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Pressure Volume Cycle: point 5 BDC or EVO prior to BDC

EFI Tuning Fundamentals

Discussion and questions related to the course EFI Tuning Fundamentals


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In regards to "Pressure Volume Cycle" video in EFI Tunning Fundamentals.

I am not trying to be picky regarding the animation of BDC and EVO for point 5 but I am trying to assure that I am applying previous lessions correctly.

The video shows point 5 at BDC where the cylinder contains exhaust gas until the exhaust value opens and the pistom begins the exhaust/blow stroke. I am assuming that in reality point 5 occurs before BDC since the previous video emphasized "value timing events".

Am I on tract?