[Fot] IRS diff overheating

[Kas Kastner]

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.

*Never be beaten by equipment.*

On Tue, Jun 2, 2015 at 10:40 AM, Greg And Alison Blake <
ablake2 at 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
>
>
>
>
> Thanks
> Greg
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