Clutch Replacement Options

jonbills

Membership Secretary
Site Administrator
Yep, for drag racing it may be worth keeping the stock weight but drag racing is extreme - far more extreme that just fast driving.
The physics of accelerating on a drag strip and on the road are the same I’m sure.
 

jonbills

Membership Secretary
Site Administrator
Jon out of interest look at this link (scroll down). It's an article by a very well respected engine tuner David Vizard.

http://www.imps4ever.info/tech/875power.html

I used 6-7k a lot on track and I reckon a Datsun fan is far more powerful than an Imp fan (I've had 2 Imps), their rads are tiny too.
Those numbers for the Imp fan are surprisingly high.
Given that the imp has a tiny radiator, the radiator is poorly positioned and the fan pushes rather than pulls I reckon the Imp fan will be considerably more powerful than the Datsun one.
Does it even have a viscous coupling?
 

AliK

Vehicle Dating Officer
Staff member
Club Member
That is actually a great topic in its own right. Shall we start a new thread and move the discussion over to keep the thread on track?

Mr. Tenno is that possible?
 

jonbills

Membership Secretary
Site Administrator
Well if there’s no one to “debate” it with then I’m finished too [emoji3]
 

yellowz

Club Member
I just loved the bit in the ebay ad 'with gas prices edging towards that $4.00 a gallon mark you need every trick you can get.' That's £2.85............. 0r 63p a litre
 

Woody928

Events Officer
Staff member
Club Member
One member who runs an L28, runs this one and is WAY happy with it ...

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/222862718485

I bought the Fidanza as it came highly recommended by people who build high end engines, had great reviews and has a replaceable surface should it ever need changing. It is a bit lighter than the one above - not been put it on the car yet, so time will tell when I get my engine back in.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/122458092672

If you go stock Nissan clutch then Mr F is your man - in fact, like John Shaft, he is THE man, period!

Disclaimer:
All views expressed are that of a keyboard warrior/geek who has to do a lot of research and collect data before doing anything. It does not in any way represent the views of the club. No animals or members were harmed during the research.

Thanks for the links and all the info, really interesting reading and watching, took me a while to catch up!

You're clearly overestimating my old man status driving a classic car and adding many years onto my age assuming you think I know who John Shaft is! :rofl:

I think we'll have to add that disclaimer to everyones signature on here EXTRA;)

Ps. Sorry for the long reply - but you did ask!! ;)

Lol, I'm never going to complain about getting to complain about getting too much feedback!

My Centreforce 2 clutch was not grabby or heavy to use - it's not a 'puck' plate either. I have no memory of any problems driving 'on the road' including long trips abroad (Spa, Le Mans).

I upgraded to a 240mm when I modified my engine. I installed a standard (Mr F supplied) clutch and it would not take the extra torque - it slipped. Hence buying the Centreforce clutch which was fine.

A lightened (or light) flywheel will absorb less power when accelerating - what is going to be used to spin-up the extra weight of the heavy flywheel? If you tried to spin them with a handle you would notice the difference I'm sure.

Driving technique - the engine 'spins-up' and 'dies-down' faster so it's great for upward gear changes and 'blipping' on downward changes. However I have not experienced a light flywheel on a standard engine so much of the extra responsiveness could be down to the engine characteristics too.

225mm v 240mm - why did Nissan go to 240mm, it must have been to cope with the extra power of the bigger engine?

Weight - I weighed two flywheels (225 and 240) and they were the same (21lbs I think). I had my 240mm flywheel lightened by 4 lbs but the bigger clutch was 4lbs heavier so no overall reduction from my 225 'set-up'. However is was lighter than the standard 240mm 'set-up'.

Thanks for the feedback on the Centreforce 2 clutch, it sounds like a good option (albeit gets some bad press stateside).

This is what I needed to know, long term a 240mm clutch and flywheel will make a lot more sense for my needs I feel. I'll avoid just putting a new stock 225mm clutch in.

From what you've all said I'm convinced that while I'm in there it makes sense to go to a 240mm clutch and also add in the lightened 240mm flywheel. Even if I don't necessarily get the full benefits now then later down the line I will appreciate it when the engine has been made a bit more lively and as suggested in future proofing against my planned modifications.

Clutch options wise I've come across these two:

As recommended by Rob, Centreforce 2
https://zcardepot.com/catalog/produ...clutch-240z-260z-280z-280z.html/category/327/

Exedy Stage 1 Organic. Can anyone advise whether this would fit? I'm very familiar with Exedy organic clutches and really like them. It's the desired 240mm however not listed as a 240z fitment....
https://whiteheadperformance.com/pr...1-organic-clutch-kit-06801a-nissan-300zx-z31/

I'll start a separate thread on Flywheels to keep the two topics separate, thank you all for the input though. Learnt a lot from this EXTRA:D
 

dav118118

Club Member
Woody,
I have a centreforce clutch in my z and whilst the weight of the pedal is a little stiffer there is certainly no drag and it’s also pretty unburstable too, or so I’m told. Luke
 

Woody928

Events Officer
Staff member
Club Member

Cheers Jason, had completely slipped my mind to look to Japan!

I've also seen OS Giken do a clutch/flywheel combo with an Ali cover to save a little bit more weight on that steel one. It's 225mm however I'm sure would meet my demands and would guarantee that everything mated together perfectly. Would certainly solve a lot of headaches and the whole thing only weighs in at 10.7KG.

https://www.rhdjapan.com/os-giken-s...minum-cover-gc10-hr30-c110-c210-s30-s130.html

Possibly the easiest solution? (Definitely not the cheapest though)

Woody,
I have a centreforce clutch in my z and whilst the weight of the pedal is a little stiffer there is certainly no drag and it’s also pretty unburstable too, or so I’m told. Luke

Thanks for the feedback dude, great to hear some 1st hand feedback from someone who's been using theirs!
 
I'd always look to Japan first, then work back from from there :) engineering standards tend to go backwards also.

225>240, 6.25% ish?
 
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AliK

Vehicle Dating Officer
Staff member
Club Member
You're most welcome Mr W!

Even you can't be too young to recall the
the year 2000 remake of the 1971 original ;) ....

754466a59c687dbd0aef2e6fa7ebcb83.jpeg



db5d6af0ec6211cfc2c0eb9c2d8ea550.jpeg
 

Woody928

Events Officer
Staff member
Club Member
I'd always look to Japan first, then work back from from there :) engineering standards tend to go backwards also.

225>240, 6.25% ish?

Haha this is a fair point, I usually just get put off by the shipping/import costs and language barrier. Particularly when compared to my contacts stateside as well. I think the OS Giken option is looking like a winner from everything I've seen now :thumbs:

I think with the right setup the difference will be negligible from what I've read from some of the US threads, so much conflicting info as usual though. Doesn't sound like much when you put it like that though.

Even you can't be too young to recall the
the year 2000 remake of the 1971 original ;) ....

You're still underestimating me here, even being a big film buff and a fan of many older films I only entered this mortal world in 1994 EXTRA;)

I'll add it to the list, it looks like a good laugh!
 
Haha this is a fair point, I usually just get put off by the shipping/import costs and language barrier. Particularly when compared to my contacts stateside as well. I think the OS Giken option is looking like a winner from everything I've seen now :thumbs:

I think with the right setup the difference will be negligible from what I've read from some of the US threads, so much conflicting info as usual though. Doesn't sound like much when you put it like that though.



You're still underestimating me here, even being a big film buff and a fan of many older films I only entered this mortal world in 1994 EXTRA;)

I'll add it to the list, it looks like a good laugh!

I'd email Kameari direct also.
 
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