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Author: Subject: St170 to Mazda rx8 gearbox.
Pigsy

posted on 3/6/19 at 06:21 PM Reply With Quote
If you were going for a clutch setup on the st170 engine with rx8 box, what setup would you choose?
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big_wasa

posted on 3/6/19 at 07:48 PM Reply With Quote
The Rx8 box shouldn’t make much odds. I was not “telling you of for” using the St170 flywheel. Just giving reasons why nobody else uses it.

If your sticking with the dual mass fly as I’ve said it’s a unique combo and your going have to keep playing until you have worked something out.

If your thinking of changing the flywheel to a solid unit.
Standard 1.8 220mm flywheel and good quality clutch should be ok for a standard carb / injection st.

Standard 2.0 240mm is heavier but will hold more torque.

Turbo, standard 2.0 with Focus Rs clutch.

All of these are tried and tested and I’ve never heard of a standard manufactures flywheel grenadine.
I won’t bother suggesting light weight flywheels as you have already made your feelings clear.

[Edited on 3/6/19 by big_wasa]

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Pigsy

posted on 3/6/19 at 07:51 PM Reply With Quote
I am getting a full 10mm travel with the thrust bearing going against the pressure plate/clutch cover and yet the clutch plate is not releasing. Any ideas why?
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Pigsy

posted on 3/6/19 at 07:52 PM Reply With Quote
I am getting a full 10mm travel with the thrust bearing going against the pressure plate/clutch cover and yet the clutch plate is not releasing. Any ideas why?
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Pigsy

posted on 3/6/19 at 08:00 PM Reply With Quote
Thanks Wasa. I was thinking of the Standard 2.0 240mm with Focus Rs clutch. Is the RS clutch 23 spline? Thats why i used the MGB clutch plate.

What is the depth of the 2.0 240mm flywheel please? With the dual mass fitted and all the "freeplay" removed so the the thrust bearing actually is about 1mm off the cover plate fingers it is pushing in 10mm and its not enough. I fitted the larger master cylinder with an extra 25% push than the MG unit and it will not go to the floor with the RX8 slave cylinder. If the 2.0 240mm is thinner then it has no chance of clearing............ or am i wrong.

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Pigsy

posted on 3/6/19 at 08:04 PM Reply With Quote
Like this?

https://www.ebay.co.uk/itm/Ford-Pinto-Clutch-Kit-Lightened-Flywheel-240mm-23mm-Spline-2-0-Hotrod-Kit-Car/254093726479?hash=item3b292a930f:g:vT8AAOSwNT NcGzlz&frcectupt=true

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Pigsy

posted on 3/6/19 at 08:18 PM Reply With Quote
I noticed this:
https://www.ebay.co.uk/itm/Genuine-Ford-Focus-RS-MK1-Flywheel-2-0-Zetec/123772552969?hash=item1cd16b4709:g:xwkAAOSwN0tc4H0u&frcectupt=true

And this:
https://www.ebay.co.uk/itm/Ford-Escort-Ii-2-0-Rs-3-Piece-Complete-Clutch-Kit-100-Saloon-03-73-02-77/133032868688?hash=item1ef9607b50:g:O0sAAOSwFEpahfM 6

It seems to fit everything going ford wise.

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big_wasa

posted on 3/6/19 at 08:26 PM Reply With Quote
Rs clutch is made by Ap and is the same size as the standard 2.0 it uses the same flywheel and runs in a version of the mtx75 although not identical to the focus / Mondeo casting..

Flywheels drilled for a pinto clutch, the clutch is deeper so no need for the thicker thrust bearing in a T9. Again your adding more variables into the mix.

Have you had a chat with Jonathan who makes some of the Rx8 adapters available. He nearly always recommends a standard flywheel and clutch. He runs a Zetec in his Escort with the Rx8 box and gives it death.

Just ask him what he is using..

I think it will be a standard Zetec flywheel and clutch.

You will only need the Rs Ap clutch if you have a very serious St or forced induction.

[Edited on 3/6/19 by big_wasa]

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big_wasa

posted on 3/6/19 at 08:31 PM Reply With Quote
The Focus Rs flywheel is the same as any 2.0 Zetec by buying an Rs one you are paying the Rs tax for a flywheel that will have had a harder life and got much hotter.

The clutch you have linked to is not a Focus Rs clutch. If you find a genuine Ap Rs clutch your eyes will water lol

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big_wasa

posted on 3/6/19 at 08:33 PM Reply With Quote
I may be able to have a measure at the week end if I get a chance to fit my new flywheel.
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Pigsy

posted on 3/6/19 at 09:31 PM Reply With Quote
Thanks for that Wasa. Re: a chat with Jonathan, is he just on as Jonathan?
A chat would be good. I bought my adapter from a John, I think from Wales.

I noticed the pinto clutch with flywheel and thought a good price. Are they reasonably strong? Im not racing it though the odd burnout would not go amiss.

