so I'm in the process of designing a pipe for my Gilardoni and I was wondering if anyone knew what exactly this is asking for. The Program is the Free MOTA download and I know all of the other measurements but I want to be sure about this one:
"Exhaust Port Opening Angle (deg ATDC) _____"
what exactly is it asking? the total angle of the exhaust opening period? the open period After Top Dead Center ? Please enlighten me!