[Fot] Endurance TR6 at COTA

Mon Aug 8 11:45:47 MDT 2016

This is in a TR6 and I chose the latter style cover with the idea that it had more surface area.  If you are familiar, the later TR6 aluminum cover has a recess that wraps around the ring gear. 

The car ran all day Saturday, almost eight hours straight without overheating, with synthetic gear oil.  It overheated Sunday at 5.5 hours and I think it was a pinion gear failure that heated up the oil excessively. Still, the finned cover is a good idea and I just ordered one. 285 LB’s or about $375.00. They had the lower  steering knuckles too so I’ll be replacing the rubber upper joint.

Thanks FOT for the parts knowledge and lookup. It is much appreciated.

Bob Kramer

From: John Styduhar [mailto:johnstydo at gmail.com] 
Sent: Monday, August 08, 2016 12:11 PM
To: Bob Kramer
Cc: Bill Babcock; Fot
Subject: Re: [Fot] Endurance TR6 at COTA

Those bosses could also be used for a watts link setup.  Like Bill, I would have to remove my pan hard rod to fit this cover (which I am not doing). With the short (20 min. or less) races that I enter, I don't see diff oil cooling as a problem. I would also look into modifying a TR5/6 rear cover which looks like it has more capacity than the stock steel one. 

On Sun, Aug 7, 2016 at 8:00 PM, Bob Kramer <rkramer3 at austin.rr.com> wrote:

I'm guessing the four bosses will take a TR4A style IRS bracket. This looks like a worthy upgrade. We are going to add a pump and cooler for sure. 

This time I think we had a more traditional pinion failure rather than heat related.  I felt it chunk something in the first hour of the event when it was still pretty cool. It later calmed down to the point other drivers said they didn't hear it. 

I'll pull it and find out soon.

Sent from my iPhone

On Aug 7, 2016, at 6:10 PM, Bill Babcock <ponobill at gmail.com> wrote:

See if you can find one of these diff covers. About three times the oil capacity and a heck of a lot more cooling. Fitting it might be a challenge, but it solved my frying diff problem completely. That and RedLine diff oil.  No, I don’t remember where I got it. sorry. Maybe someone else knows where they come from. As you can see by the empty bracket, I didtched my panhard rod to run this thing. Subbed in the solid brass spring eyes and big washers from Joe (I think, great memory) which keeps the axle centered almost as well. . 

<IMG_0453.jpg>

On Aug 7, 2016, at 6:52 AM, Greg Blake <gblake58tr3 at icloud.com> wrote:

Just a quick update. We were beaten by equipment at approximately 1:30 yesterday afternoon. Although certainly disappointed not to take the flag, we were all pretty proud of the old girl. She put in a solid 8 hours Friday and another 5.5 on Saturday. 

We were racing cars from the past two decades with a few exceptions. Out of 100+ cars, there was a pair of 60s mustangs, an Opel with a LS motor and us. Friday we finished 47th with 114 laps and yesterday 73 with 81 laps.  We were averaging 3:10s around the full F1 course. As a point of reference, the leaders were running consistent 2:50s. A certain pair of drivers on our team were clipping close to 2 minute laps and both swore they weren't pushing too hard, maybe.

We were running with 18 month old 200 tried wear tires that had been flat spotted at the last race. This became very noticeable at 100+ down the straights. We again limited RPMs to save the motor.  With a 3.7 rear end and no OD we were full speed about 1/2 into the straights.  This is where the leaders would pass us.

Some of you recall last summer we raced this car with WRL in the June Texas heat and had some issues with lower than desirable oil pressures and a diff that boiling its juice. 

For the engine side of things:  This time around we installed an oil cooler and used VR1 full synthetic. Oil pressure at full tilt was 90+ all weekend and 40-50 at idle at pit stops.  Problem solved. I am very impressed with synthetic motor oil. The oil still looks brand new after 13+ hours of racing. I know from past endurance races with Dino oil, it would be pitch black and stinky at this point. 

On the diff side (not so good):  after boiling the Dino based lubricant last summer, we opted to simply switch to synthetic. This seemed to be working on Friday as our diff catch can stayed dry. We had some terrible noises coming from the rear end on Friday that we thought were hub bearings going out.  The hub bearings are still suspect and will require attention. But our more serious problem was heat in the diff. The diff puked at about 1:30 and our day was done. 

Last summer Keith mention his solution was a diff cooler and I think we will be heading down that path for the next endurance race. Who knows, we may end up with a triumph that can go the distance, eventually. 

We were so close this time.

Sent from my iPhone

On Aug 5, 2016, at 5:53 PM, Greg Blake <gblake58tr3 at icloud.com> wrote:

We finished the day strong. Only a brief stint in the garage to check some bearings. Other than that, ran all day long in the Texas heat. Right now 47th out 100+

Notice the only hood down in the pic?

<IMG_0793.JPG>

Sent from my iPhone
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