help me with aero ports

[shields 10+ year member]

my box will be around 5.6 cubes net its for four mach five ixl 12. Would three four inch aero ports be enough port area tuned to around 33.

for slots mach 5 recommends 20 sq in for 1.4 cubes. so if my math is right that is around 14 sq in per cube but i didnt know on aeros?

thanks

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[Slo_Ride 5,000+ posts]

one 4" aero = 12.56 quare inches

 

[Slo_Ride 5,000+ posts]

Two 6" ports would work

 

[Slo_Ride 5,000+ posts]

If your using true aero ports not pvc or round pipe, each 6" port would need to be 21.6 " long for a tuning of 33hz.

 

[shields 10+ year member]

Would two six be to much port is my other question?

Two six is 56 sq in

Three four is 37.68

Guess by my math the six are close to the top of the rec values and four are just on small side?

 

[shields 10+ year member]

Also how do I figure displacement of an aero port?