Long story short (cuz it's 2am)


I have 2 REW's

1 is an old motor.. (S6 motor)

1 is a Reman made in 1999...

the rotors look diff...

the newer one is on the right.. the old model on the left...

it seems to newer ones are much less machined for balancing.. (does that mean they're made better? or mazda cared less about balancing them)

they also seem of a diff material.. the older ones have a yellowish pale tint and hue to them.. almost like a peeling Clear coat/plastic...

the newer one seems to be a steel/gun metal grey

 

8 hrs and not a single reply?

i know i'm not the only one to open a few motors on this forum lol

 

Theyre the same. Each rotor has its own unique balance drilled holes due to the way material settled during mass production, and then later balanced tip vs tip. For unexplained reasons you'll also see differing colorations and what appears to be heat marks in the metal once cleaned. This is normal and acceptable. You even sometimes see rotors with smooth faces, and rotors with machined/grooved faces (like the grooves in the compression dish) in the same original mazda japan built engine. As long as the compression ratio and weight codes are compatible there will be no issues.

 

Stupid firewall blocked the pics, so I can't see.

 

Just make sure they are a casting letter matched set. Find the letter stamped on the rotor, and make sure they are within 1 from each other. So you can have a C and a D, but you dont want an A and an F. Aside from that you should be ok. If it turns out you do have a badly matched set like A and F then you should get your rotating assembly balanced or find somebody willing to trade a rotor.

 

Uh, there's no such thing as an F...it goes A through E.