Daemione

I've been searching non-stop on several sites, and can't find this information . . . Does the a 225mm flywheel/clutch combo use the same starter as a 240mm flywheel/clutch? In other words, is it just the friction surface that's a different diameter, or the entire flywheel? What needs to be done to "upgrade" an originally 225mm setup to the 2+2/turbo's 240mm?


I need to replace the clutch on my '79 2 seater, and want to put in a lightweight flywheel while I'm at it . . . problem is, I don't see any lightweight flywheels in the stock 225mm size, so am trying to figure out if there are any headache's involved with just get a 2+2/turbo clutch & flywheel.

Thanks!

snwbrderphat540

there's stock 225mm light weight flywheels out there.

But the flywheel is exactly the same in every dimensions and aspect (the 225 and 240) except in surface friction area. So all you need is a matching clutch for a 240mm flywheel and install. nothing else.

Daemione

Ah - awesome . . . maybe the problem is finding a lightweight flywheel that lists it's dimensions, vs. just a bunch of mostly accurate model years.

Thanks for the quick answer!

Daemione

Oh, and just to confirm some of my other research - with a 240mm surface flywheel, it doesn't matter which clutch (225 or 240) I have, right?


Well, other than the difference in rotational inertia & friction area . . .

BlueKitsune

You have to have the right clutch for the flywheel, else it wont fit. and the right throw out bearing collar too

thxone

Would it not be as simple as going to an auto parts store or parts website and seeing if the starter part number is the same for a turbo or 2+2 as it is for a non turbo, coupe?

BlueKitsune

2+0 N/A = 225mm flywheel
2+2, 2+0 Turbo = 240mm flywheel

Clutches cant be interchanged between the 2 as they wont mount up, you you must have the right T/O Bearing collar for the right clutch.

2+0 N/A = Short collar
2+2, 2+0 Turbo = Long collar
(I might have that backwards on the T/O collar, I'm half asleep.)

You can also use any flywheel/clutch on any L engine with any manual trans starter.

Daemione

So what about the Fidanza flywheel? Part #143281 - it's listed as fitting both n/a & turbo models . . . I would assume both with stock clutches (and their respective t/o bearings)? Or do you have to change to whatever surface area the flywheel is (which Fidanza doesn't list)?




p.s. the search on this site really bites. Use 2 search terms, and it'll bring up every thread with at least one of them - when I would obviously only want threads with both.

NismoPick

Maybe try more specific words. You can also search within threads too... makes it really quick to find what you are searching for.

BlueKitsune

Then they must be talking about the N/A 2+2 as it uses the same flywheel/clutch as a Turbo Z. So its the bigger of the 2 flywheels.

NismoPick

You'd think that Fidanza would have the ACTUAL specs on their website... but they don't.

All the websites selling this flywheel (part# 143281) state:

NISSAN 240Z 1970-1973

NISSAN 260Z 1974-1974

NISSAN 280Z 1975-1978

NISSAN 280ZX 1979-1983

Sounds to me like it's the 225mm non-turbo size.

Heat Rave was using this flywheel & I remember him saying the car "shimmied" on hills at low speeds due to the lightened flywheel. Also, remember that a motor needs mass to keep the rotation going (thus the need for crank counterweights, a weighted front pulley damper, and weighted flywheel). The motor will rev UP faster with less mass, but will also rev DOWN faster.

I would personally save some $$$ and get the stock flywheel lightened up and balanced.

Daemione

I haven't seen the parts in question, so maybe this doesn't make sense - but wouldn't a flywheel with a 240mm surface work with both 240 & 225mm clutches? Fidanza's application guide from their website says "2.8L Inc. T" in the engine section of the 75-83 application. http://www.fidanza.com/files/Fidanza_appguide_2009.xls I found other threads from people who used a turbo clutch with the fidanza, so that's what I went with. Hopefully it works out . . .

I ran a 12 pound flywheel on my Prelude (stock is around 22 pounds) and wished I had gone with an 8 pounder, so I should be happy with this one. I don't trust many mechanics to do that kind of machinework, especially on something like a flywheel where a tiny imbalance would really screw things up.

BlueKitsune

Turbos use the same bigger flywheel and clutch kit as the N/A 2+2. So the turbo is the bigger clutch. You can NOT put a bigger clutch on a smaller flywheel your a smaller clutch on a bigger flywheel. the pegs and bolt holes will NOT line up.

I'm getting tired of repeating myself.

Daemione

Please don't think I'm being obtuse - I'm just seeing a lot of conflicting information out there, and trying to make sense of it all. For example, quite a few people with both Fidanza and Clutchmasters flywheels, most of whom have a 240mm clutch, but others have installed it with a 225mm one.

Both Fidanza and Clutchmasters list their flywheels as being applicable to both 225 & 240mm applications. According to a few threads I've found, it looks like the aftermarket flywheels are drilled for both clutch setups, and studded to be adaptable to either one. One person mentioned having to take it to a machine shop to move the studs into other holes to match his 225mm clutch.

Anyway, replacement clutch kit is due to arrive today, and I'll hopefully get the flywheel in time to swap it all in beginning of next week.

SHADY280

unless your making 400+ hp. id stay with 225mm. less rotating mass, less rotational forces. just my 2 cents

Daemione

Heh, too late . . . 240mm clutch arrived today (<24 hours from when I ordered it, unbelievable). The extra half inch of rotation mass should be made up for in spades by the 18 pound reduction in flywheel weight.

Daemione

Finally got the Fidanza flywheel in a few minutes ago. It does, indeed, have a 240mm face, and the dowels can be moved around to fit different pressure plates. I found a post where it was mentioned he had to bring it to a machine shop to get the dowels moved, but the ones on mine just slide in and out wherever you want them.

So all I'm waiting on now is the tranny jack, new rear main seal, and turbo throwout bearing collar/sleeve (in case it's needed). Oh, I also have an order in with McMaster-Carr for some shorter pressure plate to flywheel bolts, since I found a few accounts where the stock ones were too long.

SHADY280

its actually the head of the flywheel bo9lts are too proud

zstuff

hello I tink arizonazcar has what you need if they still out there

Male

So if i got this right you can use 240mm lightened flywheel as long as you use a 280zx turbo clutch pressure plate and throwout bearing on a 79 transmission(the non turbo tranny that is not a t-5) im putting the 79 5speed tranny on my L28et

The only difference on the 2 flywheels are different thickness right?

NismoPick

See post #2: