No, those aren't new. They actually came out of an auto-equipped car with 100k miles on it.
I realize most people probably know that you can clean rotors, but I just had no idea how well they could be cleaned up. Carb cleaner and some elbow grease goes a long way

They looked something like this when they came out:

 

dude.... how do they work triangle shaped like that? mine are round

 

Those do look new, dont even think my low mileage jdm s5 turbo rotors look that good.

 

They were soaked in carb cleaner for about 36 hours (probably overkill), periodically taking them out to brush them to break up the carbon. Then I put them in a hot, soapy water bath to get all the carb cleaner off, then I dried them and put PB blaster on them to prevent flash rusting.
I learned about it from the Bruce Turrentine (sp?) rebuild video at www.rotaryaviation.com. Except he didn't say anything about the flash rusting....

 

nicee

 

Where are the pistons.

 

I got that far and still didn't see the second picture yet, so I thought they came out looking like the first. I was filled with the urge to cause you pain for the unfairness of the universe, considerring the lengths I go to to keep my rotors free of any kind of buildup.

Lookin' pretty though, btw

 

Great work!

 

Thanks, I get a warm, fuzzy feeling every time I look at them.
Hopefully, I can start putting the engine back together soon. Its been right at 2 years since I tore the motor apart, and I finally have the money to get it rebuilt!

I plan on having a build-up thread detailing the trials and tribulations of this car and its engines(this will be its fourth since I bought it), but I just couldn't wait to post these pics. I took them out a few hours ago and it just blew me away.

 

I found out years ago about the flash rusting. I had cleaned a pair of rotors up real nice, dried them with compressed air and put them in large ziploc bags to keep dust off them. I went to get them out to spec them a few days later and they were already pitting from surface rust, I guess just from the moisture in the air that was in the bag!....needless to say I was livid!....these days I use Vaseline or Blaster until I'm ready to assemble. Your rotors look grand. Keep us informed on your build.

 

hawwwwt.

 

Luckily I had read on the can of carb cleaner that you had to put penetrating oil on all cast parts. I didn't realize how fast it would do it, though. As soon as I dried it off with the compressed air, I could start to see a bit of rust. I immediately grabbed my PB Blaster and sprayed it down, then wiped it off and resprayed it.

 

oooh, me next...

They look great. Get em balanced!

 

How neccesary is balancing the rotating assembly if everything came out of the same engine?

 

not a neccesity per say, but mazda allows a 50gram difference in rotor weight (per rotor).

If you balance the assembly, you can really increase your reliabilty and power up in higher RPMs. Imagine if the rotors where only 5 grams outta spec...

 

mine are just as good. I'll post pictures up here soon to show you. I think they look pretty good.

 

The rule of thumb is to use rotor pairs whos weight stamp is within one letter of the other. Not exactly a true balance, but within oem tolerance.

 

Since they came from the same engine, I would hope they are within 1 letter stamp.....

 

There are plenty of mix n' match amateur engines out there. I found a few getting parts for my FC.

 

No, I was the first person to ever tear down this engine. It was still factory sealed when I got it.

Just for kicks, though, how do you determine the weight stamp? There's stuff stamped all over the place on my rotors. On one the only one I could make out was a C, but on the other I found a D and an E.

 

The weight will be on the rotor gear side only.
Thanks Robert

 

Ok, its C and D then. Thanks for the info.

 

ahhh...wish mine looked that nice. lol

 

Wow mine didnt look that nice even after putting them through a brand new parts washer. Mine were trashed too though so it didnt matter.

 

Well, a parts washer only does so much. I ran it though one too, and they still looked brownish. It took actually soaking them in carb cleaner to get them this way.