Yes the Honda PGMFI has a knock senor as part of the control inputs. As Joe mentioned the anti knock senor will stop detonation if low octane fuel is used. I would imagine the AT has a fair bit of cylinder pressure in lower rpm's and with load could have detonation issues compared to a engine with more radical cam profiles. Very well designed engine we have i believe, 10:1 static compression and makes more torque than a V engine of the same size that has to run 13.5:1 to make close to the same power. The AT engine has so much more potential than that V engine. Basic layout of a PDF i have here.