DO this round port calculators figure in the ports displacement??

[Jeepjones85 10+ year member]

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

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[john denver 10+ year member]

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 5,000+ posts]

i don't think it does... gave me the same dims as psp-inc's calc

 

[DBBOOM 10+ year member]

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 10+ year member]

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 10+ year member]

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 10+ year member]

Ok thanks

 

[DBBOOM 10+ year member]

3.14 x 9 x 10.59 = 299.27

299.27 / 1728 = .17cu/ft

 

[Jeepjones85 10+ year member]

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 10+ year member]

Thats correct, i didnt have the O.D. of the PVC. And multiplying times the number of ports is correct.

 

[Jeepjones85 10+ year member]

ok cool thanks for all the help