just wondering. gotta replace them and wanna make sure before i do.

 

The slaves are different. I believe the masters are the same.

 

You are right, the masters are the same and the slaves are different.

 

thats what I thought but the parts store is telling me they are both the same.

 

DING DING DING..

correct

slaves are different between turbo and na (seires does not matter)
masters are same ALL FC turbo AND n/a

 

most of the time parts stores are idiots the slave mounts differently so they are different.
they are however the same bore size so you could easily buy a rebuild kit for the slave and fix it that way. and just get a small brake cylinder bore to clean it up.

my advice find another parts store.

 

Yep. I remember a store insisting my friend needed 8 spark plugs for his TII.

 

yep the price of slaves are cheap enough to buy a new one and just replace it..

just make sure u get the correct one.

 

Yup. I bought rebuild kits for my slave and master. The bores were pretty corroded and the new parts would not seal. The bores needed honed, so now the job isn't any cheaper and I still have used parts.

I ended up buying new slave and master, worked first time.

Buy the new Slave and Master, not the rebuild kit.

 

^ Good idea.

The mounting bolts on the cylinder are located in a different place, but other than that they are the same. Therefore, the rebuild kits are the same, but the fully-assembled parts are different.


< NA - TII >

 

Autozone sold me a na slave, and i ruined my act t2 clutch by the time i noticed it was sliping that bad.

 

what about the rubber line from the slave to the metal formed line that meets at the firewall?

those the same?

 

Those are the same.

 

Mazdatrix sells a nice stainless steel hose for about the same price as the OEM hose:
http://www.mazdatrix.com/f-hydral.htm

 

If you match up the mounting holes, you'll see the pushrod is in the exact same location on both as well. In terms of physical mounting and length, they are the same, but the TII one (F044 part) has a longer body than the NA one (FB01 part) when measured behind the mounting ears. Considering how both use the same rebuild parts, it makes me wonder if there are any functional differences at all.

I am not an expert in fluid dynamics by any means, but if the SC's bore is the same and they both use the same MC, it means that both F044 (TII) and FB01 (NA) slave cylinders are moving the exact same distance when the clutch pedal is pushed.

I have mistakenly used a NA slave on a TII clutch and it does work. However, it was an unknown brand and unknown condition slave cylinder which failed recently. I would presume its failure was due to the extra load of the ACT HDSS clutch and that it was not a Mazda slave cylinder. Would I knowingly do so again? No, but I think there is a perfectly logical reason for the extra volume in the F044 Slave Cylinder. Otherwise, Mazda would have used the FB01 version on all FCs to reduce costs.

A stock S4T2 pressure plate requires 1232 lbs of force to be disengaged, while a S4NA one needs 1078 lbs. In all, the Total Assist Ratio for the entire clutch system is about 36:1 (6.25 for pedal, 1.44 in hydraulics and ~4 on the clutch fork). Since the SC travel on both NA & TII are presumably the same, the TII would require more force on the pedal than the NA does. NA needs 30lbs, TII needs 34lbs.

Since they both use the same FB01 Maser Cylinder (0.625"/15.9mm bore), the same FB01 Slave Cylinder Rebuild Kit (Piston, Spring, Seal & Boot), the same pushrod (H005-41-341), have the same 0.75"/19.05mm bore and the same stroke length based on the mounting ears' position. All of the parts related to the Master Cylinder and Pedal Assembly are identical between the two as well. The only differences between the two systems are:

Hardline (yet the fittings are the same)
Flex Hose (yet the fittings are the same)
Hardline to Flex Hose Attachment Bracket on Firewall
Slave Cylinder Body (yet the fittings are the same)

So my question to the community is: What is that extra volume on the TII F044 Slave Cylinder used for?

 

interesting, knew they looked different never actually attempted to use the wrong one, and see what happens