157 replies to this topic

[Gedi]

That first pic is not double sheer by the looks of it, if you notice it still has only a single central bolt to mate the new bracket to the upright.

 

Yeah, but it's clamped up across a larger surface, which should make it much stronger. The weak component then has the double mount.

IMO, it's an improvement over OEM

[mbes2]

A 997 GT3 

 

[slindborg]

 

That first pic is not double sheer by the looks of it, if you notice it still has only a single central bolt to mate the new bracket to the upright.

 

Yeah, but it's clamped up across a larger surface, which should make it much stronger. The weak component then has the double mount.

IMO, it's an improvement over OEM

 

 

did the joint (as in the spherical bearing) break or did the bolt fail in Zoo's case.... ahh the bolt.

 

IF the bolt wasn't torqued properly (for whatever reason, I don't care and I'm not blaming) then even a double sheer mount wouldn't have saved it imho.

[mbes2]

Just found some details about the lotus elise cup cars used them 

[Gedi]

did the joint (as in the spherical bearing) break or did the bolt fail in Zoo's case.... ahh the bolt.

 

IF the bolt wasn't torqued properly (for whatever reason, I don't care and I'm not blaming) then even a double sheer mount wouldn't have saved it imho.

 

 

From what I've seen, it's always appears to be the bolt (between rod end and hub) that fails.

At least with the double mount, even if it comes loose, you can rely on the strength of the bolt's diameter which should avoid it sheering.

[Zoobeef]

As new hubs are restrictivly expensive then the solutions are.

 

Standard links - torque before trackday - replace every 2 years.

"Uprated" - torque before trackday - if you don't track then check torque at the yearly service.

 

That's what I'll be doing now, although I assume ill take the first few laps with a clenched buttocks when I get back on track

[Dakkon]

Ouch

[slindborg]

As new hubs are restrictivly expensive then the solutions are.

 

Standard links - torque before trackday - replace every 2 years.

"Uprated" - torque before trackday - if you don't track then check torque at the yearly service.

 

That's what I'll be doing now, although I assume ill take the first few laps with a clenched buttocks when I get back on track

 

You know what they say, Live and learn  

[mbes2]

Also happens on the mgf http://bugman23.free.fr/crash/01.JPG

[siztenboots]

any solution could be improved with a bit of white marker paint across the bolt and nearest surface

[slindborg]

any solution could be improved with a bit of white marker paint across the bolt and nearest surface

 

 

Or balls out and wire tag  

[Spitfire Engineering]

Solution

 

[Zoobeef]

Spitfire. That's what's snapped.

[Spitfire Engineering]

Spitfire. That's what's snapped.

 

These ones don't snap though, this is the M12 conversion we have been doing for some time now.

[siztenboots]

even the nitron uprights have been known to fatigue

 

 

and pilbeam have their own features

[FLD]

even the nitron uprights have been known to fatigue

 

 

 

 

I thought that one wasn't checked for torque so the Ti spindle was loose in the upright and it unwound until it eventually pulled out.  There is a nice ppic somewhere with the centre broken out of one though!

[Zoobeef]

Right,  may have found an issue. Took the other side apart and that bolt has bent (8.8) but the way it's together looks wrong (too me)


Looking at this picture of the way it was assembled there are 3 washers above the top spacer. In effect lowering the bearing point and creating a larger lever. I take it that is not right?? Talking to elise parts at the min too.

[Zoobeef]

Spitfire. That's what's snapped.

  These ones don't snap though, this is the M12 conversion we have been doing for some time now.

What's involved to adapt too that? M12 bearing, spacers and machine the hub to M12?

[FLD]

How old are the bolts?  Following the seloc thread too and someone suggested lifing the bolts.

 

ETA:

It seems they haven't really seen it before from the responses.  I guess VX owners drive harder

Edited by FLD, 24 April 2015 - 01:01 PM.

[Zoobeef]

At least the 2 years I've had the car.