[Fot] IRS Diff Cover

[Marcel Van Mulders]

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. 
Marcel

  _____  

Van: Fot [mailto:fot-bounces at autox.team.net] Namens malaboge at aol.com
Verzonden: woensdag 10 augustus 2016 05:37
Aan: pvucinic at netspace.net.au; fot at autox.team.net
Onderwerp: Re: [Fot] IRS Diff Cover


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.
And this is with a Detroit locker, no heat building clutches inside!


-----Original Message-----
From: Peter Vucinic <pvucinic at netspace.net.au>
To: malaboge <malaboge at aol.com>
Sent: Tue, Aug 9, 2016 5:45 am
Subject: Re: [Fot] IRS Diff Cover


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?

Regards 
Peter Vucinic

On 9 Aug 2016, at 11:55 AM, malaboge at aol.com wrote:



Oh I'm so jealous of that finned alum diff cover!
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).
Some history...
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. 

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.

BUT,
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?

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?

Usually in hot water myself...this time oil!

Nick in Nor Cal


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