Porsche 930 Clutch/Flywheel Fitment

[Ron Earp]

Have a look at the photos below with my Ford SB 930 flywheel and pressure plate.

Is the pressure plate supposed to fit inside the flywheel?

There is a ledge machined into the lip of the flywheel. Looks like it is there to receive something. However, the pressure plate is too large to fit into the recess on the flywheel.

Is the pressure plate supposed to just mount up on the upper flange of the flywheel as shown in the lower picture? If this is the way they are to be that is cool, just wanting to make sure as I've never dealt with this sort of setup before.

Odd contraption this Porsche setup. I bet putting the gear box on with the pull type release bearing is going to be a lot of fun!

[Ron Earp]

Hmmm, something doesn't seem right.

If I insert the clutch disk inbetween the pressure plate and the flywheel, the flywheel and pressure plate surfaces mate up perfectly and the disc is free to move around about 1/4" up and down. So the disc isn't going to be clamped in this setup near as I can tell....

Also checked the bolts supplied with the KED parts and they are not long enough to go through the ring gear, pressure plate, and engage the flywheel. Look to be about 1/4-1/2" short.

I must be doing something wrong or that pressure plate is supposed to sit down into the flywheel. To do that however the pressure plate will have to be machined to do the job or a new flywheel made. Anyone else fooled around with the 930/SB Ford pieces?

[Jac Mac]

Sure you have not got the alloy ring back to front? Only a guess on my part!

[flatchat(Chris)]

Ron, the pressure plate should be equivalent to part # 950 116 023 50
Your location register diameter is too big on your pressure plate -- it could be machined down to fit --as long as it will all fit inside the bell housing
Should look like this --- with a 930 release bearing .

[Ron Earp]

Originally Posted by flatchat

Your location register diameter is too big on your pressure plate -- it could be machined down to fit --as long as it will all fit inside the bell housing
Should look like this --- with a 930 release bearing .

I just passed through the garage from cleaning up outside and thought the same thing you posted - will it even fit? I measured the stack of parts - pressure plate, clutch, flywheel at 4.5 inches. The bellhousing is barely 3.5 inches from the front to the inside where there are bulkheads and stuff in there - doesn't appear to me that it would even fit in the housing.

[Big-Foot]

Hi Ron,

Scroll to the bottom of this page on my website and you'll see what I ended up with...

GT-Forty.com

There is a step on the KEP Pressure plate that fits down inside the flywheel. I suspect that you have the same flywheel from Chris as I do...

[Ron Earp]

Randy, so I have the wrong flywheel or wrong pressure plate? I wonder if KED mis-machined it? What did you do to yours to make it fit?

The flywheel is within a few thousands of being the same size as the pressure plate. So I don't know if there is enough meat to machine on the pressure plate so it'll fit inside the flywheel. Also not sure if it can all go in even if recessed.

[Big-Foot]

Ron,

Not sure which is mis-matched where or if all...

I bought my pressure plate off a guy on eBay and it came out of an 89 911.

If you look at this picture, it appears that there is a bigger ledge/step on the pressure plate than what you have. I'll try to get some measurements for you tonight.

[Ron Earp]

I'll catch up with Fran and KED about it. I suspect that KED has sent the wrong piece, that would be 100% in line with every other experience I've had with KED.

[Big-Foot]

The fit between the pressure plate housing and flywheel are very close - if not a slight interference fit..

Good luck getting KEP to respond to your questions if emailed - and I never did get them to return a phone call...

[dave harris]

Ron, I went thru the same issues that you are seeing - you have the wrong combination of parts or flywheel is machined wrong - the pressure plate does fit down into that releif. make sure that you have all of the right porsche parts - I can look up the correct ones if you need - but the #'s are at home.

DON'T start machining on the clutch parts - - - -

As for alignment - yes it can be a bugger - - ask around any of the smaller automotive repair shops for porsche and see if they will lend you an old input shaft from a transmission - any good shop will have "saved" one for this purpose - if you get one, then the alignment is a snap.

Dave

[Big-Foot]

OKay - Been down with a bloody sinus infection for closed to a week now. I'm finally feeling better (good drugs!) and made it out to the shop and took apart my Clutch / Pressure plate / Flywheel assembly for pics and measurements.

My Clutch is pretty much a standard issue 240mm disk.

The Pressure plate / flywheel when assembled are 4" thick from the face that mounts up against the crankshaft and the top surface of the pressure plate itself. Not sure if my combination would work inside your housing either if it's as shallow as you say..

NOTE This is all bolted together and torqued in this picture.










Quite a step/ledge here that fits inside the flywheel - I make it out to be just a little more than 5mm deep.


Another shot of the step


The Flywheel is from Chris "FlatChat" and is stamped FWN507


Crankshaft bolt spacing is 3" center-Center


As you can see, the pressure plate bolt holes (8mm as I recall) actual encroach upon the area for the pressure plate


The friction surface of the pressure plate is roughly 4mm taller than the pressure plate housing


At any rate - I believe from what I can see of your pictures that we have the same flywheel but different pressure plates.
I'm no Porsche expert by any stretch, but have been studying (looking for the parts) the Clutch assemblies for some time now. It seems to me that Porsche changed up the Clutch/Pressure-Plate/Flywheel configuration no less than a half dozen times from the mid 70's to the early-mid 90's - and most likely many more times before and after..

I hope this is of some help to you.

[Jac Mac]

Just looking @ CMS motorsport Trans ID pics-early 930 appears to be much shorter than late ( by approx 1" ). That would tend to indicate from Rons 3.5" vs 4.5" dimensions that his setup is to suit the later 930.

[Jeff Hamilton]

My first try on the G50 clutch I had a newer 1992 pressure plate and it was very close to fitting but too big. I suspect this was done to keep people from using the wrong one. I almost machined it down to fit. I got a 1989 model and it fit like a glove.
Jeff Hamilton

[Russ Noble]

Ron's trans pics show that he's got the later long bell.

[Ron Earp]

I've been sick all week as well and it still continues. Farking cough that won't go away and now my daughter has it too. Fun fun.....hope you get better soon, I'm slowly recovering but it'll be a bit longer before I'm 100%.

Thanks for the photos. They are very helpful. I'm pretty sure the flywheels are the same as mine is 26.X cm across on the inside flange as you show. Mine does not have a part number on it though as yours does.

Looks like my clutch/pressure plate is incorrect for the flywheel. I'm going to box all of it up together and return it to start over at square one.

[flatchat(Chris)]

..... and maybe you could use this for the clutch plate alignment -- the dimentias are metric .. BTW