Precision port question - need 90 degree bend

[CZ Eddie]

Why in the world does Precision Port not offer a 90* bend via OEM?
Anyhow, I need a port that is longer than front-to-back enclosure space available.
And I don't want a side-port.

So I will take my 4" precision port and mate it to a regular 4" PVC so I can use a PVC elbow to get a 90* bend and more length.

But can anyone help me figure out how long the 3" flared end equates to as a non-flared port?
Like, does the 3" flare = 2" length of regular straight port?

Need this info to figure out total port length required.

[fpitas]

Why in the world does Precision Port not offer a 90* bend via OEM?
Anyhow, I need a port that is longer than front-to-back enclosure space available.
And I don't want a side-port.

So I will take my 4" precision port and mate it to a regular 4" PVC so I can use a PVC elbow to get a 90* bend and more length.

But can anyone help me figure out how long the 3" flared end equates to as a non-flared port?
Like, does the 3" flare = 2" length of regular straight port?

Need this info to figure out total port length required.

The rule of thumb is to count half the flare depth.

[Scarface1]

In description they say 17 inch, so if the total port is 19 inch? Then they probably mean 17 inch as the usable length...

[fpitas]

I usually cut ports a little long to start with, then trim to get the tuning I was aiming for. Once the length is right, I glue the port sections and flares together.

[Chris Roemer]

You can glue up a nice 90* bend (if you have to) by miter-cutting out a very short length (1/2"?) at>22.5*> \_/ <22.5*, then rotating the center section around 180* and gluing (epoxy) back together. It makes a nice short bend with two 45s in it.

[CZ Eddie]

Kind of a sharp bend though, don't you think?

[Dukk]

^ Nice thing with 4" is you can get inside and sand the sharp inside edge out. I generally just go to standard pipe and use standard pipe ells if I have the room available.

It is a pretty major miss that they do not offer pre-made 90s

[fpitas]

^ Nice thing with 4" is you can get inside and sand the sharp inside edge out. I generally just go to standard pipe and use standard pipe ells if I have the room available.

It is a pretty major miss that they do not offer pre-made 90s

It is a bizarre oversight. 45s might be handy as well.

[Dukk]

I thought I had seen something like this before..... and I had!
https://www.parts-express.com/dayton...elbow--268-334

No longer available. WHY??


Found some Jantzen ones on Hifi Collective but at 43.58pounds plus freight for a complete kit they are kind of spendy

[fpitas]

I thought I had seen something like this before..... and I had!
https://www.parts-express.com/dayton...elbow--268-334

No longer available. WHY??


Found some Jantzen ones on Hifi Collective but at 43.58pounds plus freight for a complete kit they are kind of spendy

That's kind of a sharp elbow, anyways. Would it kill them to imitate sewer pipe plumbing elbows?

[Chris Roemer]

CZ - it won't hardly matter.

[CZ Eddie]

I ended up just plugging a 90 degree PVC onto the flare and it worked out great.
The PVC is about 1/8th inch too big around, but putting a nice flat blob of PL Premium glue around the flare and stuck it into the PVC and let it dry overnight.
PL Premium is great, thick all-around construction glue.
I would not try this with milky flowing wood glue.

It worked out perfect.
The PVC I used is 7.5" length as measured.
Plus a 2" larger diameter connection fitting at the end.

You can get this exact PVC from here as Model # C4807HD2:
https://www.homedepot.com/p/NIBCO-2-...7HD2/100343360

Or here as Model # C4807:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

[CZ Eddie]

Finished product after glue & paint dried and is mounted.
The tan specs/debris in the pic below are just dust that I failed to wipe off before snapping pictures.

[fpitas]

Sewer pipe technology to the rescue! Looking good...

[silverD]

Just saw this thread, but the info might be a little late. Here are the calculations for flared port length for the precision ports: http://www.psp-inc.com/tools2.html
As for PVC elbows, try to find the long turn versions if you have space to allow for them.