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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