QUOTE(ndfrigi @ Mar 25 2019, 04:09 PM)
so if the engine has a carb cam, F.I. totally will not work anymore?
Not for smooth transitions of power.
Cams have a particular profile relative to its use, FI cam lobes are shaped differently than a carb cam.
Carbs rely on vacuum to meter out fuel, while FI relys on vacuum the deliver air while a computer decides the fuel mixture.
The difference in what is being delivered and how determine shape of the lobe.