<div style="font-size:14pt;font-family:comic sans ms,sans-serif;color:black;"><div style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:black;"><br>I just had to tear this diff down due to a broken output axle flange. It broke at the typical stress point at the keyway when the clutch started acting up (grabbing) and that put too much instant torque thru everything...yeah the hip bone connected to the ... The diff gears and bearings were all in great shape, the pattern looked good and the clearances were spot on. Even the Detroit locker looked good. So, who has installed a cooler on their diff, and how did you route it? The pickup part should be pretty simple, but I don't know whether to just reintroduce the oil back into the diff at some recess, or should it be aimed on the ring or pinion gears directly? I can see plus and minus aspects to each style of setup.<br>Anyone have good empirical evidence for either?<br>What sort of pump did you use?<br>What sort of cooler did you use...radiator style matrix or just a tube with fins attached (like a power steering cooler)?<br><br>Never considered cool myself...<br>Nick in Nor Cal<br><br>-----Original Message-----<br>From: Marcel Van Mulders <van.mulders.marcel@telenet.be><br>To: malaboge <malaboge@aol.com><br>Cc: fot <fot@autox.team.net><br>Sent: Fri, Aug 12, 2016 12:41 am<br>Subject: RE: [Fot] IRS Diff Cover<br><br></div>
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<div dir="ltr" align="left"><span style="color: #0000ff; font-family: Arial; font-size: small;" data-mce-style="color: #0000ff; font-family: Arial; font-size: small;" face="Arial" color="#0000ff" size="2"><span class="aolmail_561542107-12082016">Some years ago, I tried a new 4.33 pinion and
crownwheel : after a road test, the differential housing was already
very very hot. No way to race with that. It was installed
correctly and running quiet.Returning to the original 4.1 pinion and
crownwheel in the same casing and the same LSD solved this problem. The
temperature of the diff is a result of how much heat is generated and how much
heat is transferred to the air. Probably an overheating diff can also be
caused by too much heat that is generated? LSD of course, but also the heat
generated by the pinion and crownwheel because of some fault of the parts
or the installation. </span></span></div>
<div dir="ltr" align="left"><span style="color: #0000ff; font-family: Arial; font-size: small;" data-mce-style="color: #0000ff; font-family: Arial; font-size: small;" face="Arial" color="#0000ff" size="2"><span class="aolmail_561542107-12082016">Marcel</span></span></div><br>
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<span style="font-family: Tahoma; font-size: small;" data-mce-style="font-family: Tahoma; font-size: small;" face="Tahoma" size="2"><b>Van:</b> Fot [<a removedlink__7e7ed86f-bbdd-454b-a60a-568204435970__href="mailto:fot-bounces@autox.team.net?">mailto:fot-bounces@autox.team.net</a>]
<b>Namens </b><a removedlink__7e7ed86f-bbdd-454b-a60a-568204435970__href="mailto:malaboge@aol.com">malaboge@aol.com</a><br><b>Verzonden:</b> woensdag 10 augustus 2016
05:37<br><b>Aan:</b> <a removedlink__7e7ed86f-bbdd-454b-a60a-568204435970__href="mailto:pvucinic@netspace.net.au">pvucinic@netspace.net.au</a>;
<a removedlink__7e7ed86f-bbdd-454b-a60a-568204435970__href="mailto:fot@autox.team.net">fot@autox.team.net</a><br><b>Onderwerp:</b> Re: [Fot] IRS Diff
Cover<br></span><br></div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: arial,helvetica,sans-serif; COLOR: black">Nope,
no chance of the exhaust...or anything else that might be hot back there. The
heat looked like it came from the diff cover out to the poly bush. The bush was
melted the most on the back edge where the cover had the biggest mass next to
the bushing.<br>And this is with a Detroit locker, no heat building clutches
inside!<br><br><br>-----Original Message-----<br>From: Peter Vucinic
<<a removedlink__7e7ed86f-bbdd-454b-a60a-568204435970__href="mailto:pvucinic@netspace.net.au">pvucinic@netspace.net.au</a>><br>To: malaboge
<<a removedlink__7e7ed86f-bbdd-454b-a60a-568204435970__href="mailto:malaboge@aol.com">malaboge@aol.com</a>><br>Sent: Tue, Aug 9, 2016 5:45 am<br>Subject: Re: [Fot]
IRS Diff Cover<br><br></div>
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<div>Wow! Melted poly mounts! Never seen that before! Sure it's not the exhaust
systems proximity to the differential casing that's adding to the
equation?<br><br>Regards
<div>Peter Vucinic</div></div>
<div><br>On 9 Aug 2016, at 11:55 AM, <a target="_blank" removedlink__7e7ed86f-bbdd-454b-a60a-568204435970__href="mailto:malaboge@aol.com">malaboge@aol.com</a> wrote:<br><br></div>
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<div style="FONT-SIZE: 14pt; FONT-FAMILY: comic sans ms,sans-serif; COLOR: black">Oh
I'm so jealous of that finned alum diff cover!<br>BUT, a more practical
question...do you think the most oil capacity, or directed internal oil
dispersion is more important. (Already using RedLine heavy shock proof
oil).<br>Some history...<br>The Duke of Oil, our 4A has melted a set of the
poly mounts (see a previous pic someone else submitted...same deal here)
in a normal sprint race. So, diggin thru the pile-o-parts I find I have
an early one piece TR6(?) diff cover that is pretty much a square reservoir in
the back (the oil reservoir area looks about like the reservoir on the 2 piece
4A diff cover), and another later (?) one piece cover that directs the oil
flingin around in the diff toward the ring gear and has more fins on it.
However, the later more heavily finned unit holds about 8 ounces less fluid,
but it directs the oil directly onto the gear and has those additional fins.
<br><br>I would really like to skip the oil pump and cooler setup in the back
of the car, but may have to go that way anyhow.<br><br>BUT,<br>Has anyone had
any experience with running the later, smaller oil capacity but more finned
and directed oil units? And how would it compare to the larger open chamber
cover?<br><br>If not, who has installed a pump and cooler back there? What did
you use for a cooler and where did you put the outlet and inlet on the
diff...and why?<br><br>Usually in hot water myself...this time
oil!<br><br>Nick in Nor Cal<br></div></div></blockquote>
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