front iron

(its supposed to be from S4 NA, but white plastic ring around o-ring is confusing me - anyone got pictures of S5 NA front iron for comparsion?)

http://rx7cz.net/photos/workshop110/IMG_4305.JPG
http://rx7cz.net/photos/workshop110/IMG_4306.JPG

rotor

(look closely at its surface, i am used to all rotors being smooth face, this looks like machined - dimensionaly it looks like S4 NA, but that finish is confusing)

http://rx7cz.net/photos/workshop110/IMG_4301.JPG
http://rx7cz.net/photos/workshop110/IMG_4302.JPG

Thanks for any input.

 

The plastic ring is there to fill in the gap. Some of the housings were casted different and if the o-ring is used by itself, it won't stay seated properly. Mazdatrix web site has an explaination of this.

 

I'm betting it's S4 NA. The rotors look correct, and the iron looks correct. Some of the S4 irons were made to use the teflon ring (mine included).

A pic of the ports would clear it up. The S4 Aux is smaller then the S5.

 

I read that the TII and N/A rotors had different patterns in the bathtub area. I think it was Kevin Landers who posted that so send him a PM about it.

 

The S5 NA rotors have machined bowls, the S4 are cast. Easy way to tell.

TII bowls are deeper then NA.

 

Yeah, but this is machined FACE or rotor, bowl is cast and depth of bowl is small (NA).

 

bump, anyone???

 

Looks like any other NA/TII rotor I have seen. All the faces are smooth, with that look.

 

Check out the post from Wankel7 on the same subject about the rotors. Ddub has a post for the oil gaskets......that has a link to the Mazdatrix websight.

 

This rotor is NOT SMOOTH, thats whats strange!

As u know S5 rotors does have machined bowl. This one has same machining on all tree faces, not in bowl.

Its not like any other rotor i have seen (and i have S4 NA, S4 TII and S5 TII rotors to compare with)

 

Its kinda hard to tell with all that carbon everywhere. They need a good soaking.

 

My S5 NA rotors look identical to what you have there.

 

would you happen to have pictures (detail of surface) ?

 

my s6 were like that also. It's normal.

 

The rotors look exactly the same as all the other rotors I've seen. It's hard to tell from the angle of the picture (and my monitor is dark), but the surface of the rotor appears smooth, and the bowl appears cast. Exactly what I would expect from any year of rotor.


What's different? Can you take pictures of the two side by side...

S5 TII rotor:



S4 NA rotor:



The face surface is the same.

 

You guys must be blind or have really blurry monitors

Look at this picture and tell me you don`t see grooved surface (rought machined finish)

 

But it's the same surface I see on all my rotors.

 

All other rotors i do seen have no machined grooves which you can feel, they are smooth, flat on the face.

 

hIGGI; seriously man the rotors i have lying on the floor in my room look just like that. I pulled the out of a dead S5 NA engine. I'll post pics when i get home if I can find the good digi cam.

 

so is it an s5 NA rotor? this is wierd

 

pretty sure I've seen both on s5.

I think just like the injectors for the 88 they switched rotors mid s5. Therefore some s5 and all s6 are like that.

 

i was told Kevin Landers said something like those grooves are totally random (so it could be S4 NA rotor as it should be)

 

First, all s5 and s6 front irons have the larger casting, which prevents the oring from blowing out and losing pressure. Any front iron with the small casing is 88 or prior.


About the rotors, here.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/rotor-damage-other-pics-toasted-some-questions-394476/

The machning on the face is pretty random, I guess a quirk of the manufacturing process. Even though it's mainly s5 and s6 rotors that you'll see that on, I've even seen s4 turbo rotors with that grooving...I figure it's a late 88 or so, right as they were switching to the s5 rotors, and some of the newer equipment got installed ahead of time. Until someone who has firsthand production information comes forward, I'd just ignore any grooves on the face, and operate solely on the basis of rotor weight and compression pocket.

Heh..you guys wanna hear some bullshit? Okay, we all know that s4 rear irons (on turbo motors) are known to crack at the rear dowel under high power/load situations. And that mazda fixed this to some degree on the s5's, making a reinforcement there as well as the surrounding material thicker. You can also tell an s5 rear iron by the larger temp. sensor hole, and the 1/8" larger intake port.

So here is the odd part. I've taken apart several jspec s5 cores that do NOT have the reinforcement on the rear iron. That aspect looks just like an s4 iron. But, you have the larger temp sensor hole, and larger intake port runner. Wierd huh. Better yet...I've seen s5 rear irons that did have the reinforcement, but not the thicker material...the casting was the same size as the s4, just with the little triangle reinforcement cast in. And then I've seen s5 rear irons with both the thicker casting and the reinforcement.

And, to add to all that, let's talk about s4 rear irons. 86 and 87's (up until sometime in early or mid 88) had a small hole for coolant temp sensor and no reinforcement at the dowel. However, I've seen a few s4 turbo irons that had a reinforcement on the dowel...still the thinner casting, but the reinforcement was there. And some of the 88 irons have the small hole for temp sensor, some have the larger hole for temp sensor. Why this is, I do not know. I guess mazda just liked to change **** at random...one would think this would be costly.

 

thanks for answer Kevin, its quite hard to find someone here who understand question and/or is not blind

 

heh...no problem.