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Discussion Starter · #1 ·
This has been mentioned a couple of times in recent threads. I have the conversion with std spaced calipers. What I dont know is what the discs are originally from or what they are modified from :cry: . Anyone know?
If the dimensions would help anyone else I have measured mine up and can post them if needed.
I can also remember seeing a Sud many years ago with a 4 pot conversion on the inboard brakes :wow: :inlove: . Again has anyone done this or know whats needed?
Regards rsfruitbat
 

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This has been mentioned a couple of times in recent threads. I have the conversion with std spaced calipers. What I dont know is what the discs are originally from or what they are modified from :cry: . Anyone know?
If the dimensions would help anyone else I have measured mine up and can post them if needed.
I can also remember seeing a Sud many years ago with a 4 pot conversion on the inboard brakes :wow: :inlove: . Again has anyone done this or know whats needed?
Regards rsfruitbat
suds have either 45mm inner driveshaft head or 35mm + 10mm spacer
and used 60mm bolts.

the later style disks required the bolts to go through the disks as well so used 70mm long bolts.

thats normally 35mm for the drivshaft head, 10mm for the spacer, 10mm for the disk, 10mm for the inner hub and 5mm sticking out, give or take a half mil here or there
 

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I have a vague recolation that Fiat coupe turbo discs were mentioned on a web site somewhere. Someone else mentioned a mazda truck. It makes sense to be something like this as beining inboard they are quite large diameter, this is good as it gives good leverage (and therefore stopping) even on the piddly little standard pads. Has anyone got the details of the standard disc dimensions offset , 'hub' diameter etc. to be able to search through one of the part books?
RSFruitbat post your dim's these could be looked up too.
Regards James
 

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Discussion Starter · #4 ·
My conversion was bought long before there were Fiat coupe turbo's so mine must have come from elsewhere. I will sort out the dimensions I have and post them.

Ta rsfruitbat
 

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Discussion Starter · #6 ·
Vented disc dimensions. Here goes:
overall OD - 257mm
working face ID - 155mm (working area = 51.05mm, 43.3mm used)
thickness - 20.6mm (skimmed several times)
6 bolt fixing PCD - 140mm
What it looks like has been done is they have turned down some 4 bolt discs to make the adaptor plate.
There is an offset but didnt make a note of it. I got round it by making some spacers to put between calipers and gearbox and have never had any problems with this solution.
Hope this helps, rsfruitbat
 

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I'm sure the discs were usually from a 1980's Mazda Pickup
 

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A Mazda B200 if I remember correctly. They are a little larger in diameter (258mm) so they have to be slightly machined. And they fit the old-style 4-bolt hubs, not the later 6-bolt ones.

I wonder if there is room for an adaptor bell to fit the 6-bolt hubs. Then we could bolt hubless 257mm rotors on to it but that would be expensive.
 

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rsfruitbat
Is your's a 6 bolt flanged gearbox ?
If so this looks possible for us by machining the current solid discs into an adapter plate or making our own up from solid.
Will price up / get drawing of mazda B200 discs from the wholesaler when I am next there - I need to order headgaskets and cam belts anyway at some point soon.
If you could post a photo of the bits that would be fantastic.
On another issue , getting our engine down to the shop be rebored and price for balancing tomorrow. Brakes may have to wait....
Regards
James
 

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Discussion Starter · #10 ·
My discs are fitted onto a 1200Ti box which still has the holes for the original 4 bolt fixings. I dont see as there would be a problem doing the same as they have done for mine and just turn std 6 bolt fixing discs down to make an adaptor plate to mount the vented discs off.
From your other link it certainly sounds like Volvo 140 4 pot calipers would do the job.
I will be having my gearbox out Xmas time and I can measure up the caliper spacers and the spacer to centralise the caliper on the disc.
I am going to have a look through the Wilwood and Brembo stuff to see if one of their calipers or discs might do the job.
Regards rsfruitbat
 

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Discussion Starter · #13 ·
I think I must have the group 4 escort discs that the other thread refers to as my discs are currently at 20.6 and I have had them skimmed several times!! I have always been concerned about spares so at least I have got some options now. I am gonna see if I can track down some volvo 140 calipers and transfer H/brake onto back.

Let me know how your engine build goes.
Regards rsfruitbat
 
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