Precision Ports

[Btrash]

4/2=2

2^2=4

4*3.14=12.56

12.56*2=25.12sqin

which supposedly is equivalent to 50sqin slot or square ported becuase of the decrease in port velocity due to the flared flanges

13.71" with flare for 2 4" aeros for 3cuft external port

Shouldn't you use 2*pi*R for circumference and not pi*r^2 which gives area? The answer in this case is the same anyway since 2^2 = 2*2 (It is port surface area and not port volume correct?)

[Derrick824]

http://www.psp-inc.com/

They have a port calculator on their website in case you ever need it.

[Decaf]

Shouldn't you use 2*pi*R for circumference and not pi*r^2 which gives area? The answer in this case is the same anyway since 2^2 = 2*2 (It is port surface area and not port volume correct?)

its not volume... i only multiplied two things pi * radius squared... i would then have to multiply by height for 3 dimensions or volume

i learned it as circumference is pi*d

area pi*r^2

volume pi*r^2*h

thats the calc i used... at psp-inc.com

[01 S-10]

http://www.psp-inc.com/

They have a port calculator on their website in case you ever need it.

I tried it with 3 and it says over 21 inches to get 38hz

[Decaf]

I tried it with 3 and it says over 21 inches to get 38hz

yes... the more surface area the longer

i said 13.17 for 2 4"

so 3 4" will need to be longer

and 1 4" will be shorter... ya dig

[01 S-10]

Thanks for all your help guys I think I'm gonna try 2 of them and see how it sounds

[Decaf]

the lower u tune the better off u are with less port surface area imo