Is Driving with a "Knocking Flywheel" OK?
07-10-2011, 10:51 AM
#1
Instructor
Thread Starter
Is Driving with a "Knocking Flywheel" OK?
I believe I have a knocking flywheel and I was wondering if there is any harm that is going to come to anything, other than the annoying noise at idle by doing this? Is the flywheel in danger of totally coming apart, or is it just some slopiness on the internals of the flywheel? Thanks!
07-10-2011, 11:03 AM
#2
Pro
I believe I have a knocking flywheel and I was wondering if there is any harm that is going to come to anything, other than the annoying noise at idle by doing this? Is the flywheel in danger of totally coming apart, or is it just some slopiness on the internals of the flywheel? Thanks!
07-10-2011, 02:12 PM
#3
Burning Brakes
The dual mass flywheel gets too much play in it. That is what is causing the noise..... Don't know if would come apart, but i certainly wouldn't drive it knowing there is a part spinning thousands of rpms right under my legs with a bunch of teeth on it...would you????
07-10-2011, 02:14 PM
#4
Melting Slicks
Member Since: Sep 2008
Location: Cherokee National Forest TN
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A half hearted or full miss fire @ idle will cause the flywheel to rattle. Check compression, insure the tune is good & test the injectors. A fresh set of Bosch 3's from Jon @ FIC eliminated the flywheel rattle @ idle on my 90.
07-10-2011, 02:27 PM
#5
Instructor
Thread Starter
Hmmm...funny that you mention injectors. I just replaced my TPI with a Miniram and just used the SVO parts (24 lb/hr) that were on there. Maybe I should swap back to my "known good" injectors, although it does make the "death rattle" sound when the engine shuts off.
07-10-2011, 02:33 PM
#6
Race Director
You didn't mention and/or confirm if you're running a DMF. If so, rattling is not a death sentence (like some here would lead you to believe). If it rattles the most on shut-down, that's not an issue. If it rattles while at a stop light, you either have a miss or someone converted to a SMF.
The only thing that will cause DMF failure is a compromised seal -- according to the expert, Bill Boudreau. It does not hurt the motor to continue running a DMF with weak springs.
If other things contribute to rattle (like the need for a tune-up, bad injectors, etc..., consider repairing that to minimize annoyance and rattle).
If you have an automatic or non-ZF transmission, ignore this post. You're car is about to EXPLODE!
The only thing that will cause DMF failure is a compromised seal -- according to the expert, Bill Boudreau. It does not hurt the motor to continue running a DMF with weak springs.
If other things contribute to rattle (like the need for a tune-up, bad injectors, etc..., consider repairing that to minimize annoyance and rattle).
If you have an automatic or non-ZF transmission, ignore this post. You're car is about to EXPLODE!
07-10-2011, 04:23 PM
#8
Instructor
Thread Starter
You didn't mention and/or confirm if you're running a DMF. If so, rattling is not a death sentence (like some here would lead you to believe). If it rattles the most on shut-down, that's not an issue. If it rattles while at a stop light, you either have a miss or someone converted to a SMF.
The only thing that will cause DMF failure is a compromised seal -- according to the expert, Bill Boudreau. It does not hurt the motor to continue running a DMF with weak springs.
If other things contribute to rattle (like the need for a tune-up, bad injectors, etc..., consider repairing that to minimize annoyance and rattle).
If you have an automatic or non-ZF transmission, ignore this post. You're car is about to EXPLODE!
The only thing that will cause DMF failure is a compromised seal -- according to the expert, Bill Boudreau. It does not hurt the motor to continue running a DMF with weak springs.
If other things contribute to rattle (like the need for a tune-up, bad injectors, etc..., consider repairing that to minimize annoyance and rattle).
If you have an automatic or non-ZF transmission, ignore this post. You're car is about to EXPLODE!
The fact that I just put the miniram on without changing the tune on the computer might be a contributor. The rattle totally goes away at anything above 1100 rpm.
--Calvin
07-10-2011, 10:43 PM
#9
Drifting
I drove my '89 around for almost a year with the "knocking flywheel" while I tried to decide whether to go back to DM or go SM. No issues at all, other than the annoying 'clunking' sound whenever I would shut the car off. But there's an easy solution to that: shut the car down with the clutch depressed. No noise.
07-21-2011, 08:52 AM
#10
Intermediate
Member Since: Mar 2011
Location: Bowling Green Kentucky
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My flywheel was making the same annoying noise at idle. I decided to change to a SM from SPEC with a stage 1 clutch. My car definitely has a miss, as I need to change injectors (which is next on my list). In any event, is there a market for a used DM flywheel and clutch with only 40K on the car?
