GermanLook Forums  

Go Back   GermanLook Forums > Technical Section > Brakes

Reply
 
Thread Tools Display Modes
  #1  
Old February 19th 2013, 15:26
-Alex- -Alex- is offline
Registered User
 
Join Date: Oct 2009
Location: Finland
Posts: 276
2-piece rotors, bolt + threaded hat, bolt+locknut or bolt+special nut?

What would be optimal type of attaching rotors to hats? I have wilwood non floating rotors.

First option is threaded hat and bolt:



Second option is bolt and all metal locknut





Third option is bolt and special stepped nut like bobbins.



Reply With Quote
  #2  
Old February 19th 2013, 18:59
owdlvr's Avatar
owdlvr owdlvr is offline
Registered User
 
Join Date: Sep 2008
Location: Canada - West Coast
Posts: 724
The ideal would be to use a floating design with a specially designed floating nut or bobbin. Otherwise, go with a threaded hat like your top example. The only downside is possible damage to the hat with difficult to remove hardware (ie you strip the head and have to drill out the bolt). If this was a concern I would look at using a special step nut like the lower unit, but as you are using fixed rotors I'd save weight and thread the hats.

Elliptical offset nuts (all-metal-locknuts) are fantastic in some applications. For use on a brake rotor, however, I'd want to ensure aircraft-quality pieces, where the temperature and tensile strength are matched between bolt and nut. This is the only way to ensure they are truly reusable. For the cost, hassle and weight, just thread the hats.

Loctite 290 or 242 on the hardware, and use a belleville (domed) washer under the bolt head.

-Dave
__________________
--
'71 Type 1 - Rally Project
'58 Type 1 - I bought an early...
'75 Type 1 - Family Heirloom
'93 Chevy 3500 pickup - Cummins Swap
Reply With Quote
  #3  
Old February 20th 2013, 21:55
Humble's Avatar
Humble Humble is offline
Registered User
 
Join Date: Jan 2003
Location: Boulder Creek, CA
Posts: 758
Not to pry too deeply but are you working on a 2 piece rotor and brake setup for super's and/or standard bugs? I've been looking at off the shelf options using wilwood, 2 or 4 pot calipers and 2 piece 10.75" rotors.

As for brake rotor/hat assembly, the floating race setup is nice but not necessary for most applications. I'd go with the threaded hat or the stepped bobbin to keep things simpler.
Reply With Quote
  #4  
Old March 1st 2013, 15:36
-Alex- -Alex- is offline
Registered User
 
Join Date: Oct 2009
Location: Finland
Posts: 276
My painter has Alcon floating brakes on factory made ex-Frank Biela race Audi 80, but he has also left two 330x32 fixed wilwood rotors and aluminum hats together with just bolts and all metal jet nuts from "super saloon" class 900kg Volvo PV with 250+hp, and they worked great at track. Car was race only, but not some 700hp track monster

If you havent seen what car i am talking:



Audi is different, it has huge factory racing brakes from Alcon, with floating hats, barely fits to 18" center locking wheels. Whole car looks like almost stock old audi 80, but looks can be deceiving..carbon fibre fenders, hood, doors, nothing left from stock suspension etc.






I think i go with stepped nuts from cromoly and 12.9 capscrews, wonder if these materials like electric zinc coating?
Reply With Quote
  #5  
Old March 1st 2013, 17:19
owdlvr's Avatar
owdlvr owdlvr is offline
Registered User
 
Join Date: Sep 2008
Location: Canada - West Coast
Posts: 724
Any chance you could provide me with more photos of the Audi? Cut my teeth in cars playing with lots and lots of Audi's...

-Dave
__________________
--
'71 Type 1 - Rally Project
'58 Type 1 - I bought an early...
'75 Type 1 - Family Heirloom
'93 Chevy 3500 pickup - Cummins Swap
Reply With Quote
  #6  
Old March 1st 2013, 17:28
-Alex- -Alex- is offline
Registered User
 
Join Date: Oct 2009
Location: Finland
Posts: 276
Yes i can have more pics, i see my painter almost weekly basis. When he bought it, there was stock chipped 5-cyl engine, but now he is getting built 1.8 turbo engine with 500+hp.

With that almost stock 5-cyl engine, he could not outrun Fiat Uno turbos at track
Reply With Quote
  #7  
Old March 5th 2013, 11:23
jmd's Avatar
jmd jmd is offline
Registered User
 
Join Date: Jan 2006
Posts: 138
As an S4 driver I am totally smitten with the audi... more deets?

As for these brakes... tap out the hat but make sure the hat depth is thick enough to handle it...
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 05:41.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
© www.GermanLook.net 2002-2017. All Rights Reserved