View Full Version : aero port avalanche 18 question...

01-04-2008, 08:43 PM
i was going to build ported box for my avalanche tomorrow using PVC for the ports. no flare at either end. straight pipe.

how many and how long for a 28hz tune if the box is 6.4 cu ft. would like to use 3" or 4" pipe and i have to keep the amount of ports to an equal number...


01-04-2008, 08:45 PM

Use the calculator

01-04-2008, 08:55 PM
yeah, but this isnt for flared ports.

just trying to get someone to figured it up with non flared ports.

01-04-2008, 08:56 PM
oh, it looks like it will work for straight also...

hmmm... :)

01-04-2008, 08:57 PM
It lists two results: The port length required for non flared ports and the port length required for flared ports.

Edit: He found it

01-04-2008, 08:58 PM
i think i got it...

01-04-2008, 08:59 PM
yep, thanks... i used that a couple times yesterday and today but i forgot it had non flared lengths also...

01-04-2008, 09:43 PM
If you get some flared ends you can go with about 50% less port area:)

Try to go for about 16 in^2 per ft^3 of volume. A 4" port has ~12.56 in^2 of port area. I would try to do around 6 ports but that may be difficult with a 28hz tuning because the ports may need to be a bit longer.