In The process Of Building Engine, I Have Set Of Good Condition S4 N/A Rotors which are stamped "C" and do you think i can use that in my S5 T2 engine which came with "D" Rotors? without balacing anything.

 

ideally keep the letters matched in pairs for the best balance, you can use a matched pair of rotors in any 13B engine as long as you use the counterweights from that same series of rotors.

basically you could run series 4 rotors in an FD REW block if you wanted, as long as you used the series 4 front and rear auto balancer.

 

when u say rear counter weight, thats for automatic right?

 

if you were running series 4 in an FD it would need a light flywheel(which requires the auto rear counterweight), just used that as an example. if using series 4 rotors in a series 5 you can use the series 4 flywheel(manual factory rear counterweight).

rotors and counterweights need to stick together but can go into any 13B shell of a motor.

rotors can be within 2 letters of one another and be within spec but for the best results a matched pair should be used. also keep their orientation the same, try not to swap a rotor that used to be in front to place it in the rear. the rotor seal slots are worn in a certain direction and it makes the apex seal slot sloppy. front rotors have a single notch in the oil drain casting right next to to bearing, rear rotor has a II stamp, turbo rotors have a T stamp also.

 

now that is good to know cuz, i screwed up which rotors are which on my t2 cuz it was one gigantic black triangles. lol