Describe your free rev
Thread Starter
Instructor
Joined: Feb 2012
Posts: 102
Likes: 2
Describe your free rev
Once in a while when I want a serious launch I end up free-revving the car for a bit, clutch depressed and in-gear. I've noticed it vibrates a lot in this situation. No noticeable vibration under load though, or at least not the same one.
Wondering if this is normal, or a sign of something out of balance like the clutch or the harmonic damper. Can you all tell me if your free revs are shaky or smooth like butter?
Wondering if this is normal, or a sign of something out of balance like the clutch or the harmonic damper. Can you all tell me if your free revs are shaky or smooth like butter?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I can run mine slowly up to redline on my 02 ZO6 without any vibrations. My redline is set to 6850 RPMs
-Have you ever had the clutch changed?
-Is your damper wobbling?
Bill
-Have you ever had the clutch changed?
-Is your damper wobbling?
Bill
Thread Starter
Instructor
Joined: Feb 2012
Posts: 102
Likes: 2
Thanks for the replies all.
To TKDenton -- I should have specified this happens way before the rev limit, 2000 RPM or so on up. Though it gets to be less as the motor spins faster I think. As I say that, it sounds like the damper...
To Bill C -- I believe I have done it with the clutch engaged, but now I will have to go experiment. Also need to have a look at that damper. The car is a couple hours away right now so I can't look but I seem to recall it looked less that stellar last time I swapped out the serp belt.
The motor is at about 99k miles (almost to the century mark) but it does make good oil pressure and all so I believe the bottom end is still in spec. Now that I know the vibration is abnormal, I will look closer at possibile culprits (damper, motor mounts, clutch, torque tube shaft, etc.).
To TKDenton -- I should have specified this happens way before the rev limit, 2000 RPM or so on up. Though it gets to be less as the motor spins faster I think. As I say that, it sounds like the damper...
To Bill C -- I believe I have done it with the clutch engaged, but now I will have to go experiment. Also need to have a look at that damper. The car is a couple hours away right now so I can't look but I seem to recall it looked less that stellar last time I swapped out the serp belt.
The motor is at about 99k miles (almost to the century mark) but it does make good oil pressure and all so I believe the bottom end is still in spec. Now that I know the vibration is abnormal, I will look closer at possibile culprits (damper, motor mounts, clutch, torque tube shaft, etc.).
Last edited by kernelPanicked; Jun 2, 2012 at 07:00 AM. Reason: terminology
Thread Starter
Instructor
Joined: Feb 2012
Posts: 102
Likes: 2
Naw, I'm sad to say...I just drive it a little less for now. I've got my hands full with two jobs right now (gotta make hay while the sun shines!) and I have not had the time & place to tear into it. I have a long list of mods & maintenance to make in the near term, including an underdrive pulley and a fuel filter -- the two things I think most likely to be the culprit here.
Thanks for remembering and asking, though!
Thanks for remembering and asking, though!
