lightweight flywheel
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Joined: Jul 2007
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lightweight flywheel
i had a fidanza lightweight flywheel installed along with a new gm clutch and pressure plate at a corvette shop in the new orleans area. the flywheel said it was pre-balanced but i said i didnt believe and he just stuck it on there anyway and now from 4k rpms up my shifter shakes violently. i also have lots of clutch chatter at idle and under 2k rpms especially with the a/c on. any help would be appreciated.
Team Owner
Joined: Aug 2000
Posts: 40,156
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From: San Pedro CA
hm... the fidenza is NOT balanced. It's set to the base balance of the DMFW, not to the match balance your engine needs.
the easiest thing is if you have the old DMFW, remove the fidenza and get it match balanced.
otherwise... yuck.
the easiest thing is if you have the old DMFW, remove the fidenza and get it match balanced.
otherwise... yuck.
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Joined: Jul 2007
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any machine shop can match the balances?
secondly, ive had this flywheel on for about 5 months now and ive ran it at the track and on the street every weekend. would this cause any damage to my engine? if so what kind of damage?
Last edited by grandsport504; Aug 11, 2007 at 04:32 AM.
Burning Brakes
Joined: Sep 2006
Posts: 1,202
Likes: 3
From: MD
Damage is unlikely, but if you ran it a long time that way you might lose your rear main seal prematurely.
I'd look for a good shop to match balance it, but many machine shops are up to the task.
Lastly, the clutch chatter might not go away when you get it balanced. I've heard that switching from the DMFW to a single-mass causes the clutch chatter, even if it's properly balanced.
I'd look for a good shop to match balance it, but many machine shops are up to the task.
Lastly, the clutch chatter might not go away when you get it balanced. I've heard that switching from the DMFW to a single-mass causes the clutch chatter, even if it's properly balanced.
Thread Starter
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Joined: Jul 2007
Posts: 64
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Damage is unlikely, but if you ran it a long time that way you might lose your rear main seal prematurely.
I'd look for a good shop to match balance it, but many machine shops are up to the task.
Lastly, the clutch chatter might not go away when you get it balanced. I've heard that switching from the DMFW to a single-mass causes the clutch chatter, even if it's properly balanced.
I'd look for a good shop to match balance it, but many machine shops are up to the task.
Lastly, the clutch chatter might not go away when you get it balanced. I've heard that switching from the DMFW to a single-mass causes the clutch chatter, even if it's properly balanced.
Burning Brakes
Joined: Nov 2001
Posts: 1,241
Likes: 9
From: Houston TX
those flywheels come with 2 different weights, neither is bolted on. do you know if it was bolted on with/without a weight? one of the 2 weights is actually pretty close to balanced in LTx engine, btw.
that resultant vibration will be more damaging to a cast crank than a steel one. it's very difficult to quantify it, but i'd guess the extra stress it puts on a cast crank is more than 2X the equivalent miles.
-michael
that resultant vibration will be more damaging to a cast crank than a steel one. it's very difficult to quantify it, but i'd guess the extra stress it puts on a cast crank is more than 2X the equivalent miles.
-michael
Thread Starter
Advanced
Joined: Jul 2007
Posts: 64
Likes: 0
those flywheels come with 2 different weights, neither is bolted on. do you know if it was bolted on with/without a weight? one of the 2 weights is actually pretty close to balanced in LTx engine, btw.
that resultant vibration will be more damaging to a cast crank than a steel one. it's very difficult to quantify it, but i'd guess the extra stress it puts on a cast crank is more than 2X the equivalent miles.
-michael
that resultant vibration will be more damaging to a cast crank than a steel one. it's very difficult to quantify it, but i'd guess the extra stress it puts on a cast crank is more than 2X the equivalent miles.
-michael
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