Well, here are the pictures from my rotors. Got a few questions:

What is the deal with this. Grooves on one fast but not the other? Both machined holes have the groves.


Here is my front rotor...it didn't have a seal failure but has a ******* hole in the rotor face. It pushes out slightly on the rotor side.



Random ding on the front rotor:


Here is the rear rotor damage. Yeah, it looks like a nut hit it. I can promise I didn't do that. My turbo still worked. I would guess a nut of that size would have destroyed my turbine blades:

Profile view of that damage right at the edge of the rotor:


Here is the tip of the rear rotor apex grove: Maybe you can use it if you milled for 3mm?

 

Yeah, some random pics



Teh beer

BNR 3


New housing in teh plastic


Coffee ?


The bench


Woot

James

 

Wow, those rotors have been around the block. How long did you run it with 'em?

I don't know what the deal is with the grooves. I've only seen one like that. I suspect a slight casting difference.

Fat Tire is good stuff.

Looks like you've got some nice parts for the next build.

 

They sure have

I had 11k on the rebuild before it blew.

Reasons I think it blew. No camfer on ported exhaust ports and detonation.

Who knows at this point. I am just not happy with what I have found in that engine.

ALL of the oil control rings were way out of spec. At least .04-.05 of the silver was showing on all of the rings.

James

 

I don't blame you a bit. Those are display rotors that ended up in your engine.

 

That bolt impression doesn't look like a bolt head. Could it possibly be part of an apex seal?

 

Sure could be....half of teh seal did fracture and leave the enigne

Hell, the thing I cant figure is how little damage the seals did on the way out. How it could have left that big dent.

The rotor housings were fine. The side housings are fine.

The rotor housings didnt have one scratch that would catch a fingernail.

James

 

Man, im really surprized that the side housings were fine, considering that nice ding on the side of that one rotor.

Personally, I would throw that rotor out and buy a new or used one. Its fucked in my book.
If you don't have the cash, IMO its worth the wait saving up for the new one.

 

The rotors are a softer metal. Take a hammer and tap the apex groove of your trashed rotor and see how it deforms. The chrome surface on the housing is very hard. The seal piece probably got swept around inside and when it hit inner point of the housing, it got pressed into the rotor face.

The random ding in pic 3 looks like it matches the ding in pic 5, they may be register marks from a previous build.

 

So what is the deal with the groves on rotor and not the other?

James

 

Mazda comp seems to think it is two different year rotors.... s4 and a s5.

James

 

is there any visual difference in s4 to s5 turbo rotrs??? i know that na rotors are way different from s4 to s5......

if they are from different years, isnt the compression slightly different?? if so, wouldnt the motor run terrible, if at all???

 

beats me on the difference. I haven't been able to find out ... still searching.

James

 

yeah, compression is different, and the weights between S4 and S5 are different...seems like it would not be balanced either... WTF?

who built this motor?

 

RETed just told me the rotor on the left is a FD rotor and the right one is a S5 rotor. Same compression same weight. I guess all is well.

As a result of the damaged rotors I am going S4 rotors. Why? Availability

James

 

Brand new rotor housing? So jealous

Are you using s4 TII rotors or NA?

 

Hey Woody, Where's Buzz???

 

 

I have to disagree with both. An s4 rotor would have totally different casting for the compression dish...it would have random pits, instead of precise lines. And an FD rotor, is effectively the same as an FC rotor, but the dish looks a little different. On the FC, you can see how the corners are rounded off, to look like an oval. ON an FD, the corners are almost pointed...to resemble a rectangle more. Those are both s5 t2 rotors. The grooves on the face are insignificant...I have never heard it explained why, but you see one with the full face having grooves every once in a while...doesnt affect it's usefullness at all.


Those dents in the rotor appear to be from a stock 3pc seal...which you did not have. The rotor was reused from another engine that had blown apex seals, of this I'm 95% sure. Now, this is not really a great thing to do, but it isn't uncommon, and it isn't really that bad, either. Assuming all the seal grooves are still within spec (or can be filed lightly to be put into spec, in the case of the apex groove) then dents on the rotor face have absolutely no impact on the compression or other aspects of the engine. All the rotor does is house the seals, and give the combustion chamber a 4th surface. IF the rotor grooves can properly house the seals, then there is no problem. IT'd be just like having a scratched up piston...so long as the rings sit properly in it, and there are no holes all the way though, it is fine to reuse. Now, again, I'm not saying this is a great thing to go around and do when building engines...but it's not as bad as building one with shitty HOUSINGS.

 

.... and Kevin has spoken thread done

Thanks for the run down dude...

What you said is exactly what Mazdatrix said.


Hey Woody, Where's Buzz???

Oh wtf...I don't look like him... do I


James

 

Oh , I am using S4 TII rotors.

James

 

Hmmm...I always thought it was milled tub + milled face = FD rotor.
Milled tub only = S5 turbo
All cast - no milling of tub or rotor face = S4 turbo

I dunno where the Cosmo stuff slots into all of this though.


-Ted

 

Sorry James, its just the pose with the expression. You could take any thin dark haired guy and pose him like that and tell him to make that face and HE would look like woody as well. I just took the opportunity to be a smart ***.

 

Sounds like it is write up time for you page man I case there isn't enough on their already!

James

 

Dude, its all good cause it was funny

James