Beware of Prothane Guibos
09-04-2011, 08:33 AM
#1
Beware of Prothane Guibos
Our second weekend since installing the hoopty Prothane Six Shooter guibos was cut short by a failure.
The urethane bushings melted and extruded from the sleeves. The second picture below shows one of three intact bushings on the left and one of the failed bushings on the right.
Anyone considering these for a track or race car beware, they are not up to the task.
The urethane bushings melted and extruded from the sleeves. The second picture below shows one of three intact bushings on the left and one of the failed bushings on the right.
Anyone considering these for a track or race car beware, they are not up to the task.
09-05-2011, 06:15 AM
#2
Le Mans Master
Our second weekend since installing the hoopty Prothane Six Shooter guibos was cut short by a failure.
The urethane bushings melted and extruded from the sleeves. The second picture below shows one of three intact bushings on the left and one of the failed bushings on the right.
Anyone considering these for a track or race car beware, they are not up to the task.
The urethane bushings melted and extruded from the sleeves. The second picture below shows one of three intact bushings on the left and one of the failed bushings on the right.
Anyone considering these for a track or race car beware, they are not up to the task.
09-05-2011, 09:39 AM
#3
Instructor
Member Since: Sep 2010
Location: Vero Beach Florida
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Failure mode
I see what happened to the urthane inserts. Did this cause a catastrophic failure to the shaft/torque tube or just major vibration that ended the day?
09-05-2011, 10:45 PM
#7
Race Director
I wonder if it's all about heat, as the poly suspension bushings last fine (other issues like squeak, bind if not lubed) but they don't "break".
Or are there different grades of poly?
Or are there different grades of poly?
09-05-2011, 11:53 PM
#8
I wouldn't expect suspension bushings to see 250+ degrees.
I've seen pro teams "ventilate" the torque tube because of the heat issues there...ours is now.
09-05-2011, 11:58 PM
#9
Vibration and noise when one of the bolts backed out and was flopping around inside the TT. Many of the bolts were only finger tight once the tension was removed by the urethane melting away. Loktite was used, but the high temps must have degraded that as well.
09-06-2011, 10:16 AM
#11
Instructor
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Did you check the run out on the shaft assembly prior to installation? I was just wondering if there was excessive binding/runout that may have contributed to the failure.
09-06-2011, 10:27 AM
#12
Instructor
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I noticed in the pictures of the failed components that the metal inserts through the center of the 6 bushings were missing. What happened to these metal inserts? Were they missing prior to installing the prothane guibos? Also did you use a prothane guibo on the front and back of the shaft, or only front or back.
09-08-2011, 06:04 PM
#17
Why are you guys searching for some reason for this failure other than the goddam urethane can't take the heat. It softened and deformed, end of story.
He tried to help the community by posting this in an effort to keep someone else from wasting not only the money spent on the inadequate parts, but the cost of a shortened race weekend.
But jeeeezus, some of you guys...
/rant
He tried to help the community by posting this in an effort to keep someone else from wasting not only the money spent on the inadequate parts, but the cost of a shortened race weekend.
But jeeeezus, some of you guys...
/rant
Last edited by vette6aut0x; 09-08-2011 at 06:09 PM.
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Drift Vette (09-23-2021)
09-08-2011, 07:25 PM
#19
Le Mans Master
Why are you guys searching for some reason for this failure other than the goddam urethane can't take the heat. It softened and deformed, end of story.
He tried to help the community by posting this in an effort to keep someone else from wasting not only the money spent on the inadequate parts, but the cost of a shortened race weekend.
But jeeeezus, some of you guys...
/rant
He tried to help the community by posting this in an effort to keep someone else from wasting not only the money spent on the inadequate parts, but the cost of a shortened race weekend.
But jeeeezus, some of you guys...
/rant
09-08-2011, 07:55 PM
#20
Drifting
Member Since: Jul 2000
Location: Tallahassee Florida
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Why are you guys searching for some reason for this failure other than the goddam urethane can't take the heat. It softened and deformed, end of story.
He tried to help the community by posting this in an effort to keep someone else from wasting not only the money spent on the inadequate parts, but the cost of a shortened race weekend.
But jeeeezus, some of you guys...
/rant
He tried to help the community by posting this in an effort to keep someone else from wasting not only the money spent on the inadequate parts, but the cost of a shortened race weekend.
But jeeeezus, some of you guys...
/rant