Hello Rob and thank you for the post, sorry for the late reply
I have to be honest here, before I can assist I have to research your question!
Initially I am intrigued by the "Kistler Cylinder Pressure Sensor Trace", could you post your psdata file here for all to see and share?
Could you provide details of the engine under test so I can begin to research what we are trying to achieve?
I understand we want to calculate the IMEP (Indicated Mean Effective Pressure) from your sensor and this will be my initial focus.
Thereafter determining the area will be my next project.
I look forward to your reply, take care......Steve