clutch

Jeff · Post by **Jeff** » Sun Jul 18, 2004 7:15 pm

clutchYep, the clutch and flywheel can be swapped as a package. Don't forget
to do the various bearings and seals while you're in there too.

PS - my stock 130k 1.8 clutch was barely slipping at ~180rwhp, so they're
plenty strong.

dougr · Post by **dougr** » Mon Jul 19, 2004 4:44 pm

Hi All,

I have recently discovered my 1989 (blue) has the dreaded short nose crank
problem. Fortunately I happen to have a spare engine sitting in the garage
at home ( thanks Don of 1.6 to 1.8 fame). Before dropping in the newer
engine, I thought it is a good time to change the clutch. I've read that the
1.8 clutch is interchangeable with the 1.6. Investigating this, I have
dicovered that the 1.6 clutch has a diameter of 200mm and the 1.8 clutch has
a diameter of 215mm. Am I missing something or do I need a 1.8 flywheel as
well?

Thanks in anticipation.
Doug

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From k.jones@auckland.ac.nz Fri Apr 27 18:23:06 2007
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Subject: RE: clutch
Date: Mon, 19 Jul 2004 16:59:06 +1200
Thread-Topic: clutch
thread-index: AcRtS82rV05bDFKXRE+Ae599CcirDAAAE1Pw
From: "Keith Jones" <k.jones@auckland.ac.nz>
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Message-ID: <s0HP.A.uTG.ApZMGB@L733>

Hi Doug.

Yes, you will have to change the flywheel as well if you want to go to
an 1800 clutch.
However, unless you are intending to put some serious power through the
clutch there does not seem to be any advantage of going to the 1800
clutch/flywheel.
My car is putting over 180bhp through an (uprated) 1600 clutch under
race conditions without any problem.
The 1800 flywheel is also a couple of pounds heavier so unless you are
increasing the power you will only reduce your engine response.

Cheers

Keith

________________________________

From: e-admin@mx5club.org.nz [mailto:e-admin@mx5club.org.nz] On Behalf
Of Doug Rashleigh(medlab)
Sent: Monday, 19 July 2004 4:44
To: 'mx5list@mx5club.org.nz'
Subject: clutch

Hi All,

I have recently discovered my 1989 (blue) has the dreaded short nose
crank problem. Fortunately I happen to have a spare engine sitting in
the garage at home ( thanks Don of 1.6 to 1.8 fame). Before dropping in
the newer engine, I thought it is a good time to change the clutch. I've
read that the 1.8 clutch is interchangeable with the 1.6. Investigating
this, I have dicovered that the 1.6 clutch has a diameter of 200mm and
the 1.8 clutch has a diameter of 215mm. Am I missing something or do I
need a 1.8 flywheel as well?

Thanks in anticipation.
Doug

Notice of Legal Status and Confidential Information: This electronic
mail message and any accompanying attachments may contain information
that is privileged and CONFIDENTIAL. If you are not the intended
recipient you are advised that any use, review, dissemination,
distribution or reproduction of the information is strictly prohibited
and may be unlawful. If you have received this document in error, please
notify the sender immediately and destroy the message. From 31st May
2004, all Bay of Plenty District Health board grounds, buildings and
vehicles will be smokefree. Anyone wishing to smoke after 31st May will
need to go outside the BOPDHB boundaries and gateways to do so.

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dougr · Post by **dougr** » Tue Jul 20, 2004 10:33 am

Thanks All,

I've decided to stay with the 1.6 clutch as I won't be putting serious power
through. Well, not in the short term anyway. Is it worth getting the
flywheel lightened, and does anyone whow where I could get it done in
Tauranga?

Cheers
Doug

Mikkels · Post by **Mikkels** » Tue Jul 20, 2004 5:54 pm

Hi Doug

I had the 1.8 flywheel lightened when I did the conversion. Do not have a
before and after analysis however the physics says it should be better. No
more power but less mass to accelerate. A guy in Hamilton did mine for $90
including balancing.

Don

_____

From: e-admin@mx5club.org.nz [mailto:e-admin@mx5club.org.nz] On Behalf Of
Doug Rashleigh(medlab)
Sent: Tuesday, 20 July 2004 10:34 a.m.
To: 'MX5List'
Subject: RE: clutch

Thanks All,

I've decided to stay with the 1.6 clutch as I won't be putting serious power
through. Well, not in the short term anyway. Is it worth getting the
flywheel lightened, and does anyone whow where I could get it done in
Tauranga?

Cheers

Doug

Alan Fisher · Post by **Alan Fisher** » Tue Jul 20, 2004 6:04 pm

Hi Don

I am thinking of having my 1.8 flywheel lightened when I replace the clutch
- do you have any idea how much the guy managed to get off yours and where
he took it off?

cheers

Alan

[...]

Alan Fisher · Post by **Alan Fisher** » Tue Jul 20, 2004 6:35 pm

Hi Don

I am thinking of having my 1.8 flywheel lightened when I replace the clutch
- do you have any idea how much the guy managed to get off yours and where
he took it off?

cheers

Alan

[...]

