What size engine for the online/Youtube EC?

Bottom line is nobody knows what the "challenge" is... neither has the op responded although it shows he's been on this thread. Could be another thread to induce bickering ???? Maybe he'll chime in yet.....
I haven't responded because I was giving the poll time and there was nothing more to say, I also have a full time job and hold down the machine shop with all my free :rolleyes:time. The challenge will closely follow the way its laid out in the link only hopefully simpler , maybe you haven't seen it. Bickering? Have at it--won't be with me. J.Rob