[Fot] Gt6 differential failure

[Peter Vucinic]

Great question!
I'll answer this for you when I get back tonight. 
I'm traveling to mine site to replace a 1000HP 2 shaft gearbox that has suffered low oil level foaming. Your timing is perfect!

Regards
Peter Vucinic
CBA Rotative Engineers
Sent from Mobile Phone

> On 14 Jul 2015, at 04:44, Scott Janzen <sjanzen at me.com> wrote:
> 
> so, while I respect the need proper operating temps, if the failure experienced is not bearing failure, but simply gear teeth breaking off under load, would lower temps help?  
> I run Redline synthetic. 
> 
> On Jul 13, 2015, at 2:32 PM, Peter Vucinic wrote:
> 
> Get the oil temp down and use full synthetic.
> I did much testing on my road going TR4 diff. Even a road car, at highway speed cruising, the oil temp is 180-200F.
> With the diff ‘tucked up’ and limited air flow. You are starting with a problem before you start!
>  
>  
> "You can Make a Small Fortune From Motor Racing. As long as You Started With A Lage Fortune!"
> Kind Regards
> Peter Vucinic
> TR4 - TR7 V8 - Spitfire MkII
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> From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of Scott Janzen
> Sent: Tuesday, 14 July 2015 12:20 AM
> To: Jason Ostrowski
> Cc: 'Friends of Triumph' Triumph
> Subject: Re: [Fot] Gt6 differential failure
>  
> thanks, Jason - yes, I was banging through the gears, and there's now a steep 150' +/- DROP at this track, downhill turn, where I was in second gear at 7,000 RPM, first accelerating, then letting it slow me down as I approached the sharp right to the uphill climb.  I'm sure that did not do the diff any good.
>  
> Somehow the idea of putting a Subaru diff in this car does not feel very "vintage".
>  
> Question - has anyone checked the oil temp, and would cooling make a difference?  I do run Redline 75-85 gear oil.
>  
> I will report back and send carnage photos when I get it out.
>  
> On Jul 13, 2015, at 10:12 AM, Jason Ostrowski wrote:
>  
> I agree that it is consumable.
> A change to something different would seem to lead to a redesign of all the parts that mate to it and that could turn into a whole new set of other related projects.
> Likely a costly and complex endeavor to say the least.
> Knowing you, I assume you are using a quality oil already as Steve recommends.
> I notice you are racing faster lately and seem to be doing great with the car.
>  
> Begin Public Service announcement to all FoT...
>  
> That being said, (especially the faster you go) don't forget to remind yourself regularly about how you need to treat the drivetrain.
> Perhaps most importantly on this issue is careful driving with a constant focus to smooth transition between the gears.
> And really important is super smooth take-offs.
> I'm lucky to have John Reed (best GT6 racer of all time) at the track with me most of the time.
> He is never afraid to remind me of this.
> And does so on a regular basis when I'm leaving the grid.
> Even after all these years of coaching he will still often yell at me through my helmet prior to taking off.
> something like....
>  "Ride that F$#&%ng clutch baby!!"
> or "Easy take off".
> Wisdom I'm not afraid to admit I need to be reminded of in a tense moment taking off to hit the track.
> One slip of the foot or abrupt start is all it takes to do damage to the differential.
> I can trace most of my differential failures back to sketchy shift transitions or abrupt starts...
> We all hate to admit that an equipment failure is our own fault but, speaking for myself, I know it often is.
> This was an FoT Public Service Announcement...
> Brought to you by Friendly Ghost Racing.
>  
> Jason Ostrowski
> Friendly Ghost Racing 
> 1969 Triumph GT6+ Racecars   
>  
>  
> On Sun, Jul 12, 2015 at 7:01 AM, Scott Janzen <sjanzen at me.com> wrote:
> Mine disintegrated in a big way in the last race yesterday at Pitt Race. Last one did the same thing about 3-4 years ago.
> Should I just consider this a consumable item, or swap to something stronger?  What are other vintage racers doing?
> 
> Sent from my mobile device
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