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big_wasa

posted on 4/6/19 at 05:06 AM Reply With Quote
The pinto fly wheel doesn't fit a zetec / st.

You can have a zetec fly wheel re drilled to take a pinto clutch but your then mixing things up again. The advantage of this in a zetec / t9 is no messing around with thicker thrust bearings and you get more clutch travel more clutch travel.

John has a face book page called Rx8 adapter plates or something similar.

[Edited on 4/6/19 by big_wasa]

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Pigsy

posted on 4/6/19 at 07:03 AM Reply With Quote
Thanks Wasa
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big_wasa

posted on 6/6/19 at 06:52 PM Reply With Quote
https://www.ebay.co.uk/itm/FORD-COUGAR-2-0-MANUAL-1999-FLYWHEEL-AND-STARTER-RING-GEAR-928M6398CB/162791078023?hash=item25e71ab887:g:IPgAAOSwDkVaJ8UD
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Pigsy

posted on 6/6/19 at 08:11 PM Reply With Quote
I removed the complete flywheel today. The Dual mass flywheel is 54mm deep. Quite a lump. Do you happen to have a zetec 2.0/1.8 that I could buy from you? Im in Southampton so postage needs to be added.
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big_wasa

posted on 7/6/19 at 05:01 AM Reply With Quote
Sorry I don't, I flogged all my zetec spares of a few months ago.
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Pigsy

posted on 7/6/19 at 12:48 PM Reply With Quote
I purchased the cougar flywheel thanks. Incidentally the mgb b&beck heavy duty clutch and cover is a bolt on job with the st170 flywheel. no mods needed. Its approx 57mm deep. am i right that thats the same as a pinto clutch cover? The dual mass is 54mm deep.
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big_wasa

posted on 7/6/19 at 01:06 PM Reply With Quote
Nope,

The pinto cover plate is deeper than a Zetec hence why you would need the thicker cct133 thrust bearing in a t9 to make up the difference.

It’s not a bolt on fit to a Zetec 220mm flywheel, it needs redrilling. The clutch plate is also slightly smaller at 215mm.

The debate about a rwd clutch having more travel has gone on for years. Both ways work.

If you now have a 240mm fly I would advise making life easy for your self and use a standard Mondeo / focus 240mm clutch plate and cover. The starter motor is the same. It’s then just a case of adjusting either the slave pushrod length or the pivot point or a little of both.

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Pigsy

posted on 7/6/19 at 01:43 PM Reply With Quote
Thanks for that. I have made a plate about 8cm long with a long slot to take the bolts for the slave and welded it to the slave cylinder where the two attachment “tabs” were. It will give me about 4cm adjustment backwards and forwards. That will help with the thrust bearing to clutch cover alignment. I thought that the plate may have been in back to front, but not so.

Will I need to re-drill the cougar flywheel? Thanks for the tip on the clutch from a mondeo/focus.

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Pigsy

posted on 7/6/19 at 02:04 PM Reply With Quote
Just reread the posts. Drilling not necessary.
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big_wasa

posted on 8/6/19 at 08:42 AM Reply With Quote
Well it’s chucking it down so no car time for me today so I won’t get anything measured.
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Pigsy

posted on 8/6/19 at 11:07 AM Reply With Quote
Same here. I don’t blame you.
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Pigsy

posted on 10/6/19 at 12:08 PM Reply With Quote
What do you think of this?
https://www.ebay.co.uk/itm/For-Ford-Cougar-EC-Coupe-2-0-98-01-2-Piece-Sports-Performance-Clutch-Kit/392203687544?hash=item5b51295678:g:YvMAAOSws0pcKFO S&frcectupt=true
They poke 170 horse and this is a stage 1 kit.

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big_wasa

posted on 10/6/19 at 01:40 PM Reply With Quote
My opinion, you don’t need a sports clutch unless you have forced induction ie turbo or supercharger.

A good quality Oem clutch is more than adequate. Ideally I would look for an Oem motorcraft clutch of a crate engine. There was loads of them kicking about as most wanted the 1.8.

After that, any of the recognisable brands. Sach, Luk, Even the old Qh.

It needs to handle torque, the 2.0 was designed to pull a ton and a half car, five adults and a caravan up and down the hills for at least 100k miles.

Check the specs before spending your cash.

https://www.ebay.co.uk/itm/FORD-MONDEO-Mk1-2-0i-4x4-CLUTCH-KIT-QKT691/223481285583?hash=item340885cbcf:g:ua8AAOSwIM9a~pYQ

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big_wasa

posted on 10/6/19 at 01:43 PM Reply With Quote
This one has all the specs.

Cheap because who fits a clutch to a mk1 Mondeo ?

https://www.ebay.co.uk/itm/FORD-MONDEO-2-0I-16V-4x4-2-piece-clutch-kit-1994-1996-QKT1613AF/181997397557?hash=item2a5fe3e635:g:7NwAAOSwoydWniLv

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