Does anyone know the chamber volume area 12A,  if the 13B is 40

cu.

ins.
George (down under)

Hi George; The Chamber volume multiplied by the ratio of their widths

should

give it to you: 40 X 65/80 = 32.5 cu in or it 21st century terms 654

cc X

65/80 = 532cc  BR, Dave McC

Hello Dave,
Thanks I didn't think of that one, but I did it another sneaky way and got
35 cu ins.
I just did it your way and got 35 cu ins as well.
I used the motor capacity the local Mazda shop gave me, 1146cc for the 12A
and 1308cc for the 13B.
It seems we disagree on the 12A size,  I will have to check this up!
George (down under)

If you are looking for the total CFM you need to double this number
to make it equivalent to a four cycle piston engine. Then you can use
this chart from Hugh Macinnis book "Turbo Chargers"  to determine the  NA airflow 
requirements at 80% vol. eff. Than add 20% for 100% vol. eff or add 40% for 
120% vol. eff.. 120% is typical of a good P-port rotary engine with the right 
diameter and length of intake pipe and for any RPM.


Paul Lamar 

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