> On Jun 2, 2015, at 2:19 PM, Keith Files <keithfiles@btinternet.com> =
wrote:
>=20
> We use a diff cooler to avoid the problem on the TR6, a lot cheaper =
than continual rebuilds of the diff. I ran with one doing 3 hours of the =
Nurburgring Nordschleife a couple of years ago, it worked perfectly.
>=20
> Keith
>=20
> Sent from my iPad
>=20
> On 2 Jun 2015, at 20:01, Kas Kastner <kaskastner@gmail.com =
>=20
>> I had failure of all three cars at Sebring with the IRS cars. In =
practices the diffs overheated and puked oil out the breather tub as you =
describe. I laid part of it to a new diff but most to the heat generated =
by a disc type limited slip. The capacity of the diff is marginal for =
endurance running. Add to the  capacity or add a cooler.=20
>>=20
>> Never be beaten by equipment.
>>=20
>>=20
>> On Tue, Jun 2, 2015 at 10:40 AM, Greg And Alison Blake =
>> Some of yall may have followed the social Media posts provided by our =
teammates through the weekend. We were racing the Beanitos TR6 this past =
weekend at what was to be TWS's last ever race. It was a split 16 hour =
endurance race (Sat&Sun).
>>=20
>> We had a strange failure on Saturday. About 6 hours in, the truck was =
full of gear oil. I had routed a diff vent line to the trunk. Upon =
returning to the garage, we discovered melted poly diff mounts. Pic =
below.
>>=20
>> I've been scratching my head on this one. Prior to boiling the diff =
fluid, we had zero leaks in the freshly serviced diff. I had replaced =
all seals and filled with STALUBE 90WT GL4.
>>=20
>> I've been racing my TR3 using this same diff fluid for 6 years =
(replaced every two weekends). Never a problem with my vintage race car. =
Of course, I've never run the 3 for 6 hours straight.
>>=20
>> Some of the more seasoned endurance racers asked what fluid I had in =
the diff. All suggested that mineral based fluid is not a good choice =
for endurance events.
>>=20
>> I'd love to hear opinions as to the route cause of our failure and =
more importantly, suggested remedies.
>>=20
>> As to the results, the car was running consistently 2:1x laps with a =
fast lap of 2:10. We ended up taking the workers choice award. Had we =
run w/o diff failure and a subsequent battery failure, we could have =
been in the hunt for a podium finish. Fastest lap in our group was =
2:09.9
>>=20
>> Great weekend
>>=20
>>=20
>>=20
>>=20
>> Thanks
>> Greg
>> _______________________________________________
>>=20
>> http://www.fot-racing.com <http://www.fot-racing.com/>
>>=20
>> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
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http://autox.team.net/mailman/options/fot/kaskastner@gmail.com =
<http://autox.team.net/mailman/options/fot/kaskastner@gmail.com>
>>=20
>>=20
>>=20
>>=20
>> _______________________________________________
>>=20
>> http://www.fot-racing.com <http://www.fot-racing.com/>
>>=20
>> Donate: http://www.team.net/donate.html =
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>> Unsubscribe/Manage: =
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>>=20
>>=20
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
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>=20
>=20

Bill Babcock
Bill@ponostyle.com
Editor: Ponostyle
Celebrating Water

Editor: Xtreme Geezer
Fitness and Fun After Forty
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">I don=E2=80=99t know if you=E2=80=99ve seen the diff cover on =
Peyote. I don=E2=80=99t remember where I got it, but it sure solved my =
diff overheating problems. If nothing else the sheer mass of aluminum =
helps, but it=E2=80=99s deeply finned. I=E2=80=99ve put temp sensing =
paint on it a few times and the outside of the cover never gets above =
170F. the cast steel banjo never gets above 180F. &nbsp;I doubt the oil =
gets much above 250=E2=80=94there=E2=80=99s none of toasty sulfur smell =
