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Re: [Fot] IRS diff overheating

To: Greg And Alison Blake <ablake2@austin.rr.com>
Subject: Re: [Fot] IRS diff overheating
From: Chip Collingwood <chip@theukmotorsports.com>
Date: Wed, 3 Jun 2015 10:37:56 -0400
Cc: Amici Triumphi <fot@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: fot@autox.team.net
References: <A9AEF737-7BE7-47EA-B679-EFF4560AEE10@austin.rr.com> <E0562129-59DB-4690-8630-F4E04254A50D@austin.rr.com>
I would recommend the oil cooler route. We had a modified half shaft with 
mechanical pump and belt. It sometimes spit the belt. An electric setup would 
be the best choice given you run an alternator. I don't believe adding capacity 
will get you where you need to be

Sent from my iPhone

> On Jun 3, 2015, at 9:30 AM, Greg And Alison Blake <ablake2@austin.rr.com> 
> wrote:
> 
> 
> Got some great feedback on this one. Such a great list. Just wish I knew 
> before last weekend about this failure mode.  We could have turned another 
> 200+ laps. 
> 
> One follow up. Is there a down side to overfilling an IRS diff unit?  I am 
> thinking I'll install a metal catch can in the trunk and plumb to the bottom 
> of the can. Would putting in another 1/2 quart into the diff aid in cooling 
> or just  get puked out earlier?  If that's not an option, I'll investigate 
> adding a bit of capacity to the cover along with a few fins. 
> 
> Thanks. 
> 
> 
>> On Jun 2, 2015, at 12:40 PM, Greg And Alison Blake <ablake2@austin.rr.com> 
>> wrote:
>> 
>> 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). 
>> 
>> 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. 
>> 
>> 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. 
>> 
>> 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. 
>> 
>> 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. 
>> 
>> I'd love to hear opinions as to the route cause of our failure and more 
>> importantly, suggested remedies. 
>> 
>> 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
>> 
>> Great weekend
>> 
>> <image1.jpeg>
>> 
>> 
>> Thanks 
>> Greg
>> _______________________________________________
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>> 
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