Seriously, the only way to identify them is by measuring the depth of the compression chamber? It seems to me there has to be a better way....

Anybody know?

I've got 2 rotors laying around and I know one is from a T2 and the other from a NA, both were S4's .

On a side note, E shafts don't differ do they?

*Edit: Fail on spelling SEARCHED*

 

They are not marked any differently, so how else can you tell?

Bumps are illegal in this section.


-Ted

 

S4 rotors have a rough cast appearance in the "bathtub" part of the rotor (the combustion chamber area). The S5 rotors have a distinct machined appearance in the same area, sometimes with noticeable lines across the width of the rotor.

 

he needs the difference between turbo an n/a, not s4 or s5

 

That's...my.. question?

As for the bumps, I disagree. Its easier than clogging the 2nd gen arteries with useless 1 post threads for future searches.
I was afraid no one would see it being that it was on the second page this morning already.

I was able to find that out in another post. I'm just not convinced (seeing as how I work at a small engines plant and we label everything because we have 50+ variations of the same engine) that the only way to tell 1 part from the other is a guesstimate measuring of the combustion area depth.

 

I really don't care if you disagree...

https://www.rx7club.com/announcement...ouncementid=92
Please do not bump your post. Bumps will be deleted.
Bumps, TTTs, ^s, etc are no longer allowed in the 2nd gen section and will be deleted when found by a moderator, super moderator, or administrator.


The rules were not made by me.
I am merely pointing it out to you, since you don't seem to be familiar with them.


Well, let me tell you how Mazda Japan does it...
"Big" engines (internal) parts are individually bagged with their appropriate, unique packaging - i.e. boxes, plastic bags, etc.
The parts need to be removed from the packaging and installed / assembled to build the engine.
Once the packaging is discarded, there is no way to tell you what exact part number it is.
If the assembly personnel were very meticulous about keeping parts where they should be, there should be no mix-up of parts with this procedure.

The depth of the "bath tub" depression is unique and consistent for each series and non-turbo versus turbo.
If someone has these numbers laying around, it's very easy to compare.
Production variances are very tight, and I doubt you'd be a difference even measuring down to 0.001".
Now it's just a question whether someone can offer these numbers or not...
Staring at the rotors themselves will not tell you where they came from, period.


-Ted

 

Touche


I assumed this is the way it was done, with the exception that we etch each part number on our major components.


I saved the search, so I've got the numbers. I was just hoping one of the (japanese ??)symbols on the rotor might have something to do with it.

 

The Japanese characters (they are "katakana" characters) just denote the sideseal positions.
There are 3 on each side.

There is also an A / B / C / D / E stamp to denote rotor weight.

In the apex seal corners, there is an "S" stamped there.

There should be no other stamp other than those?


-Ted

 

Yes, as far as I can recall (parts are 75 miles away) that should be all the characters on them.

I read about the rotor weight already, which is quite interesting i must say.

As for the side seals, those are just used to mark the seals upon taking them out correct? There isn't (when using new seals) a specific seal for a specific location.
(forgive me I've only taken apart 4 motors and put together 1)

Is there any signifigance to the "S" stampings?

 

That is correct.
Use the markings to keep track of the original seals when reusing them.
If you are using new side seals, you need to "clearance" each side seal for each position.


Not that I can thing of - maybe someone else knows?
They just seems to mark the positions where the rotors are milled for balancing...


-Ted