Flywheel guru needed, or Reading porsche Part numbers

[RichHawk]

Is there any way to research the dimensional details of a specific Porsche Part number? Does the Part number it's self tell us something relevent?

How does one go about figuring out what clutch and flywheel might interchange with something else?

Here's the Car, engine and flywheel in question:
1989.5 964 C4 3.6L Turbo. I'm hunting for a flywheel. (In case you have one)

The flywheel originally is a single mass unit. Pelican parts says it should be part number 964-102-239-00-M260 It has a 60-2 ring. and it looks to be a 1.5 year part only.

I found this part number from a fellow member 964 102 239 31 which is a later RS style single mass flywheel with 60-2 ring. It looks the same in the limited pictures, But how can I confirm dimensions or interchangeability?

I'm tired of inferring what I can from clutch disks and pressure plates which has not conclusively led me anywhere.

Any experts?

Thanks,
Richard

[Jetjockey]

I have a single mass flywheel for a 1989.5 964 (964 102 239 0R) that was sold to me as new old stock. It has some surface rust from sitting on a shelf for a long time. I will part with it for $250 shipped anywhere in USA. Not sure what it will fit.

[RichHawk]

Originally Posted by Jetjockey

I have a single mass flywheel for a 1989.5 964 (964 102 239 0R) that was sold to me as new old stock. It has some surface rust from sitting on a shelf for a long time. I will part with it for $250 shipped anywhere in USA. Not sure what it will fit.

Sorry to hear you got stuck with that. I read your post from last year.
I don't think that is what I'm in need of. The one I need has a 60-2 ring on it, and looks something like this.


Richard

[Jetjockey]

The teeth on that wheel look much further apart. It may be because it is a Turbo. Good Luck on your search. BTW the M260 designation is the location in the warehouse where Pelican keeps the flywheel.

[RichHawk]

yep the teeth on that are called a 60-2 wheel. ( I read that phonically as Sixty minus two) because it is 60 equally spaced teeth with two teeth missing.
Richard

[Dan J]

Richard,
What engine do you have? There was no 3.6 turbo from the factory in 89.5 only a n.a. 3.6
The flywheel for a 89.5 C4 3.6 is unique to that car. If someone has added a turbo to that engine then I would think that you would need that flywheel. If the engine is from a 964 turbo that is a completely different piece.
Jet Jockey,
The flywheel you have is from a 3.2 Carerra

[RichHawk]

Originally Posted by Dan J

Richard,
What engine do you have? There was no 3.6 turbo from the factory in 89.5 only a n.a. 3.6
The flywheel for a 89.5 C4 3.6 is unique to that car. If someone has added a turbo to that engine then I would think that you would need that flywheel. If the engine is from a 964 turbo that is a completely different piece.
Jet Jockey,
The flywheel you have is from a 3.2 Carerra

That would explain the add on Fuel management system. I assumed it was to handle the extra boost. It handles the whole turbo setup.

Definitely an 89.5, (Build date of 7-89)
Definitely a C4 (axle shafts to the front wheels)
Definitely a 964 (coil over suspension)

Definitely now has a turbo I think this is the stock 3.6l motor built up and turbo added. I'll confirm..

SO the question remains:
89.5 C4 Flywheel, does anyone have one? 964-102-239-00
Would a 92 RS flywheel work? 964 102 239 31

What makes this 89.5 flywheel different? What did Porsche change in 1990?

Thanks,
Richard

[Dan J]

In 1990 Porsche changed to a "dual mass" flywheel.
The flywheel you need is available our host should be able to get it for you
The part # is 964 102 239 00 The list price is $461

[RichHawk]

Originally Posted by Dan J

In 1990 Porsche changed to a "dual mass" flywheel.

The RS flywheel part number above is a single mass flywheel.

See pics here..
For Sale - 964 Carrera RS Single Mass Flywheel

[Jetjockey]

Richard,
Do you have a flywheel on the car now? If so, what is wrong with it? If you already have a flywheel and you are doing a clutch job then have the thing resurfaced at a good machine shop. They will be able to tell you if it needs to be replaced. I had a flywheel for a 3.2 resurfaced with no problems. There is a Porsche memo floating around that says do not resurface a flywheel. This is because if too much material is removed from the flywheel there may not be enough room for a rubber centered disk to fit between flywheel and pressure plate. If you are installing the noisy spring centered disk then it is not an issue.

[RichHawk]

Nope the original flywheel somehow got lost in the multiple stops this engine and car has been. Hence I'm completely paranoid. I keep poking the people involved to dig around for it. But it's probably easier to buy a different one.

I too have successfully resurfaced my 3.2L flywheel.

Thanks,
Richard

[columbus]

The '89 964 C4 was a 1 year flywheel before the switch to dual mass. The overall shape is similar to the 3.2 flywheel, but with 60-2 timing teeth for the 964 DME. I believe it used the 3.2 rubber centered disc and clutch setup or equivalent. The RS style single mass is a more dished shape and requires a different clutch and extended TOB. I believe I have one of each type in storage. Any of the 3 flywheel types could be used as long as the matching clutch package is used.

[h20cooled7]

Dont mean to hijack post but can any1 identify this pressure plate

[h20cooled7]

its a 240 mm

[billjam]

Just as another data point, I have a drawing of a 964 flywheel from Carrera RS (M64.03 engine).
I am also looking at what options I have regarding which flywheel goes with which pressure plate / engine / gearbox / release bearing, etc.
I was considering building up a library of similar drawings so that I could test fit them on paper, or should I say computer, before committing $$.

I don't believe I'm going where no man has gone before
Surely someone out there has got similiar drawings of other flywheels and presure plates that we could bring together as a common resource.

[DTW_porsche]

bump

[h20cooled7]

that is pretty cool!

[RichHawk]

I really like the idea of a library of flywheel . Clutch discs and pressure plates

Drawings are super (I have two I've drawn up)

I wish we could just tabulate some of the key dimensions, but there are just too many ways things can not work to leave out any of the dimensions.

Where do we begin?

[farfinator]

Single Mass Flywheel Contact: AASCO-Vince 714-758-8500
Clutch Contact: SACHS-Mehmet-734-239-1585

These guys are extremely knowledgeable and helpful and should be able to sort out the particulars.

Helpful links:
Aasco flywheel Page
WebCat 3