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Precision port question - need 90 degree bend

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  • Precision port question - need 90 degree bend

    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.
    Attached Files

  • #2
    Originally posted by CZ Eddie View Post
    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.
    Francis

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    • #3
      In description they say 17 inch, so if the total port is 19 inch? Then they probably mean 17 inch as the usable length...

      Comment


      • #4
        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.
        Francis

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        • #5
          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.

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          • #6
            Kind of a sharp bend though, don't you think?

            Comment


            • #7
              ^ 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

              Comment


              • #8
                Originally posted by Dukk View Post
                ^ 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.
                Francis

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                • #9
                  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

                  Comment


                  • #10
                    Originally posted by Dukk View Post
                    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?
                    Francis

                    Comment


                    • #11
                      CZ - it won't hardly matter.

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                      • #12
                        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

                        Click image for larger version  Name:	IMG_20200629_102829.jpg Views:	0 Size:	366.8 KB ID:	1445184 Click image for larger version  Name:	IMG_20200629_102911.jpg Views:	0 Size:	393.5 KB ID:	1445185 Click image for larger version  Name:	IMG_20200629_105453.jpg Views:	0 Size:	434.1 KB ID:	1445186 Click image for larger version  Name:	IMG_20200630_090153.jpg Views:	0 Size:	549.4 KB ID:	1445187 Click image for larger version  Name:	IMG_20200629_102856.jpg Views:	0 Size:	549.7 KB ID:	1445188

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                        • #13
                          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.
                          Click image for larger version  Name:	IMG_20200630_090221.jpg Views:	0 Size:	468.0 KB ID:	1445190 Click image for larger version  Name:	IMG_20200630_090251.jpg Views:	0 Size:	590.3 KB ID:	1445191 Click image for larger version  Name:	IMG_20200630_090210.jpg Views:	0 Size:	517.2 KB ID:	1445192

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                          • #14
                            Sewer pipe technology to the rescue! Looking good...
                            Francis

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                            • #15
                              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.
                              My Builds - Vigor (Nola Brio Knockoff) - Overnight Sensations w/ Voxel - Speedsters in surplus boxes - Zaph B3N's in bamboo - Classix II in BR-1 cabinets - Dual TPA3116 D2 amp in an old music box - Mariposas

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