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aus+uk / uk.rec.cars.maintenance / Re: DMF or solid flywheel?

SubjectAuthor
* DMF or solid flywheel?Dogous
`* Re: DMF or solid flywheel?steve robinson
 `* Re: DMF or solid flywheel?Fredxx
  `- Re: DMF or solid flywheel?Dogous

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DMF or solid flywheel?

<shq5n7$2qh$1@dont-email.me>

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From: dogo...@mail.com (Dogous)
Newsgroups: uk.rec.cars.maintenance
Subject: DMF or solid flywheel?
Date: Tue, 14 Sep 2021 13:48:39 +0100
Organization: A noiseless patient Spider
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 by: Dogous - Tue, 14 Sep 2021 12:48 UTC

2008 Golf 5 1.9tdi
150K
making a funny noise at idle
DMF suspected

Is replacing it urgent or could it be left for 20K miles?

Is it worth paying extra for a DMF or would a cheaper solid flywheel be
fine?

Re: DMF or solid flywheel?

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From: ste...@colevalleyinteriors.co.uk (steve robinson)
Newsgroups: uk.rec.cars.maintenance
Subject: Re: DMF or solid flywheel?
Date: Tue, 14 Sep 2021 20:46:52 +0100
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 by: steve robinson - Tue, 14 Sep 2021 19:46 UTC

On Tue, 14 Sep 2021 13:48:39 +0100, Dogous <dogolog@mail.com> wrote:

>2008 Golf 5 1.9tdi
>150K
>making a funny noise at idle
>DMF suspected
>
>Is replacing it urgent or could it be left for 20K miles?
>
>Is it worth paying extra for a DMF or would a cheaper solid flywheel be
>fine?

I would stick to the DMF engines not designed for a solid flywheel

Re: DMF or solid flywheel?

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From: fre...@nospam.co.uk (Fredxx)
Newsgroups: uk.rec.cars.maintenance
Subject: Re: DMF or solid flywheel?
Date: Wed, 15 Sep 2021 00:37:37 +0100
Organization: A noiseless patient Spider
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 by: Fredxx - Tue, 14 Sep 2021 23:37 UTC

On 14/09/2021 20:46, steve robinson wrote:
> On Tue, 14 Sep 2021 13:48:39 +0100, Dogous <dogolog@mail.com> wrote:
>
>> 2008 Golf 5 1.9tdi
>> 150K
>> making a funny noise at idle
>> DMF suspected
>>
>> Is replacing it urgent or could it be left for 20K miles?
>>
>> Is it worth paying extra for a DMF or would a cheaper solid flywheel be
>> fine?
>
> I would stick to the DMF engines not designed for a solid flywheel

I concur. There are a few issues with a solid flywheel:

1) Gearboxes are built to cost, and suffer from the power drive impulses
from an engine with solid flywheel. DMFs smooth out drive from your 4 or
so cylinders.

2) The directly coupled flywheel in a DMF is lighter, and so crank
vibration modes are higher in frequency. Using a solid flywheel,
resonances will occur at lower engine revs and less likely to be
absorbed, depending on the design of the DMF.

My conclusion some time ago was to replace like with like.

Re: DMF or solid flywheel?

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From: dogo...@mail.com (Dogous)
Newsgroups: uk.rec.cars.maintenance
Subject: Re: DMF or solid flywheel?
Date: Sat, 25 Sep 2021 13:34:40 +0100
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 by: Dogous - Sat, 25 Sep 2021 12:34 UTC

On 15/09/2021 00:37, Fredxx wrote:
> On 14/09/2021 20:46, steve robinson wrote:
>> On Tue, 14 Sep 2021 13:48:39 +0100, Dogous <dogolog@mail.com> wrote:
>>
>>> 2008 Golf 5 1.9tdi
>>> 150K
>>> making a funny noise at idle
>>> DMF suspected
>>>
>>> Is replacing it urgent or could it be left for 20K miles?
>>>
>>> Is it worth paying extra for a DMF or would a cheaper solid flywheel be
>>> fine?
>>
>> I would stick to the DMF engines not designed for a solid flywheel
>
> I concur. There are a few issues with a solid flywheel:
>
> 1) Gearboxes are built to cost, and suffer from the power drive impulses
> from an engine with solid flywheel. DMFs smooth out drive from your 4 or
> so cylinders.
>
> 2) The directly coupled flywheel in a DMF is lighter, and so crank
> vibration modes are higher in frequency. Using a solid flywheel,
> resonances will occur at lower engine revs and less likely to be
> absorbed, depending on the design of the DMF.
>
> My conclusion some time ago was to replace like with like.
>
>
Was looking at solid but intending to go with DMF now.
Thanks to you both.

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