Cracks in GTS Rims - Now With Pics
09-21-2005, 08:05 PM
#16
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Bigs- confirm that your car had the wheels shown in your icon- that is, the C2 wheels vs. the later "Cup" wheels...?
N
PS- plannin' on checking my wheels later today...
N
PS- plannin' on checking my wheels later today...
09-21-2005, 08:07 PM
#17
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Originally Posted by ew928
Cracked a Porsche Dyno rim once. Hit highway pothole hard. Bent rim and
cracked the cast alloy rim. But that had obvious bend.
Wasn't any pic of the full wheel. Are the cracks even along the rim edge?
And how was the rear wheel alignment on the GTS wheels were on?
Massive rear wheel camber? As in inside edge of rear tires worn in
couple thousand miles.
I've bent BBS rims before. But never cracked aluminum before till the Porsche factory
rim died.
Ernest (NYC)
cracked the cast alloy rim. But that had obvious bend.
Wasn't any pic of the full wheel. Are the cracks even along the rim edge?
And how was the rear wheel alignment on the GTS wheels were on?
Massive rear wheel camber? As in inside edge of rear tires worn in
couple thousand miles.
I've bent BBS rims before. But never cracked aluminum before till the Porsche factory
rim died.
Ernest (NYC)
09-21-2005, 08:09 PM
#18
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Originally Posted by Normy
Bigs- confirm that your car had the wheels shown in your icon- that is, the C2 wheels vs. the later "Cup" wheels...?
N
PS- plannin' on checking my wheels later today...
N
PS- plannin' on checking my wheels later today...
09-21-2005, 08:15 PM
#20
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Mine are the original C2 wheels. Car has about 84K miles.
I am going to check all my wheels again to be safe.
The place where I had the wheels welded were not concerned about cracks and it appears to be a common problem.
I am going to check all my wheels again to be safe.
The place where I had the wheels welded were not concerned about cracks and it appears to be a common problem.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
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928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
09-21-2005, 08:26 PM
#21
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Originally Posted by Weissach
What profile tires were on these rimes?
Fronts: 225/45 R17 91W
Rears: 275/40 R17 98W
These are relatively new tires and were on the old rims for perhaps 2K miles.
I don't recall what tires were on the car when I bought it.
09-21-2005, 10:00 PM
#22
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Very strange - all on the inside. How could this happen? Had these been chromed we would have had the old standby, hydrogen embrittlement, to blame.
09-21-2005, 10:38 PM
#23
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Originally Posted by Bill Ball
Very strange - all on the inside. How could this happen? Had these been chromed we would have had the old standby, hydrogen embrittlement, to blame.
I'll tell yew whut! As I think back about merrily tooling along at 140 mph a few times - not to mention a lot of very spirited driving in the twisties - on those rims...
...it'll just about turn yer tighty-whiteys into loosey-brownies!
09-21-2005, 10:53 PM
#25
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Originally Posted by Ketchmi
Bigs, I'll never work on your interior again!
""Dave, what's that smell? Well Garrity, that's caused by cracked rims!""
""Dave, what's that smell? Well Garrity, that's caused by cracked rims!""
It's one 'o them "side effect" things that we docs understand very well!
I'm startin' to think I'll be bringin' the shark up on a weekly basis to put it on your lift and go over my rims with a magnifying glass!
I must be gettin' too old. Don't have that sense of invincibility any more!
09-21-2005, 11:27 PM
#26
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I always check my rims everytime I remove them. I show my cars as well as autocross and drive them hard. So after driving and messing everything up I pull the wheels to clean inside and inspect them. I actually cracked a Fuchs forged alloy once which is not easy to do.
Strange how it has only occured on the inside lip. Were these rims ever refinished using a high temperature stripper? Plating and refinishing houses usually use high temp stripping solutions reaching temperatures upwards of 550 degrees for 1/2 hour or more to remove the finish. This will anneal the casting destroying the temper which can result in this kind of damage after the wheel has been placed under high stress loads.
I don't think this is typical of most wheels. You can weld the wheels but I would recommend reprocessing them to regain adequate tensile strength.
Strange how it has only occured on the inside lip. Were these rims ever refinished using a high temperature stripper? Plating and refinishing houses usually use high temp stripping solutions reaching temperatures upwards of 550 degrees for 1/2 hour or more to remove the finish. This will anneal the casting destroying the temper which can result in this kind of damage after the wheel has been placed under high stress loads.
I don't think this is typical of most wheels. You can weld the wheels but I would recommend reprocessing them to regain adequate tensile strength.
09-21-2005, 11:48 PM
#27
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Originally Posted by cobalt
I always check my rims everytime I remove them. I show my cars as well as autocross and drive them hard. So after driving and messing everything up I pull the wheels to clean inside and inspect them. I actually cracked a Fuchs forged alloy once which is not easy to do.
Strange how it has only occured on the inside lip. Were these rims ever refinished using a high temperature stripper? Plating and refinishing houses usually use high temp stripping solutions reaching temperatures upwards of 550 degrees for 1/2 hour or more to remove the finish. This will anneal the casting destroying the temper which can result in this kind of damage after the wheel has been placed under high stress loads.
I don't think this is typical of most wheels. You can weld the wheels but I would recommend reprocessing them to regain adequate tensile strength.
Strange how it has only occured on the inside lip. Were these rims ever refinished using a high temperature stripper? Plating and refinishing houses usually use high temp stripping solutions reaching temperatures upwards of 550 degrees for 1/2 hour or more to remove the finish. This will anneal the casting destroying the temper which can result in this kind of damage after the wheel has been placed under high stress loads.
I don't think this is typical of most wheels. You can weld the wheels but I would recommend reprocessing them to regain adequate tensile strength.
Tell me what you mean by reprocessing? Sounds interesting.
09-22-2005, 02:19 AM
#28
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Hi Bill,
Hydrogen embrittlement is much more common in alloyed and heat treated steels. Not seen in aluminum alloys often. Stress cracks more likely. I have seen these wheels broken before, but always from the sensor hole out.
Hydrogen embrittlement is much more common in alloyed and heat treated steels. Not seen in aluminum alloys often. Stress cracks more likely. I have seen these wheels broken before, but always from the sensor hole out.
09-22-2005, 07:25 AM
#29
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Originally Posted by fst951
Hi Bill,
Hydrogen embrittlement is much more common in alloyed and heat treated steels. Not seen in aluminum alloys often. Stress cracks more likely. I have seen these wheels broken before, but always from the sensor hole out.
Hydrogen embrittlement is much more common in alloyed and heat treated steels. Not seen in aluminum alloys often. Stress cracks more likely. I have seen these wheels broken before, but always from the sensor hole out.