SLYDIT · Post by **SLYDIT** » Tue Jul 20, 2004 7:25 pm

I had my flywheel lightened and they took a ring of
material off the rear outer edge of the wheel,approx
12mmx12mm this wont weaken the flywheel as a full face
skim will. With this "ring" removed it shaves off
around 900 grams form the flywheel, which doesnt sound
much, but its from the outer edge so it makes a big
difference.
Regal automotive in Tauranga might do it.

Lou Girardin · Post by **Lou Girardin** » Tue Jul 20, 2004 9:46 pm

You lighten a cast flywheel at your own risk. 900 grams won't make a
worthwhile difference compared to a light steel flywheel that's 4 kilos less
than stock.

Mikkels · Post by **Mikkels** » Tue Jul 20, 2004 9:54 pm

Hi Alan

I should have weighed the flywheel beforehand but did not.
There is a web on the engine side of the flywheel which was
removed. I think he reckoned about a kilo of metal came
off. Engine still idles smoothly and runs well.

Don at Autoway recommended the guy to me and he was on the
same street as Autoway.

Sorry I should be more scientific (I am a scinetist but that
is work this is play)

Don

[...]

Jeff · Post by **Jeff** » Thu Jul 22, 2004 7:23 pm

...or you can get a chromoly flywheel from an outfit in Albany ... ~$450

Jeff · Post by **Jeff** » Fri Jul 23, 2004 12:25 am

Euan, there's a small turbo hanging off it ! (shhh) Not dyno'd, but it was
doing 160.x km/h at the end of Meremere... plugged the figure into one of
those Dragstrip calculator thingies.

Chromoly flywheel ... Talk to Paul at Advanced Imports or GLenn at Rotary
Power, they know the place.

Alan Fisher · Post by **Alan Fisher** » Fri Jul 23, 2004 3:59 pm

I have just found a site in Canada that sells lightened stock flywheels on
an exchange basis so I guess it is not too risky.

http://www.perfrmplus.com/miata/asp/default.asp

They also sell loads of other tasty aftermarket MX5 parts - not sure if they
will ship over here but good for browsing and getting ideas...

[...]

Euen · Post by **Euen** » Fri Jul 23, 2004 5:16 pm

Or if you are really serious you could check out the light weight aluminium
flywheels from brperformance in the States. Only USD459.

http://www.brperformance.com/Merchant2/merchant.mvc?

Lots of other nice looking performance bits in their catalogue as well.

Cheers
Euen

Fletch · Post by **Fletch** » Fri Jul 23, 2004 7:07 pm

I'm not sure I'd bother importing a stock lightened one... anyone with a
lathe can do it...

Balancing Services in New Lynn lightened my flywheel and balanced all the
internal parts of my engine for about $250 (a few years ago)... at the same
time, another club member had a flywheel lightened and balanced by them for
about $40 or so, if I remember correctly?

Fletch.

Alan Fisher · Post by **Alan Fisher** » Fri Jul 23, 2004 7:23 pm

sounds like a sensible option..

do you have a name of the company in albany that sells them?

cheers

[...]

Euen · Post by **Euen** » Fri Jul 23, 2004 7:27 pm

Thanks Jeff, do you remember who the outfit was.

Re comment earlier about getting 180rwhp from yours. Obviously a bit more
than a cold air intake and trick exhaust. Can you tell us what you've done
to achieve that.

Cheers
Euen

Alan Fisher · Post by **Alan Fisher** » Fri Jul 23, 2004 8:16 pm

It was more of a case of having had sensible sounding but conflicting
reports as to whether it is a good idea or not and finding the co. in Canada
(with far harsher liability laws!!) that sells them was reasuring!

Its good to hear you have had a positive experience in this area too - any
idea how much they got off it and was it enough to make a noticable
difference?

Many thanks for all contributions on this topic - the experience of others
is much better than learning the hard way...

[...]

VIKING RACING · Post by **VIKING RACING** » Sun Jul 25, 2004 8:30 am

What time did you get at Meremere?
I think I will give mine a try on the dyno (if I find a locost one here in
S.Auck.)
Hmmm small Turbo, as I remember yours is double the size as mine!(we are
still talking turbo:)
The blue One has been sitting in the garage since the Christmas run, while I
have been collecting more bits.
Maybe I have it ready for this christmas run

John J.

Fletch · Post by **Fletch** » Sun Jul 25, 2004 10:50 pm

I believe they removed about 1.5kg or so? This is from a 1.6 which is
already slightly lighter than a 1.8...

Like others have reported, only the ring on the rear outer edge was
removed... no attempt was made to thin the most of the disk, or drill
lightening holes... both of which are not a good idea with a cast iron
flywheel... they can shatter!

It makes no noticeable difference to in-gear acceleration...(to me. I've
heard others report differently)
It makes a reasonable difference to the speed the engine changes speed in
neutral... during gear changes, etc. ie. It makes rev matching easier and
faster...
It also reduces the jarring effect, if you do mis-match the revs during a
shift.

It also has drawbacks... it makes the car easier to stall when starting from
a stop (especially for someone unfamiliar with your car, not so bad with
practise/familiarity) and to a lesser degree, in stop-start Auckland
rush-hour...
And it also makes a strange wizzing noise during deceleration... I'm used
to it, but its noticeable enough that passengers ask what it is... From the
sound, you might think your gear-box or diff is on the way out... but its
been making the sound and working fine for over 70,000km...

Fletch.

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