how does the shape of intake pipe affect power

an example:
b series motor with side throttle body and intake pipe is shaped like S or C or any other shape

then going from flat (oval) pipe to round of same diameter.


I know straight pipe would be ideal I just couldn't find much about how different bends and shapes affect airflow entering the throttle body(velocity and volume)

for example the k vs b series intake manifold

the airflow in b series manifold is more like S shape where k series is more C shaped path from plenum to cylinder.

I know theres mathematical terms for those but its been a while

 

What you are asking is Fluid Dynamics. Google that, and you will have more to read than you ever thought possible.

 

ah ok I guess I didn't know what to search for thanks
fluid dynamics is a general term tho is there something more specific I should search?

 

"Intake maniflod fluid dynamics" seems to come up with some relevant results. Here is a nice video on the subject: