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-   -   Need Help Identifying Floating Rotors (http://forums.pelicanparts.com/porsche-911-technical-forum/700709-need-help-identifying-floating-rotors.html)

RSnider 08-31-2012 10:19 AM

Need Help Identifying Floating Rotors
 
Short explanation: I bought a Group 2 BMW E21 320i touring car several years ago. The car was built in the 70's to race in the ETCC. The origin of the brake rotors has always been somewhat of a mystery to me until I stumbled across some photos of the floaters from the Porsche 930. I haven't compared exact dimensions yet, but it looks nearly identical to the floating rotors used on the Porsche 930, except with a different (offset) hat, which got me wondering if my rotors were OEM Porsche. Just like the 930 front floating rotors, my rear rotors have 12 "dog slots"; however, my front rotors have 10 slots. Initially, I thought the rotors with 10 slots were possibly from the 993, until I realized the 993 floating rotors don't have open slots, just holes.

So my question is, did Porsche ever produce a floating rotor with 10 "dog slots"? Or was that simply a common design of that era? Are there any manufacturers that still produce that design?


For reference:

930 floating rotor - 12 slots:
http://forums.pelicanparts.com/uploa...1323219449.jpg

993 floating rotor - 10 holes, no slots:
http://forums.pelicanparts.com/uploa...1323275975.jpg

Bill Verburg 08-31-2012 12:32 PM

Quote:

Originally Posted by RSnider (Post 6947397)
Short explanation: I bought a Group 2 BMW E21 320i touring car several years ago. The car was built in the 70's to race in the ETCC. The origin of the brake rotors has always been somewhat of a mystery to me until I stumbled across some photos of the floaters from the Porsche 930. I haven't compared exact dimensions yet, but it looks nearly identical to the floating rotors used on the Porsche 930, except with a different (offset) hat, which got me wondering if my rotors were OEM Porsche. Just like the 930 front floating rotors, my rear rotors have 12 "dog slots"; however, my front rotors have 10 slots. Initially, I thought the rotors with 10 slots were possibly from the 993, until I realized the 993 floating rotors don't have open slots, just holes.

So my question is, did Porsche ever produce a floating rotor with 10 "dog slots"? Or was that simply a common design of that era? Are there any manufacturers that still produce that design?


For reference:

930 floating rotor - 12 slots:
http://forums.pelicanparts.com/uploa...1323219449.jpg

993 floating rotor - 10 holes, no slots:
http://forums.pelicanparts.com/uploa...1323275975.jpg

The 993 rotor is not really a floating design

but yes, 930 from '78-80 used a 304x32mm floating annulus

here is a pic of one
http://forums.pelicanparts.com/uploa...1346445118.jpg

RSnider 09-01-2012 01:55 AM

That's the same photo I posted in my OP (I snagged it from another thread on the forums).

Bill Verburg 09-01-2012 02:39 AM

Quote:

Originally Posted by RSnider (Post 6948639)
That's the same photo I posted in my OP (I snagged it from another thread on the forums).

and it is an oe 930 floating rotor

RSnider 09-01-2012 08:05 AM

That much I already knew (I just included the photo as a reference for the number of slots). I still need to compare critical dimensions with my rotors are the OE porsche rotors to determine if they are, in fact, Porsche OE. Or at least the rotors with 12 slots.

Still no word if Porsche ever made a similar rotor with only 10 slots.

safe 09-07-2012 03:03 AM

Found these in an add, so I can't verify the information. Looks like 10 slots.


"380 mm floating 993 GT2 EVO rotors. The centers are Porsche Motorsport."

http://forums.pelicanparts.com/uploa...1347015627.jpg

Bill Verburg 09-07-2012 03:37 AM

Quote:

Originally Posted by safe (Post 6961002)
Found these in an add, so I can't verify the information. Looks like 10 slots.


"380 mm floating 993 GT2 EVO rotors. The centers are Porsche Motorsport."

http://forums.pelicanparts.com/uploa...1347015627.jpg

This is the complete 380mm GT2 EVo front brake set up
http://forums.pelicanparts.com/uploa...1347017774.jpg


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