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From: J�r�my on 13 May 2010 10:53
What are the advantages and disadvantages of dry clutches vs. wet clutches
for bikes? I've just noticed that my RT has a dry clutch, but the K1300GT
has a wet clutch.

I'd hazard a guess that a wet clutch is more resistant to heat damage from
slipping, and a dry clutch allows longer service intervals because of
reduced oil contamination, but why would a manufacturer use different ones
on bikes with approximately the same purpose?

--
Jeremy
R1200RT
From: Grimly Curmudgeon on 13 May 2010 12:05
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "J�r�my" <a(a)b.com> saying something
like:

>What are the advantages and disadvantages of dry clutches vs. wet clutches
>for bikes? I've just noticed that my RT has a dry clutch, but the K1300GT
>has a wet clutch.
>
>I'd hazard a guess that a wet clutch is more resistant to heat damage from
>slipping, and a dry clutch allows longer service intervals because of
>reduced oil contamination, but why would a manufacturer use different ones
>on bikes with approximately the same purpose?

Wet clutches are compact and can be made to handle quite reasonable
amounts of power for their size - it's all about the frictional area and
clamping force that dictates the slipping point. The cooling of the oil
helps considerably and when the clutch is fully engaged the oil no
longer functions as a lube.
Single-plate dry clutches are ok up to a certain point but to handle
serious amounts of power they have to get bigger and unwieldy or use an
intolerable amount of spring pressure - through a bar lever. Multi-plate
dry clutches tend to rattle like buggery and don't have any cooling -
worse, they get too hot internally.
From: Mike Buckley on 13 May 2010 13:47
In message <ch8ou51dt8io3js1abschs9f4isainu9vq(a)4ax.com>, Grimly
Curmudgeon <grimly4REMOVE(a)REMOVEgmail.com> writes
>We were somewhere around Barstow, on the edge of the desert, when the
>drugs began to take hold. I remember "J�r�my" <a(a)b.com> saying something
>like:
>
>>What are the advantages and disadvantages of dry clutches vs. wet clutches
>>for bikes? I've just noticed that my RT has a dry clutch, but the K1300GT
>>has a wet clutch.
>>
>>I'd hazard a guess that a wet clutch is more resistant to heat damage from
>>slipping, and a dry clutch allows longer service intervals because of
>>reduced oil contamination, but why would a manufacturer use different ones
>>on bikes with approximately the same purpose?
>
>Wet clutches are compact and can be made to handle quite reasonable
>amounts of power for their size - it's all about the frictional area and
>clamping force that dictates the slipping point. The cooling of the oil
>helps considerably and when the clutch is fully engaged the oil no
>longer functions as a lube.

Makes me wonder why cars don't have wet clutches. Even high performance
cars have dry clutches? Anybody know if any cars past or present have
experimented?


--
Mike Buckley
RD350LC2
XJ900S
From: Grimly Curmudgeon on 13 May 2010 15:29
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Mike Buckley <Mike(a)hotmail.com>
saying something like:

>Makes me wonder why cars don't have wet clutches. Even high performance
>cars have dry clutches?

They've got a large bellhousing. Practically, the Beemer bike clutch is
as big as you could go on a bike. Car clutches can have really heavy
springs on them, which is mitigated by the pedal leverage and in extreme
cases, a hydraulic servo.
From: J�r�my on 13 May 2010 15:44
Grimly Curmudgeon <grimly4REMOVE(a)REMOVEgmail.com> wrote in
news:ch8ou51dt8io3js1abschs9f4isainu9vq(a)4ax.com:

> We were somewhere around Barstow, on the edge of the desert, when the
> drugs began to take hold. I remember "J�r�my" <a(a)b.com> saying
> something like:
>
>>What are the advantages and disadvantages of dry clutches vs. wet
>>clutches for bikes? I've just noticed that my RT has a dry clutch, but
>>the K1300GT has a wet clutch.
>>
>>I'd hazard a guess that a wet clutch is more resistant to heat damage
>>from slipping, and a dry clutch allows longer service intervals
>>because of reduced oil contamination, but why would a manufacturer use
>>different ones on bikes with approximately the same purpose?
>
> Wet clutches are compact and can be made to handle quite reasonable
> amounts of power for their size - it's all about the frictional area
> and clamping force that dictates the slipping point. The cooling of
> the oil helps considerably and when the clutch is fully engaged the
> oil no longer functions as a lube.
> Single-plate dry clutches are ok up to a certain point but to handle
> serious amounts of power they have to get bigger and unwieldy or use
> an intolerable amount of spring pressure - through a bar lever.
> Multi-plate dry clutches tend to rattle like buggery and don't have
> any cooling - worse, they get too hot internally.

So why would you ever use a dry clutch?

--
Jeremy
R1200RT
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