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NoDOHC · 04-17-2011, 10:52 PM

I doubt that the rotor is damaged, probably just the bearing (the circumferential lines are probably deposited bearing material, not removed rotor material). You can probably replace the bearings ($25.00 each) and have the rotor bearings good as new.

As to the rest of the rotor, you will have to check all the groove tolerances per the FSM. If the rotors match the specs, they will make compression.

Make sure that the rotors are within one letter of each other (2 letters if you are sticking with the stock rev limiter) and as long as they are both the same compression ratio and series, you are good to go.

It might not hurt to clean them very thoroughly and weigh them on a gram scale. If one is an s4 rotor, you will notice a significant weight difference (although you should be able to tell the s4 and s5 apart by the machined (s5) or as-cast (s4) appearance of the combustion chamber).

04-17-2011, 10:52 PM	#4
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	I doubt that the rotor is damaged, probably just the bearing (the circumferential lines are probably deposited bearing material, not removed rotor material). You can probably replace the bearings ($25.00 each) and have the rotor bearings good as new. As to the rest of the rotor, you will have to check all the groove tolerances per the FSM. If the rotors match the specs, they will make compression. Make sure that the rotors are within one letter of each other (2 letters if you are sticking with the stock rev limiter) and as long as they are both the same compression ratio and series, you are good to go. It might not hurt to clean them very thoroughly and weigh them on a gram scale. If one is an s4 rotor, you will notice a significant weight difference (although you should be able to tell the s4 and s5 apart by the machined (s5) or as-cast (s4) appearance of the combustion chamber). __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic) Last edited by NoDOHC; 04-17-2011 at 10:59 PM.