andym85 Posted July 9, 2007 Report Share Posted July 9, 2007 to clarify: to find area: pi*r^2 (or pi*r*r) to find volume (displacement): pi*r^2*h (or pi*r*r*h)...h=length of the port example: one 6" port that is 10" long area=3.14*3^2 area=28.26sq" volume(displacement) =3.14*3^2*10 volume(displacement)=282.6cubic" volume(displacement) in terms of cubic feet = 282.6/1728 = .1635cft Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
andym85 Posted July 9, 2007 Report Share Posted July 9, 2007 more clarification..lol here is a pic. the red is port area, the blue is volume (displacement). now SURFACE AREA would be the actual physical surface of the black tubing that u can touch, but that is not volume or displacement, displacement is the volume of the air inside of the tube! Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
emperorjj1 Posted July 9, 2007 Report Share Posted July 9, 2007 i think everyone here is looking for the volume of the port... for tuning Quote J. JMy CardomainFINISHED COBALT SS/SC DUAL ALTERNATOR PICS theres no such thing as too expensive when it comes to upgrades like that, because imo if you are gonna spend to upgrade then do it correctly rather then be a cheap ass ricer Link to comment Share on other sites More sharing options...
andym85 Posted July 9, 2007 Report Share Posted July 9, 2007 (edited) ok ok...i think we are all talking about the same thing. volume is for displacement, but it is also in the equation to figure tuning (the one that i use anyways) and i think that is where we are all gettin confused with each other. here is the equation i use (it looks a lot more complicated than it really is, especially if u arent good at math) Fb = .159*((Av(1.84*10^8)/(Vb(Lv+.823*Av^.5))^.5 Fb = tuning frequency Av = vent area Vb = net volume in cubic inches Lv = effective length of vent effective length = physical length + end correction <---1/2 of the ports width so u need both the port area and the port volume for this equation, but NOT the surface area. any help? oh, and in the equation when u see ^.5, that is just another way of saying the square root...that is how u have to do it in excel though. Edited July 9, 2007 by amatt85 Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
babyjoker Posted July 9, 2007 Report Share Posted July 9, 2007 (edited) since this on topic, how many aero's would ya recommend, (for both 4'' and 6''), for an 18'' ssd? Edited July 9, 2007 by babyjoker Quote 1999 Eclipse N/T 12'' Fi BTL Gp3000d PM D3100 Link to comment Share on other sites More sharing options...
andym85 Posted July 9, 2007 Report Share Posted July 9, 2007 i would say at least two 4" or one 6"...maybe more.. Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
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