ls9 clutch confusion
04-23-2012, 01:22 PM
#21
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According to Katech, you have to preheat this flywheel to 200 degrees. You have an aluminum flywheel and steel mounting hardware etc. If it was not preheated it is possible it has been warped slightly. I hope this is not the case, these flywheels are expensive.
04-23-2012, 02:04 PM
#22
If the flywheel is warped, you'd feel significant vibration.
Sorry, I meant 1/16". I disagree and think that we have exactly the same issue. Although this is speculation on my end until verified by experimentation, I think that the specified margin is for thermal expansion and to set the full engagement point of the clutch below the maximum extension of the pedal. Although you're not supposed to rest your foot on the pedal, the combination of margin plus the pedal spring should allow you to keep your foot there without reducing pressure on the friction disc. Having too much margin should result in a "dead" pedal feeling at the top of the pedal's extension (when you let your foot off the clutch) and not enough actuation of the pressure plate fingers when you put the pedal to the floor.
Sorry, I meant 1/16". I disagree and think that we have exactly the same issue. Although this is speculation on my end until verified by experimentation, I think that the specified margin is for thermal expansion and to set the full engagement point of the clutch below the maximum extension of the pedal. Although you're not supposed to rest your foot on the pedal, the combination of margin plus the pedal spring should allow you to keep your foot there without reducing pressure on the friction disc. Having too much margin should result in a "dead" pedal feeling at the top of the pedal's extension (when you let your foot off the clutch) and not enough actuation of the pressure plate fingers when you put the pedal to the floor.
04-23-2012, 03:02 PM
#24
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wow. that sucks. i did not preheat mine. not sure you can blame that.
i guess fortunately I am not having any issues with my LS9x setup. so, I am not going to stress on it.
i guess fortunately I am not having any issues with my LS9x setup. so, I am not going to stress on it.
04-23-2012, 03:21 PM
#25
If the flywheel is warped, you'd feel significant vibration.
Sorry, I meant 1/16". I disagree and think that we have exactly the same issue. Although this is speculation on my end until verified by experimentation, I think that the specified margin is for thermal expansion and to set the full engagement point of the clutch below the maximum extension of the pedal. Although you're not supposed to rest your foot on the pedal, the combination of margin plus the pedal spring should allow you to keep your foot there without reducing pressure on the friction disc. Having too much margin should result in a "dead" pedal feeling at the top of the pedal's extension (when you let your foot off the clutch) and not enough actuation of the pressure plate fingers when you put the pedal to the floor.
Sorry, I meant 1/16". I disagree and think that we have exactly the same issue. Although this is speculation on my end until verified by experimentation, I think that the specified margin is for thermal expansion and to set the full engagement point of the clutch below the maximum extension of the pedal. Although you're not supposed to rest your foot on the pedal, the combination of margin plus the pedal spring should allow you to keep your foot there without reducing pressure on the friction disc. Having too much margin should result in a "dead" pedal feeling at the top of the pedal's extension (when you let your foot off the clutch) and not enough actuation of the pressure plate fingers when you put the pedal to the floor.
So I must be confused by your post. I do not have excessive space between the compressed slave and the pressure plate fingers which would normally cause disengagement issues and require shimming (like i believe your suggesting). instead i am on the edge of have too little, which is understandable because in theory the clutch is already broken in.
This is the next step for me it looks like. I reused the GM bolts so I plan on putting in ARP bolts this time around.
04-23-2012, 03:43 PM
#26
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I thought i had the exact same problem until i measured that distance and was at .10 inches. So i think they are different root causes with similar symptoms.
replaced with a brand new slave at the time of the clutch install so about 1k mikes on it. no fluid or wet spots indicating its leaking.
I didn't originally install it, I had a mechanic install it who done good work for me before so I'm trying to troubleshoot his install. I've never heard of anyone preheated their flywheel before installation.
Another possibility. I believe the disc directly behind the pressure plate is fixed in position, perhaps the one behind it is bent? Are we talking a very obvious bend? something i can visually see?
replaced with a brand new slave at the time of the clutch install so about 1k mikes on it. no fluid or wet spots indicating its leaking.
I didn't originally install it, I had a mechanic install it who done good work for me before so I'm trying to troubleshoot his install. I've never heard of anyone preheated their flywheel before installation.
Another possibility. I believe the disc directly behind the pressure plate is fixed in position, perhaps the one behind it is bent? Are we talking a very obvious bend? something i can visually see?
04-23-2012, 03:53 PM
#27
So I must be confused by your post. I do not have excessive space between the compressed slave and the pressure plate fingers which would normally cause disengagement issues and require shimming (like i believe your suggesting). instead i am on the edge of have too little, which is understandable because in theory the clutch is already broken in.
04-23-2012, 03:53 PM
#28
Sorry you have this problem.
I suggest you check flatness of the flywheel and make absolutely sure it isn't warped.
Pressure plate to, but highly unlikely.
Obviously also check the disc.
I would be concerned if everyone had this problem, but that just isn't the case, so...... MOD HELL.
I suggest you check flatness of the flywheel and make absolutely sure it isn't warped.
Pressure plate to, but highly unlikely.
Obviously also check the disc.
I would be concerned if everyone had this problem, but that just isn't the case, so...... MOD HELL.
04-23-2012, 04:13 PM
#30
Sorry you have this problem.
I suggest you check flatness of the flywheel and make absolutely sure it isn't warped.
Pressure plate to, but highly unlikely.
Obviously also check the disc.
I would be concerned if everyone had this problem, but that just isn't the case, so...... MOD HELL.
I suggest you check flatness of the flywheel and make absolutely sure it isn't warped.
Pressure plate to, but highly unlikely.
Obviously also check the disc.
I would be concerned if everyone had this problem, but that just isn't the case, so...... MOD HELL.
04-23-2012, 07:17 PM
#31
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My ls9 clutch had been pretty great so far. Mine is the lingenfelter with the steel flywheel though.
We have had this issue pop up on the vettes, a tick master solved the problem. I think a new tick for the v would be great Addition.
We have had this issue pop up on the vettes, a tick master solved the problem. I think a new tick for the v would be great Addition.
04-24-2012, 07:13 AM
#33
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I suppose it would be interesting to see if GM used a different master on the ZR1 for that same reason????
Last time I talked with Tick a while ago, they said they were still developing one for the V, I would still offer up my car for fitting purposes for one.
04-27-2012, 12:05 PM
#39
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Well you only had on bolt in the flywheel! That'll do it every time!
In all seriousness, I know how frustrating these clutch issues can be so I hope you find the issue.
In all seriousness, I know how frustrating these clutch issues can be so I hope you find the issue.
04-27-2012, 12:42 PM
#40
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Just thought, it could also be an issue with the captured disk and the pressure plate. Since they can't be inspected it would be almost impossible to tell. May see if you can get them to swap the pressure plate out for a new one.