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

Paul,
Understood and thanks.
Strange as it may seem, I used to look at these charts and say
%&^$#@#$ is that!

Now believe or not, I'm just starting to understand a few of them.
George ( down under)

 
The Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2004 All world wide rights reserved.