Did some searching, and I haven't found a definitive answer, so...



I have a GSL-SE 13b, which I intend to rebuild with 12A irons, so I can maximize the porting. My question is: Can I use S5 NA Rotors and e-shaft? If so, what machining/balancing/weights would I need?



Has anyone done this combination before?

Yes you can. All you need is the flywheel and front counter weight to match the rotors. So everything should be S5 if you're going to use the S5 rotors. As long as it's in good shape and gives proper bearing clearnace use the -SE eshaft. It doesn't have the thermal pellet in the end. One less source of potential failure.

I just had my S5 Rotating assembly balanced. Unknown history of the parts, But I would venture a guess they were just pulled off the shelf. The builder had a "b" and a "d" series rotor. 46 Grams difference in weight. When the assembly was spun up; it was in decent balance. When the assembly was de-accelerating it was a whole nuther story, it literally bounced on the balanacer.



The poing I am trying to get across: Spend the $$$ to get it balanced. I would use:(In no particuliar order)

1. Stan at SDJ Motorsports

2. Carlos at CLR Motorsports

3. Paul Yaw

4. Rick Engman

5. MAndenville

6. Daryl Drummomd

7. Racing Beat

what's wrong with mazdatrix?

[quote name='C. Ludwig' date='Apr 21 2005, 10:39 AM']Yes you can. All you need is the flywheel and front counter weight to match the rotors. So everything should be S5 if you're going to use the S5 rotors. As long as it's in good shape and gives proper bearing clearnace use the -SE eshaft. It doesn't have the thermal pellet in the end. One less source of potential failure.


[/quote]



I am in the middle of an S4 TII engine rebuild. The main bearings seized, so obviously I should have to get a new e-shaft. Would I be better off buying the SE shaft? It is my understanding that the TII and SE shafts have the same main dimensions. Does the oil passages and jets have the same capacity?

per the fsm/parts system.



you need to use the matching counter weights to the rotors. if you use gsl-se rotors then you need gsl-se counterweights. 89-91 rotors take 89-91 cw's.



i have a gsl-se motor with 89 na rotors running right now, its fine, ive had it past 8000rpms too.

[quote name='Feds' date='Apr 21 2005, 10:22 AM']Did some searching, and I haven't found a definitive answer, so...



I have a GSL-SE 13b, which I intend to rebuild with 12A irons, so I can maximize the porting. My question is: Can I use S5 NA Rotors and e-shaft? If so, what machining/balancing/weights would I need?



Has anyone done this combination before?


[/quote]





That was the setup I had in my old FB.....street ported using GSLSE rotor housings, 12a irons, S5 rotors, and E shaft, a racing beat holley intake a 600cfm holley carb, and a bunch of other stuff I can't remember anymore...car was fast....I miss it sooo much.

[quote name='banzaitoyota' date='Apr 21 2005, 02:40 PM']I just had my S5 Rotating assembly balanced. Unknown history of the parts, But I would venture a guess they were just pulled off the shelf. The builder had a "b" and a "d" series rotor. 46 Grams difference in weight. When the assembly was spun up; it was in decent balance. When the assembly was de-accelerating it was a whole nuther story, it literally bounced on the balanacer.



The poing I am trying to get across: Spend the $$$ to get it balanced. I would use:(In no particuliar order)

1. Stan at SDJ Motorsports

2. Carlos at CLR Motorsports

3. Paul Yaw

4. Rick Engman

5. MAndenville

6. Daryl Drummomd

7. Racing Beat


[/quote]



what is the average cost on balancing?



i would say try and use a matched rotating assembly out of a mazda built motor and you will be fine

Average cost he $500

I was always under the impression that just as long as the rotors were matched up and the counterweights were matched up that you would be fine i.e. S4 rotors with S5/FD counterweights. Am I wrong?