Front Rotors and Hubs

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enio45
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Front Rotors and Hubs

Post by enio45 » Sat May 23, 2009 12:45 pm

As im working my way thru the front suspension, i would like some advise on what to do with the front rotors and hubs?

My plan is to replace the bearings and shave the rotors slightly. What do you all do with the edges , hubs and bolts?

Should i media clean the edges and the hub areas, replate the hubs??

Can they shave the rotors seperated from the hubs?

Thank you for the advise and guidance.
Ed Montini
330 GT 2+2 Series II - 8289
58 Ellena - 0855GT - orig drivetrain

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John Vardanian
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Re: Front Rotors and Hubs

Post by John Vardanian » Sun May 24, 2009 1:37 am

Hi Ed,

I washed mine in solvent, sand blasted them then had them shaved. I couldn't resist painting the naked metal, so I used the leftover paint from the fuel filter to cover the non-frictioned surfaces.

As for the hubs and the hardware, I understand they should be black oxide treated.

john

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250GT
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Re: Front Rotors and Hubs

Post by 250GT » Sun May 24, 2009 8:33 am

John Vardanian wrote:Hi Ed,

I washed mine in solvent, sand blasted them then had them shaved. I couldn't resist painting the naked metal, so I used the leftover paint from the fuel filter to cover the non-frictioned surfaces.

As for the hubs and the hardware, I understand they should be black oxide treated.

john

Image
Wel this is something for the GALLERY.
It will SMELL terrible after using these rotors
Not to be imitated this kind of restauration!!!!
John did you remove the balancing holes on the outside rims?
ciao
Cornelis

enio45
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Re: Front Rotors and Hubs

Post by enio45 » Sun May 24, 2009 3:27 pm

Impressive for sure.....!!

Couple of more questions if i may.....

1. If i take off the hubs, do the rotors need to be reinstalled on the same hub and the same orientation?
2. What balancing holes are we talking about?
3. Can any good brake shop do the rotor cutting once i take them off the hub, or should i bring the whole assembly in first to have them shaved?

Thanks again.....
Ed Montini
330 GT 2+2 Series II - 8289
58 Ellena - 0855GT - orig drivetrain

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330GT
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Re: Front Rotors and Hubs

Post by 330GT » Sun May 24, 2009 10:02 pm

When I had mine done by a machine shop that knows Ferraris, they want the whole rotor and hub together. They had a special tool to remove the locking rings that hold in the bearings and spacer. Got everything back with turned rotors and re-packed bearings. See http://www.parrotbyte.com/kbc/ferrari/FrontBrakes.htm for details.
Regards, Kerry
http://www.330gt.com 330 GT Registry
http://www.parrotbyte.com/kbc/ferrari 250 PF Coupe 1643GT, 330 GT 2+2 8755GT, 308 GTS 23605

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John Vardanian
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Re: Front Rotors and Hubs

Post by John Vardanian » Mon May 25, 2009 4:01 pm

Hi Cornelis, what are the "balancing holes"?

Ed, I am unable to understand what is to be gained by turning the units as hubs/disks alltogether. Swapping the disks (left to right)... who cares. Once you turn the disks it's all starting from anew anyway. The hubs, of course, are unique to each corner of the car.

john
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Rudy van Daalen Wetters
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Re: Front Rotors and Hubs

Post by Rudy van Daalen Wetters » Mon May 25, 2009 11:50 pm

John,

I would assume rotors would need to be balanced to
avoid vibrations at certain speeds, therefore
balancing holes to correct weight distribution?

Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705

enio45
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Re: Front Rotors and Hubs

Post by enio45 » Tue May 26, 2009 12:01 am

so where are these balancing holes??
Ed Montini
330 GT 2+2 Series II - 8289
58 Ellena - 0855GT - orig drivetrain

Rudy van Daalen Wetters
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Re: Front Rotors and Hubs

Post by Rudy van Daalen Wetters » Tue May 26, 2009 12:16 am

Drilled on the very outer rim of the hub,
like on a flywheel.

Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705

Rudy van Daalen Wetters
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Re: Front Rotors and Hubs

Post by Rudy van Daalen Wetters » Tue May 26, 2009 12:38 am

Hubs and discs should always be turned as
a single unit, no mixing.

Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705

250GT
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Re: Front Rotors and Hubs

Post by 250GT » Tue May 26, 2009 2:51 am

John Vardanian wrote:Hi Cornelis, what are the "balancing holes"?

Ed, I am unable to understand what is to be gained by turning the units as hubs/disks alltogether. Swapping the disks (left to right)... who cares. Once you turn the disks it's all starting from anew anyway. The hubs, of course, are unique to each corner of the car.

john
Hi John,
My first thought when I say the NICE gallery rotor foto, was that these were aftermarket, retro fitted discs,
I am only famaliair with pre 1962 cars ALL those I owned/own have those balancing holes!
So Ferrari tuned these rotor probebly only in the early diskbrake cars?
But I unsure
I will send you foto's on your privat mailaddresse
I am to stupid ??? to place them here, sorry
May be you can place them for meto lett Enio how they look like
Its always nice to see someting unknown.
thanks in advanve
ciao
Cornelis

250GT
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Re: Front Rotors and Hubs

Post by 250GT » Tue May 26, 2009 3:55 am

Rudy van Daalen Wetters wrote:Drilled on the very outer rim of the hub,
like on a flywheel.

Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705
Rudy ,you have the right nose,

Some rotors does have only a few holes 5-7, other have more than 40........
These looks like modern air vantilated disks, but are not.
So it must have something to do with balance.

Toyoto Corola gone ? its a pity.

Ciao
Cornelis

enio45
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Re: Front Rotors and Hubs

Post by enio45 » Tue May 26, 2009 10:39 am

very interesting debate - ill take a closer inspection on mine today looking for the balancing holes.

I dont have any need to seperate the rotors from the hubs except for the fact that im replating bolts and nuts and other front end parts...so the thought would be to replate the hubs. However, i can live with cleaning them up as is and turn the rotors etc.

More later after an inspection.

Thanks for all the input
Ed Montini
330 GT 2+2 Series II - 8289
58 Ellena - 0855GT - orig drivetrain

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John Vardanian
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Re: Front Rotors and Hubs

Post by John Vardanian » Thu May 28, 2009 12:11 pm

The idea of balancing the disk and hub together is bunk, because there is no flywheel action there (like in a drum brake), the circumference is small and the mass (bearings and collar) is concentrated in the center.

Anyway, here are some picures from Cornelis showing the "balancing holes". Do you have these on your cars? Mine didn't.

john

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enio45
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Re: Front Rotors and Hubs

Post by enio45 » Thu May 28, 2009 12:15 pm

I looked closely at my fronts and there are NO marks on them for balancing.

However on another topic, there was some scribe mark on the hub areas that said CMR 515 7154 (im going by memory on the numbers but the starting with 5 is correct and the 7 is correct as well. any idea what these mean?

both hubs had the same thing scribed in them :?:
Ed Montini
330 GT 2+2 Series II - 8289
58 Ellena - 0855GT - orig drivetrain

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