@NickT: I think you are confusing Ciro Pabon and Ciro Pabón...
Sorry, mates (Nick and NickT), never again.
I agree with your 4 cycle-observation on the 6-cycle engine MC posted. I spent 15 minutes trying to understand if the piston moved 4 or 6 times. It seems as if the article says that the TDC and BDC at ignition/combustion can be prolonged because you can make a flatter "cam" but I fail to see if this is an extra-stroke of the piston. Please, take me out of my misery: is NickT ok?
@Manchild: Thanks, man. You rules. I have to confess that much of the fun I find around here comes of your wonderful posts.