GT4 strut top failure
Discussion
gtsralph said:
Thanks for the link that is what I was hoping for. Clearly an issue for sustained track use.memo to brain avoid the big kerbs
Inclined to agree. I'd expect to see a wheel failure before a chasis failure. I've seen some very big accidents with 996 and 997 race cars but never seen the chasis break at a load point through an impact. Sometimes a wishbone can punch through a pick up point but if its a race car, the spherical joint normally collapses and takes energy from the impact first.
I drove for a racing car manufacturer at the start of my racing career, he was a brilliant designer and taught me a lot about chassis design and the theory behind it. The load point of the front suspension are 'the' critical points of the design. They transfer loads backwards into the space frame or monocoque where they would disperse with the minimum of flex or disortion. Obviously in these cases the load/shock has not been successfully transferred backwards into the chasis resulting in the failure of the load point.
I drove for a racing car manufacturer at the start of my racing career, he was a brilliant designer and taught me a lot about chassis design and the theory behind it. The load point of the front suspension are 'the' critical points of the design. They transfer loads backwards into the space frame or monocoque where they would disperse with the minimum of flex or disortion. Obviously in these cases the load/shock has not been successfully transferred backwards into the chasis resulting in the failure of the load point.
According to the link above, the part labeled "11" is failing . Coming from a completely different design/engineer background, I would be curious to know why is that part failing from the racing/engineer experts? Geometry? material? both The white Cayman accident image also shows, there is a very strange bonding agent on the edge of the struts? (might be image accuracy or my lack of visual knowledge in the area)
The white Cayman accident image also shows, there is a very strange bonding agent on the edge of the struts? (might be image accuracy or my lack of visual knowledge in the area)Trev450 said:
This ^. In a previous life, I spent a good bit of time attempting to master the art of forest rallying in a MK11 Escort. I blew front struts, bent front struts, broke TCA's, etc, but never did I see this sort of failure on anything both at club and international level.
As you'll know all too well, the rally prep boys don't p*ss about when they do shell prep, they build the cars properly to withstand massive jumps, ruts, potholes etc.My old S5 Impreza WRC after an expensive altercation with a bridge parapet on Mull (the chassis leg was bent up nearly 3") :
|http://thumbsnap.com/1RBROmOq[/url]
Bulkhead split :
It cracked the alloy strut top mount, but it remained in it's correct position (ie didn't punch through the bonnet)
Strut seen here with new replacement top mount plate and strut casing.
Repairs underway :
Note the new turret top is formed from 10mm thick steel blank Tig'd in place ....
And the finished job :
There was some nice/clever fabbing work on those first Impreza WRC cars, but fast forward 5-6 years and the game had well and truly moved on :
But a rally cars has to do things that racecars couldn't even contemplate, and everyone knows rallying sorts the men from the boys ....
Porsche seem to be making road cars you can't track hard
When did this new turn around occur
Utter sh te that seems to be bad engineering, a shoddy design that they engineer out if you pay considerably more for a racing model
Awful
Used to be that you could track your road car.
It's how they sold them in the US
When did this new turn around occur
Utter sh te that seems to be bad engineering, a shoddy design that they engineer out if you pay considerably more for a racing model
Awful
Used to be that you could track your road car.
It's how they sold them in the US
Edited by stuttgartmetal on Friday 2nd September 09:03
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