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Floating discs at last
#1521049
10/01/2015 12:16
10/01/2015 12:16
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Joined: Dec 2005
Posts: 17,370 Staffordshire
Nigel
OP
Forum veteran
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OP
Forum veteran
Joined: Dec 2005
Posts: 17,370
Staffordshire
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After more than a decade of killing one piece cast discs, I've finally found some floating discs teaser pic for now, until I can take some proper photos later.... They are not meant for a Coupe, but they fit without any modification to either the disc, carrier or hub / caliper - the only element that I have to resolve is that the centre bore of the disc is 60mm, but the Coupe hub is 59mm, so I need to come up with the equivalent of a 0.5mm thick "spigot ring". They are 4 x 100, but the bolt holes are 1mm bigger than the Coupe discs, so they fit without having to open up the holes. The only element that doesn't pan out is the small securing bolt, as the PCD is a little too far out. I'm SO chuffed - I took an expensive punt on these, as most of the dimensions were the same as the Coupe, but a couple were different enough to have caused an issue - however, I've trial-fitted them to a hub with caliper and they are fine. Just trying to see if I can get any more
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Re: Floating discs at last
[Re: Nigel]
#1521096
10/01/2015 18:47
10/01/2015 18:47
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Joined: Oct 2008
Posts: 6,783 In the coupe.
magooagain
Club Member 259
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Club Member 259
Forum is my life
Joined: Oct 2008
Posts: 6,783
In the coupe.
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On bigger machinery i have seen welds added to spigot's and the like,then machined out to the correct radius. All though half a mm of weld may be risky?
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Re: Floating discs at last
[Re: barnacle]
#1521147
10/01/2015 21:24
10/01/2015 21:24
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Joined: Dec 2005
Posts: 17,370 Staffordshire
Nigel
OP
Forum veteran
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OP
Forum veteran
Joined: Dec 2005
Posts: 17,370
Staffordshire
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You've been multiplying by pi, so you have... but don't forget it's another three and a bit millimetres circumference at the outside of the hole. Aye - I twigged that, but I'd prefer there to be a small gap in the ring, rather than it being a perfect circumferential length - will allow for a bit of expansion due to heat
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Re: Floating discs at last
[Re: Nigel]
#1521156
10/01/2015 22:20
10/01/2015 22:20
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Big_Muzzie
Unregistered
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Big_Muzzie
Unregistered
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I thought only the 695 carried floating discs as standard?
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Re: Floating discs at last
[Re: Nigel]
#1521182
11/01/2015 09:48
11/01/2015 09:48
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Joined: Dec 2005
Posts: 33,677 Berlin
barnacle
Club Member 18 - ex-Minister without Portfolio
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Club Member 18 - ex-Minister without Portfolio
Forum Demigod
Joined: Dec 2005
Posts: 33,677
Berlin
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You've been multiplying by pi, so you have... but don't forget it's another three and a bit millimetres circumference at the outside of the hole. Aye - I twigged that, but I'd prefer there to be a small gap in the ring, rather than it being a perfect circumferential length - will allow for a bit of expansion due to heat A fair point, but I'm concerned that if you don't get an exact match you could effectively have a flat spot where the gap is. Shouldn't be a lot, though; don't forget that you will stretch the outside of the strip when you curve it. Also, the hole will expand when the brakes are hot; with cast iron centres and stainless steel rings you'll have a similar expansion ratio difference as you have with piston rings/cylinder bore, and they get away with about ten thou. What's the advantage of floating discs?
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Re: Floating discs at last
[Re: Nigel]
#1521253
11/01/2015 19:51
11/01/2015 19:51
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Big_Muzzie
Unregistered
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Big_Muzzie
Unregistered
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Personally I'd machine out the disc, including a key, and go and see your local wire erosion firm and get them to make some inserts. They work to 0.5 microns (usually) so I am sure they'd get an OE fit for you.
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Re: Floating discs at last
[Re: Nigel]
#1521260
11/01/2015 20:40
11/01/2015 20:40
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Per
Unregistered
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Per
Unregistered
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Looks good Nigel! Knight 7660: I got some response from Compbrake for split 330mm disc's before my Coupe was destroyed, just in case you're on the hunt! Check them out, I asked for Alfa 147 GTA 330mm replacement discs with 98x4 holes so it would fit straight on. Lucky me I never got to pay!
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Re: Floating discs at last
[Re: Nigel]
#1521299
12/01/2015 00:58
12/01/2015 00:58
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Per
Unregistered
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Per
Unregistered
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Aha. Good riddance then..
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Re: Floating discs at last
[Re: Nigel]
#1521404
12/01/2015 20:16
12/01/2015 20:16
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jonofitzer
Unregistered
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jonofitzer
Unregistered
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A machine shop should be able to bore them out in a couple minutes and make you the spacer rings also. Another option is to build the gap with weld and machine it to desired bore.
I converted my hubs to 5 stud which involved machining the disks and hubs and a custom alloy spacer. Have not had a single problem yet
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Re: Floating discs at last
[Re: Nigel]
#1531038
23/03/2015 12:22
23/03/2015 12:22
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Gimmo
Unregistered
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Gimmo
Unregistered
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Good luck Nigel. A friend of mine in Italy has got Brembo Abarth EsseEsse floating discs. They are expensive, but great!
Good work!
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Re: Floating discs at last
[Re: ]
#1531049
23/03/2015 13:33
23/03/2015 13:33
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Joined: Dec 2005
Posts: 17,370 Staffordshire
Nigel
OP
Forum veteran
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OP
Forum veteran
Joined: Dec 2005
Posts: 17,370
Staffordshire
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Good luck Nigel. A friend of mine in Italy has got Brembo Abarth EsseEsse floating discs. They are expensive, but great!
Good work! On a 20VT? - If so, could you ask him to contact me to let me know what modifications were needed
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