How to determine wankel engine pressure p1,p2,p3

[usewf]

i want to calculate the torque vs crank angle for wankel engine...however i get stuck on entering the pressure value which is p1,p2,p3...how can i determine the pressure value?

 

[xxChrisxx]

You might have a problem applying the PV diagram for an ideal cycle to a wankel rotary. Although the 4 'strokes' are the same and are governed by the same rules, the 3 chambered rotary will require assumtions that deviate quite a long way from a piston engine.