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View Full Version : DO this round port calculators figure in the ports displacement??



Jeepjones85
12-13-2008, 06:12 PM
I went here http://www.carstereo.com/help/Articles.cfm?id=31 to see what size round port to use and my ?? is do these calculations include the round port's displacment?? I guess they would have to right
:confused:

john denver
12-13-2008, 09:47 PM
know they dont just use it to determine what you would need for you size box then fiqure what the displacement would be and renter that volume into the calculator after a couple times it should get you really cloose

snb778
12-13-2008, 09:51 PM
i don't think it does... gave me the same dims as psp-inc's calc

DBBOOM
12-13-2008, 09:59 PM
I followed it exactly on a slot ported 12'' box, it was right on the money. Just make sure you put accurate info in when you find the minimum port size(i.e. x-max calculator).

Jeepjones85
12-13-2008, 11:15 PM
Well how do you figure out the displacement of a round port??
It is calling for 10.59in long X 6in round @ (8.8cubic ft before port displacement)

roarzorz
12-13-2008, 11:20 PM
Well how do you figure out the displacement of a round port??
It is calling for 10.59in long X 6in round @ (8.8cubic ft before port displacement)

pi(radius squared)*length = displacement

Jeepjones85
12-13-2008, 11:57 PM
Ok thanks

DBBOOM
12-14-2008, 12:02 AM
3.14 x 9 x 10.59 = 299.27
299.27 / 1728 = .17cu/ft

Jeepjones85
12-14-2008, 12:34 AM
This is How I figured it

With this formula, Pi x R^2 x D/1728 (3.14 x Radius x Radius x Depth of Port/1728)

Im using a 6" round pvc with a radius of 3.31 port that is 10.59" long

3.14 x 3.31 x 3.31= 34.40"

34.40" x 10.59"= 364.29

364.29/1728= .210 Cubic Feet

.210 x 2 =0.42
0.42= how much total port displacement because of the two ports...

DBBOOM
12-14-2008, 12:37 AM
Thats correct, i didnt have the O.D. of the PVC. And multiplying times the number of ports is correct.

Jeepjones85
12-14-2008, 12:39 AM
ok cool thanks for all the help