Originally Posted by Stu @ M Developments
I think everyone is arguing for different scenarios now.
Maybe someone should do a summary... Hows this.
IF you design an engine that achieve a given volumetric efficiency (say 85%) at a given RPM it will make X power.
If you then change its capacity, but redesign the engine itself to allow it to still meet the same VE and RPM statistics as the first engine, you WILL make more power.
the engines are not redesigned on the example im using Stu.
If there is a restrition like a carb that is stopping the engine flow more air then I agree that no matter what you do the power will not increase.
if there is no restrction then power WILL go up.