I have 4 high compression rotors, judged by the depth of the combustion pocket, that I'm trying to identify as 9.7 vs. 9.4 rotors, but am having trouble doing so by weight.

The weights in grams with stamped weight code are as follows:

Rotor 1: 4449 A
Rotor 2: 4458 B
Rotor 3: 4453 A
Rotor 4: 4389 B

These are only the rotors and bearings. No side, apex, oil control rings, etc.

Based on the following link:
https://www.mazdatrix.com/faq/rotorwgt.htm

The 9.4 should be 5253 - 4553
The 9.7 should be ~4328

I have many 9.0 rotors which are all coming in at ~4320

Thoughts on what the ~4450g weight rotors?

 

.....width of the bottom of combustion pocket......

 

When measuring the bottom, ~23mm, I'm running into a bit of uncertainty, +-1-2mm, due the curving of the edges. The reason the amount of uncertainty, while small, is becoming a problem is because the width doesn't appear to be that different than the 9.0 pocket, but a different dept and generally shape.

Maybe that provides the answer?

 

The s5's are machined chambers versus the s4's that are cast.