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Brack Disc Spacer


richardm6994

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On the lotus 23 project, everything so far is having to be made bespoke to the car and the rear hubs / drive train is no different.

 

Just wondering, can anyone think of any issues with a 20mm spacer plate being placed between the outside face of the hub-flange and the inside face of the brake disc in order to push the brake disc (and wheel) out?

I don't think it's a problem, but I've not come across it before and wondered if there was a reason why

 

I'm thinking along the lines of machining something similar to PCD adaptor, so the spacer will be bolted to the hub-flange (using the existing studs in the flange) and would have new studs for the wheel...

a bit like this...

pcd_adaptor.jpg

Edited by steamer
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Could you not shim the entire hub out instead?

 

Edit: actually that might not work because of the drive shafts... was just thinking Ive seen that done on renaultsport clios on the rear, but obviously they are fwd.

Edited by theduck
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I would have thought just the usual things really... as said, the increased load on bearings is the obvious one. I presume the wheel studs have now got to pass through this additional 20mm, so there's the fuss of increasing those, and I guess you need to make sure it all locates centrally and clamps up good to ensure it's mated properly and isn't putting any stress across the bolts, particularly when someone slams the brakes on. I guess normally people have a disc or hub carrier machined, with the offset already in it. You're not really doing much different other than it's not going to be attached except by the clamping forces of the wheel nuts/studs? Would expansion/contraction under heat be a cause for concern maybe? Dunno :-S

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Guest lotusPaul

I agree with the above statement.

By moving the weight further away from the hubs you are increasing unsprung weight, or actually decreasing the effectiveness of the springs. Look at the elan plus 2 hubs, the weight is on the innermost point of the upright. Alot of boy racers used hub spacers back in the day and fitted widder wheels, destroyed bearings yes. But also the top of the rubber rubbed on the arch. Id also check your clearances there too.

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Thanks for the input guys.

I'll try and get some new photos of the problem itself in the next day or so.........but to try and describe the problem I'm having with old / googled images;

 

The cast ally hub carrier has the wheel bearing press fitted through the centre

 

A8_D47_A74-3319-4581-9_C5_F-_AB04_C3_FA6

 

 

With the bearing and drive flange fitted into the hub, when the the discs are fitted, they clash with the hub (red arrow) because they sit over the drive flange the rear of the disc and sit too far back by about 15mm.

 

disc_clash.jpg

 

hub_clash.jpg

 

 

drive_flange.jpg

 

 

I can't bring the drive flange forward as too much of it would be out of the bearing and I can't bring the bearing forward as too much would be out of the cast ally hub carrier.

 

I also can't build up the front of the hub carrier to allow the flange and bearing to sit further forward at it would cause problems at the other side of the hub carrier with the splined cv joint then not being long enough to fit into the drive flange.

cv_joint.jpg

 

 

So what I was thinking is with the bearing and drive flange fitted as far foward as possible within the carrier as possible, would be to fit a 15-20mm disc spacer between the drive flange and inside face of the disc.

 

regards the brake carriers etc.....these are all going to be bespoke made to suit wherever the disc ends up.

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You'd have to be prepared to bend over and lube up, but GKN Driveline have a motorsport division (unit in Minworth, near Sutton Coldfield) and they'll pretty much make you an outer CV to any spec you like; last time I had a quote they were about £800 a pop ;)

 

Assuming you can't find an OE part with the right specs but a bit longer... :(

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Do any of these help as per Paul & Peter's suggestions??

The guys at RD are all petrol heads & enjoy a challenge, it may be worth a call to discuss the problem?

https://www.rallydesign.co.uk/advanced_search_result.php?search_in_description=1&keywords=wilwood+disc+bell&x=9&y=13&osCsid=cr4h0st0tmqfgslk1kh4a6vip5

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