aero port avalanche 18 question...

[tremor1127 10+ year member]

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...

thanks...

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[SeanDub 10+ year member]

http://psp-inc.com/

Use the calculator

 

[tremor1127 10+ year member]

yeah, but this isnt for flared ports.

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

 

[tremor1127 10+ year member]

oh, it looks like it will work for straight also...

hmmm... //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[SeanDub 10+ year member]

It lists two results: The port length required for non flared ports and the port length required for flared ports.

Edit: He found it

 

[tremor1127 10+ year member]

i think i got it...

 

[tremor1127 10+ year member]

yep, thanks... i used that a couple times yesterday and today but i forgot it had non flared lengths also...

 

[Lakota 5,000+ posts]

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.