Here's my perspective:
The 13B will displace 1.3 liters per revolution, it will take 3 output
shaft revolutions to cycle all the chambers and end up at the starting
point. It displaced 1.3*3 liters in the 3 revolutions.
A Vet will displace 5.7 liters in 2 revolutions, it takes 2 output shaft
revolutions to cycle all the chambers and end up back at the starting
point.
If you want to compare displacement using the piston equivalent
(displacement per 2 revolutions) a 13B would displace 2.6 liters.
The rotory design can achieve higher rpms than a piston design so maybe
a 13B is better than 2.6 liters (piston equivalent). On the other hand,
the odd shape of the rotory combustion chamber will cause it to be
thermodynamically less efficient. So I say keep it at 2.6 liters.
A pressurized rotory will act the same as a pressurized piston motor, so
multiply by 1.4. That's 3.64 liters.
Regards,
Bob Mosso (add smiley faces as necessary)
'81 CSP RX-7
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