Why would engine designers opt to include more cylinders in an engine instead of increasing the displacement?

Question

For example, why would a car manufacturer opt to to use a 2.0L in line six instead of a 2.0L in line four in a vehicle. Are the benefits of including more cylinders in an engine worth the added complexity?

In: Engineering

Answer 1

Good answers in the other posts. I have also read of “cylinder filling” being an issue when you want maximum efficiency.

Ferrari’s first V12 was for the 1.5L class, very tiny.