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Old 04-07-2018, 01:32 PM   #183
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I cracked open an lsa to change out the coupler and found it already had a solid coupler. There was no wear on the shaft either. Did the factory start installing solid couplers at some point?


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Old 04-07-2018, 02:07 PM   #184
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First time I have seen one without ant grooves in it. Must have been on there since day one.
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Old 04-07-2018, 03:07 PM   #185
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Originally Posted by PPV View Post


I cracked open an lsa to change out the coupler and found it already had a solid coupler. There was no wear on the shaft either. Did the factory start installing solid couplers at some point?


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2014.
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Old 04-07-2018, 09:31 PM   #186
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Curious, what kind of material is the solid isolator made of? Is it metal of some kind, rubber, or some other semi compliant material?
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Old 04-08-2018, 02:48 AM   #187
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Which part nr is your sc?
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Old 04-08-2018, 06:39 AM   #188
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Curious, what kind of material is the solid isolator made of? Is it metal of some kind, rubber, or some other semi compliant material?
I believe they are resin
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Old 04-08-2018, 09:04 AM   #189
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That pics looks like the LPE solid one I installed in 2014. They since switched the OEM solid version which looks different.
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Old 04-08-2018, 09:40 PM   #190
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2014.
Not all 14's http://www.camaro5.com/forums/showthread.php?t=446799
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Old 04-08-2018, 11:41 PM   #191
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I believe they are resin
I was curious because the way I understood it was explained long ago was that the rotors themselves rattle/vibrate a certain amount during normal operation as they are rotating. The spring loaded isolator was designed to absorb some of that rotor rattle.

IF that's the reason for the spring, then going to a solid (metal of some kind) isolator would cure the isolator spring wearing the grooves in the shaft, but it would then no longer help dampen the rotor lobe rattle and it would be transmitted through the solid pulley to the drive belts/etc. Thus a solid metal isolator might not be the best solution as far as limiting the rotor rattle.

If they (Eaton) modified the isolator to the spring loaded design but now with it packed with grease of some sort to help eliminate the grooving, they would have gone back to allowing the spring to help absorb the rotor rattle.

HOWEVER, if the solid isolator was made out of some compliant material, then the compliant material would act as a rattle absorber by the nature of the compliant materials properties without the need for the spring.
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Old 04-09-2018, 12:28 AM   #192
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The rotors do not inherently rattle. The rattle is a product of the lash between the rotor coupling gears as the experience continuous drive to coast. The spring coupler loads, and unloads in an attempt to silence what would otherwise rattle. The slack in the spring coupler actually caused as many problems as it attempted to fix by facilitating the very same rattle in many units. The groves in the shaft "themselves" are of little consequence, but the shrapnel they make has shown the ability to enter the drive rotor bearing in the front directly behind the coupler.

The solid coupler allowed rattling in several units too, but at least it did not make metal filings. I assume GM or Eaton threw a party when one of their brilliant engineers figured out that a heavy greased spring unit would make better all things. The grease would lubricate making the tension more linear with less wear to the shaft. It would help damp the spring coupler. And, it would catch the shrapnel. YEAH!

Only one small problem... It is not 100%. Hence my car. It turned out to be a greased spring unit. The grease caught all the powder, but had slung outward to create a grease halo of sorts. The accumulation settled at the bottom of the bore until substantial enough to start drifting back. I'm sure operating temps helped this process. The grease actually helped all the metal make its way directly to the rotor bearing. BTW, my pilot shaft looked as bad as any of them at 11k miles. Three dealerships and GM customer service acknowledged my problem, but refused to do anything about it. While you technically void your warranty by having someone helpful repair your car, do not worry....that warranty at worth a squirt of pi$$.
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Old 04-09-2018, 07:49 AM   #193
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I have a '15. So from what I'm reading my '15 should have the solid isolator from GM?
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Old 04-09-2018, 08:15 AM   #194
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I have a '15. So from what I'm reading my '15 should have the solid isolator from GM?
Yes.
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Old 04-09-2018, 09:30 AM   #195
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Originally Posted by scdrj View Post
The rotors do not inherently rattle. The rattle is a product of the lash between the rotor coupling gears as the experience continuous drive to coast. The spring coupler loads, and unloads in an attempt to silence what would otherwise rattle. The slack in the spring coupler actually caused as many problems as it attempted to fix by facilitating the very same rattle in many units. The groves in the shaft "themselves" are of little consequence, but the shrapnel they make has shown the ability to enter the drive rotor bearing in the front directly behind the coupler.

The solid coupler allowed rattling in several units too, but at least it did not make metal filings. I assume GM or Eaton threw a party when one of their brilliant engineers figured out that a heavy greased spring unit would make better all things. The grease would lubricate making the tension more linear with less wear to the shaft. It would help damp the spring coupler. And, it would catch the shrapnel. YEAH!

Only one small problem... It is not 100%. Hence my car. It turned out to be a greased spring unit. The grease caught all the powder, but had slung outward to create a grease halo of sorts. The accumulation settled at the bottom of the bore until substantial enough to start drifting back. I'm sure operating temps helped this process. The grease actually helped all the metal make its way directly to the rotor bearing. BTW, my pilot shaft looked as bad as any of them at 11k miles. Three dealerships and GM customer service acknowledged my problem, but refused to do anything about it. While you technically void your warranty by having someone helpful repair your car, do not worry....that warranty at worth a squirt of pi$$.
I didn't remember the actual cause of the inherent 'rattle', so I simply referred to it as the 'rotor rattle'. Thank you for pointing it out that it's actually the rotor gears and their gear lash that is the source of the 'rattle' that the isolator is trying to minimize before it gets transmitted to the drive belt.
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Old 04-09-2018, 11:23 AM   #196
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I'm not trying to school you as much as I'm trying to point out that the problem has not really been fixed. Not at least at the time my 14' was built. If it has been solved now, GM does not seem to be willing to help me out

BTW, transmitting it to the belt hurts nothing. If nothing else, the belt and tensioner would have the potential to help damp it further.
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