Another centre lock failure?
Discussion
Pure speculation, but just seen dale post this off B2G, & I do wonder about these things.....
http://www.youtube.com/watch?v=NbE6OzjyVV0&fea...
Looked painful
http://www.youtube.com/watch?v=NbE6OzjyVV0&fea...
Looked painful
Ouch! The principle of centre-locks can't be to blame - look how many race cars use them - so I guess it must be an issue of whether they're correctly screwed on.
Seems odd though, usually if a wheel starts to get loose you can feel it get a bit wobbly, then slow down and check what the wobble is.
Seems odd though, usually if a wheel starts to get loose you can feel it get a bit wobbly, then slow down and check what the wobble is.
thegoose said:
Ouch! The principle of centre-locks can't be to blame - look how many race cars use them - so I guess it must be an issue of whether they're correctly screwed on.
Seems odd though, usually if a wheel starts to get loose you can feel it get a bit wobbly, then slow down and check what the wobble is.
Any car I've driven I change into fifth gear for pflanzgarten2, I don't know how many threads there are on those centre locks but at fifth gear I'm guessing you'd feel the wobble for a split second before it came loose.Seems odd though, usually if a wheel starts to get loose you can feel it get a bit wobbly, then slow down and check what the wobble is.
Aren't the design of these different to racing centre locks?
Driver unhurt I heard by the way
LaurasOtherHalf said:
Any car I've driven I change into fifth gear for pflanzgarten2, I don't know how many threads there are on those centre locks but at fifth gear I'm guessing you'd feel the wobble for a split second before it came loose.
Aren't the design of these different to racing centre locks?
Driver unhurt I heard by the way
You've gone beyond the limits of my knowledge. I've never been to the 'ring and I don't know anything about the design of these wheels.Aren't the design of these different to racing centre locks?
Driver unhurt I heard by the way
I did notice that it was the offside (based on a RHD car) rear though, which is odd as on that side the wheel's rotating inthe same direction as the thread does to tighten.
The road cars aren't using the race car system though (either of the 2 versions Porsche use)
They have a unique consumer version that requires 11 pages of a manual to cover changing and refitting.
This is where the increasing levels of disquiet are coming from.
It seems like there's at least one report a month of failure and it's never pretty when it does.
Fortunately it's only been vehicles damaged so far.
They have a unique consumer version that requires 11 pages of a manual to cover changing and refitting.
This is where the increasing levels of disquiet are coming from.
It seems like there's at least one report a month of failure and it's never pretty when it does.
Fortunately it's only been vehicles damaged so far.
Recall was pretty early on.
Porsche increased the torque spec and cars were taken in, checked for signs of wheel slip and new nuts fitted.
Hardware all remained the same, nuts just now no longer carried the torque value printed on them.
The first nuts stated the torque value on them which now was no longer correct.
Porsche increased the torque spec and cars were taken in, checked for signs of wheel slip and new nuts fitted.
Hardware all remained the same, nuts just now no longer carried the torque value printed on them.
The first nuts stated the torque value on them which now was no longer correct.
thegoose said:
You've gone beyond the limits of my knowledge.
Here's another gt3 taking a somewhat unorthodox line:http://www.youtube.com/watch?v=E19Y46vnSD0&fea...
It's really a combination of 3 corners, handily called pflantzgarten 1&2 (?!), it's one of the best sequences on the track & one of the things that defines the circuit-remember those shots of CSL's flying from the 70's? That's pflantzgarten 2 (where the camera man is standing on the original vid).
The thing that makes me wonder about the hub failure is he crashes (by the look of it) on the "easy" bit-the uphill left hander before the drop off (or where the 996 gets back in the track after his spin). If it was the end of an accident on the first part I doubt he'd have made it as far as the second.
graemel said:
I must admit I don't like the idea of centre lock wheels on a road car. At least with the race cars you get a locking pin that will prevent the centre lock coming off completely.
This. I've wondered why they didn't bother with a locking pin. I suppose that a retro-fit solution would have to include new hub/spindle assemblies?FarQue said:
This. I've wondered why they didn't bother with a locking pin. I suppose that a retro-fit solution would have to include new hub/spindle assemblies?
They do have a locking system of sorts - a button thingy in the middle of the hub. This engages splines that stop the wheel coming off. I think one issue is that if the wheel is incorrectly fitted, the locking thingy may not be the correct (locked) position...It wouldn't surprise me to find regulars at track days swap wheels themselves without a proper torque wrench.
arcamalpha said:
They do have a locking system of sorts - a button thingy in the middle of the hub. This engages splines that stop the wheel coming off. I think one issue is that if the wheel is incorrectly fitted, the locking thingy may not be the correct (locked) position...
It wouldn't surprise me to find regulars at track days swap wheels themselves without a proper torque wrench.
Ah, I bow to your knowledge Sir. Can I assume you're not supposed to do them up with yer average 'Halfords Professional' socket set?It wouldn't surprise me to find regulars at track days swap wheels themselves without a proper torque wrench.
HoHoHo said:
Over confidence probably.
That is until the wheel falls off mid corner!
It's a 600Nm nut. Without a proper wrench and or torque multiplier you won't ever get it off never mind back on. That is until the wheel falls off mid corner!
Every failure I've seen has involved the hub/spindle shearing right off with the nut still screwed in place.
Edited by fioran0 on Sunday 24th June 22:17
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