when I drain it.&nbsp;<div class=3D""><br class=3D""></div><div =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Jun 2, 2015, at 2:19 PM, Keith Files &lt;<a =
href=3D"mailto:keithfiles@btinternet.com"; =
class=3D"">keithfiles@btinternet.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><meta =
http-equiv=3D"content-type" content=3D"text/html; charset=3Dutf-8" =
class=3D""><div dir=3D"auto" class=3D""><div class=3D"">We use a diff =
cooler to avoid the problem on the TR6, a lot cheaper than continual =
rebuilds of the diff. I ran with one doing 3 hours of the Nurburgring =
Nordschleife a couple of years ago, it worked perfectly.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Keith<br class=3D""><br =
class=3D"">Sent from my iPad</div><div class=3D""><br class=3D"">On 2 =
Jun 2015, at 20:01, Kas Kastner &lt;<a =
href=3D"mailto:kaskastner@gmail.com"; =
class=3D"">kaskastner@gmail.com</a>&gt; wrote:<br class=3D""><br =
class=3D""></div><blockquote type=3D"cite" class=3D""><div class=3D""><div=
 dir=3D"ltr" class=3D"">I had failure of all three cars at Sebring with =
the IRS cars. In practices the diffs overheated and puked oil out the =
breather tub as you describe. I laid part of it to a new diff but most =
to the heat generated by a disc type limited slip. The capacity of the =
diff is marginal for endurance running.&nbsp;Add to =
the&nbsp;&nbsp;capacity or add a cooler.&nbsp;</div><div =
class=3D"gmail_extra"><br clear=3D"all" class=3D""><div class=3D""><div =
class=3D"gmail_signature"><p class=3D""><strong class=3D""><font =
color=3D"#000099" class=3D"">Never be beaten by =
equipment.</font></strong></p></div></div>
<br class=3D""><div class=3D"gmail_quote">On Tue, Jun 2, 2015 at 10:40 =
AM, Greg And Alison Blake <span dir=3D"ltr" class=3D"">&lt;<a =
href=3D"mailto:ablake2@austin.rr.com"; target=3D"_blank" =
class=3D"">ablake2@austin.rr.com</a>&gt;</span> wrote:<br =
class=3D""><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex">Some of yall may have =
followed the social Media posts provided by our teammates through the =
weekend. We were racing the Beanitos TR6 this past weekend at what was =
to be TWS's last ever race. It was a split 16 hour endurance race =
(Sat&amp;Sun).<br class=3D"">
<br class=3D"">
We had a strange failure on Saturday. About 6 hours in, the truck was =
full of gear oil. I had routed a diff vent line to the trunk. Upon =
returning to the garage, we discovered melted poly diff mounts. Pic =
below.<br class=3D"">
<br class=3D"">
I've been scratching my head on this one. Prior to boiling the diff =
fluid, we had zero leaks in the freshly serviced diff. I had replaced =
all seals and filled with STALUBE 90WT GL4.<br class=3D"">
<br class=3D"">
I've been racing my TR3 using this same diff fluid for 6 years (replaced =
every two weekends). Never a problem with my vintage race car. Of =
course, I've never run the 3 for 6 hours straight.<br class=3D"">
<br class=3D"">
Some of the more seasoned endurance racers asked what fluid I had in the =
diff. All suggested that mineral based fluid is not a good choice for =
endurance events.<br class=3D"">
<br class=3D"">
I'd love to hear opinions as to the route cause of our failure and more =
importantly, suggested remedies.<br class=3D"">
<br class=3D"">
As to the results, the car was running consistently 2:1x laps with a =
fast lap of 2:10. We ended up taking the workers choice award. Had we =
run w/o diff failure and a subsequent battery failure, we could have =
been in the hunt for a podium finish. Fastest lap in our group was =
2:09.9<br class=3D"">
<br class=3D"">
Great weekend<br class=3D"">
<br class=3D"">
<br class=3D""><br class=3D"">
<br class=3D"">
Thanks<br class=3D"">
Greg<br class=3D"">_______________________________________________<br =
class=3D"">
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