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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=302131907-03062015>I got a diff cover with really big fins from
Racetorations (Darryl Uprichard) some 10 years ago and it's a big difference in
cooling and oil capacity. In 2011 I ran a new 1:4.33 crown and pinion, and this
diff cover was mounted, yet the diff oil got very hot and escaped through the
axle seals. Since then I use to check the T° of the diff casing after races and
practices. I ran 4.1 / 3.9 / 4.33 / 4.55 ratio's
since 2011 and experienced so far that the crownwheel/pinions in the diff
housing made up for most of the T° rising. With an original old Triumph 4.1
crownwheel/pinion the diff housing stayed really cool. Worst is my 4.33
ratio.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=302131907-03062015>I suppose, the friction between pinion and crownwheel,
and hence the heat generated, can be very different depending on
manufacturing, assembling of the parts, running in of the
diff..</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=302131907-03062015>Marcel</SPAN></FONT></DIV><BR>
<DIV lang=nl class=OutlookMessageHeader dir=ltr align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>Van:</B> Fot [mailto:fot-bounces@autox.team.net]
<B>Namens </B>Bill Babcock<BR><B>Verzonden:</B> woensdag 3 juni 2015
0:32<BR><B>Aan:</B> Keith Files<BR><B>CC:</B> FOT<BR><B>Onderwerp:</B> Re: [Fot]
IRS diff overheating<BR></FONT><BR></DIV>
<DIV></DIV>I don’t know if you’ve seen the diff cover on Peyote. I don’t
remember where I got it, but it sure solved my diff overheating problems. If
nothing else the sheer mass of aluminum helps, but it’s deeply finned. I’ve 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—there’s none of toasty sulfur smell when I drain it.
<DIV><BR></DIV>
<DIV>
<DIV>
<BLOCKQUOTE type="cite">
<DIV>On Jun 2, 2015, at 2:19 PM, Keith Files <<A
href="mailto:keithfiles@btinternet.com">keithfiles@btinternet.com</A>>
wrote:</DIV><BR class=Apple-interchange-newline>
<DIV>
<DIV>
<DIV>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><BR></DIV>
<DIV>Keith<BR><BR>Sent from my iPad</DIV>
<DIV><BR>On 2 Jun 2015, at 20:01, Kas Kastner <<A
href="mailto:kaskastner@gmail.com">kaskastner@gmail.com</A>>
wrote:<BR><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV>
<DIV dir=ltr>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. </DIV>
<DIV class=gmail_extra><BR clear=all>
<DIV>
<DIV class=gmail_signature>
<P><STRONG><FONT color=#000099>Never be beaten by
equipment.</FONT></STRONG></P></DIV></DIV><BR>
<DIV class=gmail_quote>On Tue, Jun 2, 2015 at 10:40 AM, Greg And Alison
Blake <SPAN dir=ltr><<A href="mailto:ablake2@austin.rr.com"
target=_blank>ablake2@austin.rr.com</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">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).<BR><BR>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><BR>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><BR>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><BR>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><BR>I'd
love to hear opinions as to the route cause of our failure and more
importantly, suggested remedies.<BR><BR>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><BR>Great
weekend<BR><BR><BR><BR><BR>Thanks<BR>Greg<BR>_______________________________________________<BR><A
href="mailto:fot@autox.team.net">fot@autox.team.net</A><BR><BR><A
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<BLOCKQUOTE type="cite">
<DIV><SPAN>_______________________________________________</SPAN><BR><SPAN><A
href="mailto:fot@autox.team.net">fot@autox.team.net</A></SPAN><BR><SPAN></SPAN><BR><SPAN><A
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