Here is a Quote from Data Crazed Individual see if he knows who he is...
BDC volume is 654cc or there abouts per chamber for a 13B and it is very possible to achieve Ve's in the region of %120 or greater. (And yes this is pure VE, not boost added as some people do!)
There are very many variables to calculation the flow rate through any given rotary engine or ANY engine for that matter.........good luck to anyone trying :wink:
The variables you need to account for are as follows.
Capacity
RPM
VE
Barometric pressure
Air temperature
Boost pressure (If not NA)
IC eff (If not NA)
Compressor eff (If not NA)
All of the above will let you work out the actuall flowrate through the engine BUT you will need to know the effect of exhaust restriction on VE and what base line VE's apply to certain RPM ranges for certain engine combinations........ Things like porting type, size, End plates used (if side ported), Intake manifold design, throttle body size, the list goes on and ALL can have very huge effects on the VE and hence change the flow calculation massive amounts.
Every engine is different, and no generalizations can be made as variations by certain builders make huge differences to VE @ certain RPM ranges.
Once you figure all this out
Then if you know the BSFC (again cant use generalisations here) varies based on porting type, engine health, compression ratio, Engine/turbo mechanical efficiency, Injector location and function (fuel mixture) & the a/f ratio you can figure out how much power that engine will make.
BSFC
A/F ratio
You will need to make a "look up table" of some sort to relating BSFC to A/F ratio which will give you the relationship needed to give a real accurate power calculation.
Have fun with the formulas. Good luck finding the data