roblem with case(331) two stroke loop scav
 

Having problem with case(331) two stroke loop scavenge cycle 3D

hai, i am currently trying to understand the q1 file of case 331.I am planning to modify this case to simulate a piston pump.just pumping natural gas from one inlet then to one outlet.the transfer port will be the inlet and exhaust port will be the outlet. This is some of my problem. 1)VOLF, WHAT SHOULD I PUT HERE?? 2)in the code it says **exhaust port opens at 70 deg BBDC A1=-70 this one i think i know what is going on but the next line is **end of simulation 1 deg ABDC AN=30%