Engine vibration at 2200RPM
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Thank you for the info Eric. The vibration is still there past 2000rpm but its not as bad. If the flywheel and balancer are balanced to the crank its self, what would be the solution for this problem? Will i have to pull the whole motor and have it all balanced at a machine shop?
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
It would be worth putting your car up on a hoist and checking the exhaust system to see if it is contacting the body someplace. Check the engine and transmission mounts to see if they have been replaced with junk after market units or if one of them has gone bad.
A first order imbalance will show up in the shifter, not so much anyplace else unless something is causing a powertrain ground out to the body.
A first order imbalance will show up in the shifter, not so much anyplace else unless something is causing a powertrain ground out to the body.
Racer
Joined: Aug 2005
Posts: 465
Likes: 16
If the problem did not exist prior to the clutch swap but surfaced afterward, something in the work performed is likely the culprit.
What pressure plate/flywheel did you install? Did you take it to a shop and have it checked before you installed it?
I bought a flywheel from one manufacturer and a pressure plate from another manufacturer and both were suppose to have been zero balanced, but they weren't. I had them zero balanced together and no vibration issues.
Also, there is a possibility the pilot bearing got bunged up.
What pressure plate/flywheel did you install? Did you take it to a shop and have it checked before you installed it?
I bought a flywheel from one manufacturer and a pressure plate from another manufacturer and both were suppose to have been zero balanced, but they weren't. I had them zero balanced together and no vibration issues.
Also, there is a possibility the pilot bearing got bunged up.
Thread Starter
Drifting
Joined: Sep 1999
Posts: 1,431
Likes: 2
From: Munich Bavaria
I installed an OEM unit from LUK.
Unfortunatelly, prior installation, i did not have the unit balanced at a shop. I should have done that....
Ussually those units should be ballanced from the factory. As you can see on the FW picture a few posts above, there are some balancing holes in the FW - So i thought it was balanced.
Next time i will know better!
I have a M12 here, ready for installation. As soon as the FW/PP/Clutch is out of the car, i will bring it to a shop for balancing. You guys will be the first to know if that solved the problem.
Jochen
Unfortunatelly, prior installation, i did not have the unit balanced at a shop. I should have done that....
Ussually those units should be ballanced from the factory. As you can see on the FW picture a few posts above, there are some balancing holes in the FW - So i thought it was balanced.
Next time i will know better!
I have a M12 here, ready for installation. As soon as the FW/PP/Clutch is out of the car, i will bring it to a shop for balancing. You guys will be the first to know if that solved the problem.
Jochen
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
The flywheel may be balanced but you maybe missing the original added weights used to account for minor engine internal imbalances.
Last edited by Eric D; Nov 22, 2011 at 01:36 PM.
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Drifting
Joined: Sep 2009
Posts: 1,862
Likes: 594
From: Prescott, Arizona
I presume that the original bolts were used on the new pressure plate, but if not, using bolts that do not have a short section of unthreaded shank or smooth shoulder where they go through the pressure plate can allow the pressure plate to be very slightly off center, causing a vibration.
And, of course, the pressure plate itself could be out.
Ideally the flywheel/ presure plate should be balanced together, but few do that.
And, of course, the pressure plate itself could be out.
Ideally the flywheel/ presure plate should be balanced together, but few do that.
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
I presume that the original bolts were used on the new pressure plate, but if not, using bolts that do not have a short section of unthreaded shank or smooth shoulder where they go through the pressure plate can allow the pressure plate to be very slightly off center, causing a vibration.
And, of course, the pressure plate itself could be out.
Ideally the flywheel/ presure plate should be balanced together, but few do that.
And, of course, the pressure plate itself could be out.
Ideally the flywheel/ presure plate should be balanced together, but few do that.
