I made a mistake. I posted this question on the 'other' forum and did not get a good response, so let me ask the veterans here;

What is the difference between the s4 and s5 N/A clutches? The diameters are the same and i thought the trannys were too. Well, if i had an 86-88 engine and tranny with 89+ rotors and flywheel which one should i use?

If your using the s5 flywheel, I'd go w/ the s5 clutch. I don't think that a s4 tranny will have much trouble dealing with that....just be sure to use the correct throwout bearing, etc that comes w/ the new clutch. From what I can see, my s5 T2 tranny and my s4 NA tranny look a lot a like as far as clutches, input shaft, etc would be concerned.

This is what mazdatrix says in their website about turbo clutches.

http://www.mazdatrix.com/f86-92tb.htm



So i'm guess this might be the deal with the N/A clutches.

Try calling mazdatrix.



C

Well, I thought the only difference could be the number of splines. can you verify that rotaryman88? I am almost certain the diameters are all 225mm.

You MUST use the 89-91 flywheel, as well as the matching front counterweight. All 2nd gen NA's have the same number of splines, etc.

Well the mazdatrix site lists the same pressure plate for s4 and s5 aftermarket clutches. The discs are different, so i am guessing the s5 one is sturdier and not much else.

S4 clutch since you are using a S4 tranny right ?

I can check the splines tom(night now)...but I dunno if that'll figure out an answer since one is a t2 and the other is an NA, but I'll check...I'll take some up close pics too if you think it will help...

Yup, I have the 89+ flywheel and front counterweight. So what is the consensus opinion, s4 or s5 clutch?