Front rotor question

zztot · 02-01-2009, 06:59 AM

Guys:
Had cross drilled and slotted rotors on the car (914-6) and discoverd one cracked.
Bought used as part of a package so not really sure what they are and neither is seller. Using with big Wilwoods.
Picked up a set without drilling (ATEs with fancy pattern) but a significant dimension difference that has me puzzled.
Both old and new are 11' (plus a tick) in diameter. Old ones are about 15/16" thick, while new ones are closer to 3/4" thick. Anyone able to tell me what rotors are thicker or guidance as to how much difference. Believe new ones are an SC part.
Having to respace calipers and somewhat concerned over piston projection.

Thanks ,
TOT

turborat · turborat's Garage

Carrera rotors are slightly thicker that SC rotors. My guess is that you have one of each.

Bill Verburg · Bill Verburg's Garage

Quote:

Originally Posted by zztot

Guys:
Had cross drilled and slotted rotors on the car (914-6) and discoverd one cracked.
Bought used as part of a package so not really sure what they are and neither is seller. Using with big Wilwoods.
Picked up a set without drilling (ATEs with fancy pattern) but a significant dimension difference that has me puzzled.
Both old and new are 11' (plus a tick) in diameter. Old ones are about 15/16" thick, while new ones are closer to 3/4" thick. Anyone able to tell me what rotors are thicker or guidance as to how much difference. Believe new ones are an SC part.
Having to respace calipers and somewhat concerned over piston projection.

Thanks ,
TOT

911 '69 -'83 are 20x290mm
911 '84 - 89 are 24x290mm

zztot · 02-01-2009, 06:51 PM

Thanks guys ...Mystery solved.
TOT