Re: Is Port Energy validation just around the corner?????
Posted: Sun Sep 24, 2017 11:40 am
Correct me if I am mis-enterpreting the situation but I seem to remember that if the air is accelerated a little downstream of the point where the pressure wave was created the amplitude drops as the velocity increaces and the frequency becomes longer. This would mean a port big and lazy for 4000 rpm would sustain whatever pressure waves were generated. The key here would be generating them in the first place. Secondly as the velocity, for about the same amount of airflow, increases so the port energy increases as the square of the velocity.
As far as upping the ramming pressure at the end of the induction stroke a high energy port concept delivers an increase AT ANY RPM.
A word here on the pressure going up as the air slams into the back of the valve. Yes it does do this but that pressure energy is hardly utilized and then only possibly minimally in some part of the next induction cycle. WE have to look at the gap between the seats as a flow restriction and that we are going to utilize the change of kinetic energy into pressure energy during the closing phase to increase the port side pressure pushing the charge through an ever decreasing gap.
For those still doubtful imagine the closing gap is ballistic gel. The higher the energy of the bullet striking it the deeper the penetration (for a given calibre)
DV
As far as upping the ramming pressure at the end of the induction stroke a high energy port concept delivers an increase AT ANY RPM.
A word here on the pressure going up as the air slams into the back of the valve. Yes it does do this but that pressure energy is hardly utilized and then only possibly minimally in some part of the next induction cycle. WE have to look at the gap between the seats as a flow restriction and that we are going to utilize the change of kinetic energy into pressure energy during the closing phase to increase the port side pressure pushing the charge through an ever decreasing gap.
For those still doubtful imagine the closing gap is ballistic gel. The higher the energy of the bullet striking it the deeper the penetration (for a given calibre)
DV