Tuesday, 20 November 2012

Back axle strengthening

This is one in the category that I wouldn't have done to my car, were it not for the fact that a friend managed to break the back axle of his rally car at the end of this stage during the Deutschland Rally. And because he doesn't want to source and adapt a 4HA Jaguar based axle yet, we had a closer look at what had happened.
The problem was caused by a failure of the two puddle welds holding the right hand axle tube into the differential casing. Clearly the amount of torque available from a modified V8 together with the rough stages had been just that bit too much. So we needed a modification.

Searching through some old CCC articles on building a TR7V8 rally car, learned how to solve what is apparently the only weakness of the 5-speed back axle, i.e.: the fitting of the tubes into the differential casing. These tubes are normally pressed into the casings and welds are built up on the tubes through holes already in the casing. These welds are not intended to bond to the casing, but act as spigots or retaining pins. Unfortunately there are only two of these 'puddle' welds per side, and in this case the two on the right hand-side failed.

According to the people at CCC all that appears to be necessary to solve the problem is to increase the number of puddle welds to four per side. But we decide that we would go one stage further for the rally car, so we had a good look at the stiffening plate from a friend's Mk2 Escort back axle. And after some careful measuring on a spare axle and underneath the car, and a strength analyses we came up with this stiffening plate ...



At the time of writing the drawing file is away to a company to give us a quotation to get the plate laser-cut and the brackets machined. And after all the work I put in to get this far I don't see a point in not using one myself. So we will have a small batch made, depending on the price ...

Saturday, 17 November 2012

The RBRR 2012 from the co-driver's seat

It has taken much longer than I hoped for, but at last I finished the photograph's I shot as co-driver with team 44 during Club Triumph's RBRR which took place last month. This was completely caused by the fact that shortly after the event (which coincided with my holiday) I received my new computer, only to find out it wasn't quite the spec I ordered. This issue was sorted without any problems, but it meant I could only start with installing all the software transferring data etc. well after my holiday. Which meant it had to be done in the evening hours. But since last weekend (almost) everything is working as it should, so I could start with the photo's in earnest. Below you'll find a selection of the pictures taken during the run. One way or another there are a fair few wedges in there ...

Meeting up with Gurtie, the car that Dave, Steve and I would have to share for the next 48+ hours;




At the Plough it was business as usual, with a parking area overflowing with Triumph's, lots of last minute spannering going on, and rain of course;








Just after 18:00h we were flagged of, to join the Friday evening rush hour traffic of Enfield and the A10. Heading into the night towards Blythe, Carter Bar (don't mention Lambrini in Scotlandshire for the next decade or two) and towards Edinburgh Airport. Best moment of this part of the route must have been the HGV that almost literally came flying at full blast, over one of the many blind brows in the A68 (which north of the border seems to be called the 'roller coaster' for obvious reasons).







From Edinburgh Airport we headed further north towards the next stop at Skiach Services ...




and from there ever deeper into the night and further North towards John O'Groats for breakfast ...








After a hearty breakfast it was time to start the long haul down South towards Land's End. But first we had to cross Scotland from North to South ...







... to get back to England and into the twilight zone of Tebay Services. One way or another we were constantly being chased by or chasing wedges ...





Next stop, Gledrid Services ...





Deepest darkest Wales, the Sugar Loaf control ...



Whitehouse Services ...



And finally dawn (and breakfast) at Land's End ...





With breakfast finished it was time for the final stages back to Enfield. So we left LE and headed North for the picturesque control stop at Bude Castle ..





After Bude I was so busy with the navigating that I didn't take much more pictures. So to finish this selection a few photo's of some of the people who made it all possible, a tribute to all the volunteers who marshalled at the various control stops. And a handful of the supporters in the night ...




Did anyone mention Lambrini?








For a more complete write-up of "our" RBRR have a look at Steve's weblog. And a few more pictures can be found in the photo album  on the Club Triumph website
.

Oohh ... and as for the car of the event, in my humble opinion that must be Mike Weaver's fantastic Stag powered 4x4 Mk2 Estate prototype, here with Mike busy with his routine-control-stop-check at Bude Castle ...


And will this be the car of the event for the RBRR 2014?