| He means place something at the side of the bellmouth, where the radius is, not in front of it.
If you can get hold of a copy of David Vizards book "Tuning BL A series engines" its well worth a read. He did a whole series of flow bench tests whith various configurations of flat edges, radius etc and it clearly shows that the shape at the edge of the intake is critical to the airflow peformance.
Hope this doesnt breach any copyright!! |