Ralph,
have you you run both those engines on the same prop, fuel and plug? Say an 11x9, 11x10 and 15% Omega fuel?
That would be an interesting comparison - see how much more muscle the 80 has. While it has 20% more capacity, I bet it only increases in power by less than 10%... But..., 1400 rpm is nothing to sneeze at.
I wonder if the Racing 80 has more muscle than the Speed/13? It should, but does it?
I hope you're running a spreadsheet with all your tests and results! For the rest of us to refer to... ;-)
David