is some noise normal when clutch is released

[hallslt4]

The throwout bearing seems okay,Jerry Watts says you
would hear a loud pitch if it was out.A dual mass
flywheel is very heavy,how does everybody elses sound
in neutral,and clutch disengaged?

 

[Steel Half-Shafts]

hallslt4,
Mine "rattles" a little at idle. I think it's the "nature of the beast".
The "dual-mass flywheel" transmits the power pulses of the engine and makes some noise, as well as the ZF transmission which "rattles" in neutral.

 

[90SC]

Clutch noise with clutch released

My 90 has some noise as well, had ruled out the throwout bearing. Good to hear this May be common.

 

[95VETTE]

my input bearing is gone. Car in neutral, clutch released you get a high pitched whine. Been like that for 14 years, never got louder. Some day I'll get around to getting it fixed when something else goes wrong that warrants the repair

 

[G Winter]

Did you guys notice that the original thread is from 2001. I have a 90 and a few yrs ago my clutch went out. The cause seems to have been the seal leaking lube from the flywheel causing it to slip and eventually burn the clutch. I replaced the clutch and the flywheel. Before I did this I had a rattle at idle especially warmed up. Afterwards the rattle is gone. After talking to the ZF Doc I found that the flywheels go bad and cause the rattle. Last I heard the flywheels are no longer available and a standard setup has to be use to replace them.

 

[WhalePirot]

Did you guys notice that the original thread is from 2001.

Yes

Last I heard the flywheels are no longer available and a standard setup has to be use to replace them.

There are a few around, but real hard to find.

When Bill (ZFDoc) blueprinted my 'new' ZF6-40, he reshimmed an idler(I think) which eliminated the rattle to below the car exhaust noise. He mentioned, thankfully, some rattly-type noises at low engine RPM, under any acceleration while assuring me that it is just noise and not damaging. I hear it below 2000 and spend a fair amount of time there.

My BMW R1100RS 5-spd. bike also rattles at idle, clutch out.

My setup is semi-custom, dual organic clutch stack, from RAM. I chose the steel flywheel over aluminum flywheel for a few reasons, including a more stable idle RPM and easier launch; all due to the higher mass. Clatter was not really a concern for this car. That mass, I was told, is much closer to the stock 4+3 clutch weight. IF i were in 'need' of a quicker revving engine, I might have chosen aluminum, but my track days, are past; no more breaking parts on this Corvette.