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16" wheels

17" wheels

18" wheels

[05omegav6]

The only issues with that plan are...

1. Machining 2mm from the Omega hub face will give 2mm less for the wheel bolts to thread to.
2. Machining the rear of the disc hub instead will weaken that.

 

[Marks DTM Calib]

2mm is break all, wont have an impact in reality

[05omegav6]

Fair enough

[chrisgixer]

The only issues with that plan are...

1. Machining 2mm from the Omega hub face will give 2mm less for the wheel bolts to thread to.
2. Machining the rear of the disc hub instead will weaken that.

 

Just to clarify, i'm aware the outer circumference of the omega hub will not physically fit inside the phaeton disc. The omega diag shows a disc internal diameter of 139mm for the hub to fit into. Where as the poodon disc shows 135mm.
 So 2mm off the the outer circumference of the hub will mean removing most of , iirc, the chamfer on the hub edges.
 This will bring the hub outer edge 2mm closer to the 5 wheel bolt holes, which are 112mm pcb, but are a 0.5mm diameter smaller.
 Hub hole on the disc needs to be made a couple off mm bigger to accept the hub.

So all within a couple if mm here and there and all with metal to be removed.

Couple of things that bothers me
1 is the weight. Phaeton discs are twice as heavy.
2 the opel omega v8 discs had, what looked like, 12mm odd holes drilled around the hub housing of the disc, "to aid cooling of the hub". "The the hub bearing was also strengthened." somehow.
Obviously I'm going to struggle to replicate a stronger hub(bearing)
But does it needs holes around the hub housing of the disc?

There are some discs that have the holes as standard, but I forget which as I dismissed them on size in favour of the phaeton discs.

I'm also sure I saw that audi rs4/6 discs where if the same dimensions. But I'm unable to find that info again.
The rs6 discs are a work of art. (And priced accordingly )
Link to view. (Not buy)

http://www.ecstuning.com/Audi-RS6--4.2T/Braking/View_All/ES259508/

[chrisgixer]

Ps, alloy top hat of the rs6 also shows holes in the hub housing.

[Marks DTM Calib]

Struggling to see how those holes help cooling, not convinced the hub needs cooling anyway.

So anybody got an old hub I can wack in the lathe then

[chrisgixer]

Struggling to see how those holes help cooling, not convinced the hub needs cooling anyway.

So anybody got an old hub I can wack in the lathe then

Funny enough, I have two used ones here.

They are in good nic.

[chrisgixer]

Ps opels literature for the v8 says

Holes have been provided for improved ventilation of the brakes disc, sized 334mm x 32mm.

I presume to minimise heat transfer to the wheel baring? Maybe? Maybe the alloy top hats of the Audi discs would help further, given the minimal contact with the outer router/disc.

[chrisgixer]

http://www.dba.com.au

http://www.dba.com.au/wp-content/uploads/2013/07/DBA_CATALOGUE_2013-14_ver2.pdf

For Al, maybe.

[05omegav6]

Interesting reading

They list 3 of the 4 discs needed, with UK suppliers, but first impression of prices look to be more than AP

Shall investigate further and report back

[aaronjb]

So anybody got an old hub I can wack in the lathe then

I was just about to post that, too although I'm not convinced my little Myford would be man enough.

Any excuse to play on the lathe, though.

[chrisgixer]

Interesting reading

They list 3 of the 4 discs needed, with UK suppliers, but first impression of prices look to be more than AP

Shall investigate further and report back

The hsv/pitonheads forum often mention dba for economy reasons.

[Marks DTM Calib]

So anybody got an old hub I can wack in the lathe then

I was just about to post that, too although I'm not convinced my little Myford would be man enough.

Any excuse to play on the lathe, though.

Was planning to use the Harrison we have at the centre or one of the big Bridports

[05omegav6]

Interesting reading

They list 3 of the 4 discs needed, with UK suppliers, but first impression of prices look to be more than AP

Shall investigate further and report back

The hsv/pitonheads forum often mention dba for economy reasons.

Alot of Aussies and Yanks on there for the Aussies it is cheaper and easier to buy DBA at home rather than import AP from here. Also AP don't sell direct, and won't publicly supply contract parts that they sell to the factories. For the Americans, the DBA kit is cheaper than AP but still has to be imported. The other slight hiccup which affects the disc cost is the wheel pcd and hub dimensions, so basically obliged to buy top end discs...

The AP kit for the Monaro can be got from Monkfish for £1950 and second hand kits for either Monaro or VXR8 are about £1200, and whilst they will bolt straight on, the rear disc/mounting bell and front mounting bell all need to be bought as extras. The cheaper DBA discs are single piece, so of no use on the Omega

[chrisgixer]

Hmmm... A possible. Can't find any sizes though.

http://www.ebay.co.uk/itm/Front-Right-Brake-Disc-for-Audi-A6-02-05-/380721731667?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item58a4c89853