C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Why does single mass flywheel = noise?

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Old Apr 21, 2003 | 12:58 AM
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Default Why does single mass flywheel = noise?

I hear it all the time from people on here that they are noisey. When? My 4+3 came with a 16lb single mass flywheel and its silent at idle.

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Old Apr 21, 2003 | 01:56 AM
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Default Re: Why does single mass flywheel = noise? (scorp508)

It isn't the clutch/flywheel that's noisy, it's the ZF-6 transmission. When idling in neutral, the engine firing pulses make the countershaft gears rattle. Especially if you have the early 89-90 ones with the straighter cut gears.

The dual-mass is sprung between the two flywheels: so the engine side accelerates/decelerates absorbing the shocks while the tranny side spins smoothly.
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Old Apr 21, 2003 | 02:11 AM
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Default Re: Why does single mass flywheel = noise? (gcrouse)

It isn't the clutch/flywheel that's noisy, it's the ZF-6 transmission. When idling in neutral, the engine firing pulses make the countershaft gears rattle. Especially if you have the early 89-90 ones with the straighter cut gears.

The dual-mass is sprung between the two flywheels: so the engine side accelerates/decelerates absorbing the shocks while the tranny side spins smoothly.
Yep, it has to do with the distance between the idler shaft ont he trans and the counter shaft....the farther apart they are, the more prone they are to rattling (the same rotational movement results in more linear movement at the gear to gear interface). The dual mass flywheel, as gcrouse said, basically has a vibration dampener in it. This is also why many machine shops are very hesitant to turn DM FWs.
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Old Apr 21, 2003 | 02:20 AM
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Default Re: Why does single mass flywheel = noise? (gcrouse)

Although not related to the original question, didn't ZF change the gear angle in the transmissions in the middle of the Corvette production year (likely early) for '93? That's what my ZF S6-40 Spare Parts Catalog implies...
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Old Apr 21, 2003 | 02:24 AM
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Default Re: Why does single mass flywheel = noise? (gcrouse)

Especially if you have the early 89-90 ones with the straighter cut gears.
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