Aero/square port question.

[CHEMMINS 10+ year member]

Is there sonically or a meterable difference between internal or external ports given that the enclosure is optimal volume.

If so.......why?

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[SpeedEuphoria 10+ year member]

A correct flared port is more efficient due to Bernoulli's Principle

Meaning that you can use smaller ports and get similar results

Meterable difference is prob only when space is a concern and a bellmouth'd port can be smaller and get results of a bigger port

If you can make a proper square port large enough then I'm not sure it will make a diff

 

[Buck 5,000+ posts]

Not that big of a difference if any at all. It's more of a space thing.

 

[CHEMMINS 10+ year member]

Has anyone tried them back to back to see if the internal/external ports can be noticed? Obviously the bellmouthed ports will have less chance of whistle but will the flare change anything on an external compared to the internal port.

 

[SpeedEuphoria 10+ year member]

the only thing I can tell you from looking into velocity stacks/bellmouths for use in internal combustion engines is that I believe the bell mouth works better if its raised off the surface. It scavenges air better IIRC

So it would work better if not mounted to the box on either side(neither flare touching the box wall), so the flare is extended into or out of the box at least 1" or a couple inches on both sides.

As far as internal or external shouldn't matter, as long as following the above. Just more available internal box volume with an external port

 

[Buck 5,000+ posts]

And honestly I think if there were any differences, they would be very minimal...

 

[slim2fattycake 10+ year member]

No internal anomalies. There isn't a tube and the back end of the flare obstructing airflow inside the box.

PS- Funny Bernoulli's equation comes up because I just finished learning about it in class last week.