90 S-4

Mark,

McMaster Carr has spacers, look on line at their site, the one I attached is
just a sample of what could for you.

Also, you should first confirm that a 322 mm disc can be made to fit the
radius of a S4 caliper. Make a cardboard disc that is 322mm in dia, then
try to put it inside the caliper to see if it clears the edges. If it won't, it will
at least show you where to remove the material (alum) from the inside ends
of the caliper. Keep grinding and check fitting with the template until the
cardboard Disc/rotor fits inside the caliper. Then go a tiny bit more so you'll
have room to fine tune the spacing of the caliper, you'll want to check it with
the pads in the caliper then shim the caliper out so the edges of the pad material are flush with the outside radius of the rotor.

And, for what it's worth, Devek used spacers and washers to do what your
doing. They never had a problem and neither have I using the round spacer
vs the long single strap method that was mentioned in this post earlier.


McMaster Carr (630) 600-3600.
Spacers > Type > Female Unthreaded Round Type > Material Type > Finish > Body Length > Screw Size
Spacers and Standoffs
This product matches all of your selections.

Part Number: 92510A817 1-9 Each $8.62 Each
10 or more $7.31 Each
Type
Female Unthreaded Round

Female Unthreaded Round Type
Standard

Material Type
Aluminum

Finish
Plain

Body Length
3/8"

Body Length Tolerance
±.005"

Screw Size
1/2"

Outside Diameter
1"

Outside Diameter Tolerance
±.003"

Inside Diameter
.505"

Inside Diameter Tolerance
+.010"/-.000"

Threading
Unthreaded

Rockwell Hardness
B60

Tensile Strength
55,000 psi

Specifications Met
Not Rated

Panzer9

Not sure " irregardless" is a word

Mrmerlin

Nice Beemer

the flyin' scotsman

Perhaps its a Canadian word; certainly in much use over the pond.

Mark............if this project is sucessful would you be able to supply Roger et al with what would be required for a 'kit' for sale to others.......TIA.

mark kibort

irregarless is not a word, but I should never be correcting grammar here on this list!

Yes, I will make all the parts available for a kit from someone, either 928inl, Roger or Me.



mk

blitz928

It isn't...

mark kibort

Hi Joe, thank for the pics. do you have the pics ofthe caliper ground down area??

Ill do this. I already math'ed it out and think ill need about 2-3mm of grinding at the edge, and much less as you go inward. it looks about as much as you took off on the CnC pics of the calipers.

Ill do the mock up though. good idea.

those spacers look pretty big. Its says 3/8"s on the spec, but they look bigger. the ID says .505", i think the bolt thickness is more like .47". I think we want to have more of a close fit there, almost interference to fight some of the issues with shear brought up here in this discussion.

Mark

the flyin' scotsman

Slow day in Porsche land:

http://www.askoxford.com/concise_oed...rdless?view=uk

90 S-4

Mark,
The bmw is a 1975 yr/mdl, there isn't a kit available, so I made my own..

mark kibort

I erased that when It occured to me who you were and what the car was.

very cool upgrade project. So, those are the 350mm rotors?

any pics of the final machining before you bolted them up?

thanks,

Mark

90 S-4

Mark,
The only pic I have is the two of them on the cnc, but you get the
idea.. Before you start cutting, do the mock up first, it would suck
to do all that work and not have them fit.
There are more spacers to pick from in the McMaster catalog, you
could find another better to your liking.

mark kibort

that spacer shown in the picture is not the spacer you found for me from McMaster, rigth? it looks a lot longer than it is wide. the spacer you found was 1" diameter and had a .505" inner diameter which is almost perfect for what im doing, but im a little worried about the spacer not being an interference type of a fit, or at least tight.

I looked everywhere for spacers, washers and came up empty last night. Thanks for the information!!

I might just have a set or two made by a friend with all the CnC stuff with the ID being a little closer to the bolts.

Now, new bolts just buy from 928intl for the GTS calipers??

Mk

90 S-4

Mark,
Yes, 350mm The way I came up with the 350 was by using cardboard
disc templates of different diameters, 13", 13.25", 13.50", 13.75" etc,
I kept cutting away the caliper to a safe depth and checked the rotor dia
with the templates as I went. I had cut as far as I thought safe, measured
with the 13.75" template and called it a day.. FWIW, the link below is the
car it was done on.

http://s296.photobucket.com/albums/mm180/OC570/

Glenn M

Joe,
Very nice! What is the heat sheild material made by?
Glenn

90 S-4

Thanks..
Got it here >> http://www.b-quiet.com/extreme.html