I would think a cone would have more surface area than a circle would. pi*r^2 vs pi*r^2 + pi*r*L(length of side of cone). anyways. i had a stroker 18 in a 17.5 cub box with 650 sq in of port...worked out well. This was about 2x SD on the stroker, if i remember right(was about 3 yrs ago). Also if you make a plug to decrease the port area, be careful of the tuning frequency changing. It would be easy to conclude that reducing port area increase/decrease because of the changed frequency vs resonant frequency of car and impedence with amplifiers. isnt it fun change one variable, and a million others change, hehe. thats why its always a challenge and what works for one person, wont necessarily work for another. let us know how your system comes out.
Originally posted by dwood127:
i think ive heard some guys say that you shouldnt go above 75% of sd(cone area).
also, the physical contours of the cone(concavity, dustcap size) dont effect cone area. when you measure the cone area, you the effective piston area. measure from the center of the cone to the edge, square that, then multiply by Pi. thats your cone area. it doesnt matter if the cone is flat, curved, ect.