[Fot] IRS Diff Cover

[Peter Vucinic]

OK. So if your differential casing is THAT HOT to MELT/DAMAGE a POLY mount, purely from radiant heat, generated by the gear set/differential type? You are in trouble! Poly is good for around 230F. It means that you must be running internal temperature around 300F or greater!

 

Synthetic fluid only and change regularly until you can fit an oil cooler.

 

 

From: malaboge at aol.com [mailto:malaboge at aol.com] 
Sent: Wednesday, 10 August 2016 1:37 PM
To: pvucinic at netspace.net.au; fot at autox.team.net
Subject: 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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