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H23 IM mod.

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    #1

    H23 IM mod.

    okay guys im thinkin about doin this to my h23 intake mani that im getting ready to put on my F22, i would do it to the plenum the spacer and the runners would their be some gains? and has anyone else done this?? let me know, heres what i mean.

    from this...



    to this....



    http://www.cb7tuner.com/vbb/showthread.php?t=91030 <--MY RIDE!
    http://www.cb7tuner.com/vbb/showthread.php?t=140230 <--MY ongoing ENGINE BUILD!..
    Tags: None
    #2
    It would probably hurt you a little. The idea is to create as smooth an airflow as possible, that's going to create turbulence. There's a reason they make them like that. If the oval worked better, they'd make them with the oval.

    Comment

      #3
      yeah i was kinda thinkin the same thing. i think i will just port them out a little. i still need to get another spacer, after that then its going on! probley this weekend coming up

      http://www.cb7tuner.com/vbb/showthread.php?t=91030 <--MY RIDE!
      http://www.cb7tuner.com/vbb/showthread.php?t=140230 <--MY ongoing ENGINE BUILD!..

      Comment

        #4
        They made them that way so it matches butterfly on a6 and h23, I belive "D112crzy" done it and it work flawless, let see what he has to say
        Last edited by keycb7; 01-25-2009, 06:43 PM.

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          #5
          anyone else have an opinion?

          http://www.cb7tuner.com/vbb/showthread.php?t=91030 <--MY RIDE!
          http://www.cb7tuner.com/vbb/showthread.php?t=140230 <--MY ongoing ENGINE BUILD!..

          Comment

            #6
            lodollar92lx did his bigger than that....thaer is nothing in the center of his...
            OHIO CB7's

            My Ride

            MOD FUND: better if I could sell some of my stuff.

            Build Thread

            vouches: oneoffaccord, dep22build, 1993haccord, hostile, da9b16, brian91accord,93 Accord lx, kc8enb

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              #7
              I've done it to my H22.. Double stacked like that, and the runners two.. Sounded NICE, and loved the top end...
              Last edited by gfrg88; 01-26-2009, 12:01 PM.
              -Gio

              1990 Honda Accord LX-T (sold).

              1992 Honda Accord Wagon.

              1986 E-85 Turbo Prelude.

              Comment

                #8
                Originally posted by keycb7 View Post
                They made them that way so it matches butterfly on a6 and h23, I belive "D112crzy" done it and it work flawless, let see what he has to say
                I did it to the actual runners since I'm not running a spacer/iab plate.

                IMO, the modified version above would work MUCH better than the original due to you're actually making the 4 individual runners longer(that's if you put the spacer on the bottom of the IAB(of you could just use the spacer with no iab plate).

                Longer runners make for more torque, earlier. Think of it as a quicker "spool up"

                CrzyTuning now offering port services

                Comment

                  #9
                  Originally posted by d112crzy View Post
                  I did it to the actual runners since I'm not running a spacer/iab plate.

                  IMO, the modified version above would work MUCH better than the original due to you're actually making the 4 individual runners longer(that's if you put the spacer on the bottom of the IAB(of you could just use the spacer with no iab plate).

                  Longer runners make for more torque, earlier. Think of it as a quicker "spool up"
                  You don't think that the turbulence caused by this would be worse than the smoother airflow of the original 8 hole design? I can understand if it was just taking off a little around the edges to port match, but it seems that if the best HP boost came from this shared opening design, they would make them this way.

                  Comment

                    #10
                    THey made them just because they can. I doubt they seriously put some R&D behind it.

                    The 8 holes are the ones that orignally cause turbulence.

                    How many runners do you have going to your head? Why not make THOSE runners longer, instead of making extending the 8 SMALL, RESTRICTIVE holes longer?

                    Doesn't require much thought really.

                    An even better idea would be to smooth the 3 center dividers to a point, as to cut the air.

                    CrzyTuning now offering port services

                    Comment

                      #11
                      Originally posted by d112crzy View Post
                      THey made them just because they can. I doubt they seriously put some R&D behind it.

                      The 8 holes are the ones that orignally cause turbulence.

                      How many runners do you have going to your head? Why not make THOSE runners longer, instead of making extending the 8 SMALL, RESTRICTIVE holes longer?

                      Doesn't require much thought really.

                      An even better idea would be to smooth the 3 center dividers to a point, as to cut the air.
                      Here's my train of thought: You're going to put the spacer on top of this, which has 8 holes, merging into the four runners that go into the head:


                      (image borrowed)

                      By cutting out the material between the primaries and secondaries in the spacer, you're creating a larger cavity for the air to flow into, creating a disruption in the direction of flow and exposing this ^ flat blunt surface to the flow of air, causing impact turbulence in the plenum/runner transition point. If you don't modify the spacer plate this way, you could port match everything for the smoothest flow possible, but creating these 4 oval shaped openings between the 8 holes on the bottom of the plenum and the 8 holes on the top of the runners seems less helpful than leaving them alone. (I know a little something about airflow, you have to when you do HVAC. Not being snotty, just defending my position! )

                      Originally posted by d112crzy View Post
                      Doesn't require much thought really.
                      Maybe not, but I did already have some thought put into it.
                      Last edited by visualpoet; 01-26-2009, 02:52 PM.

                      Comment

                        #12
                        Well you are missing the part where they did the same mods to the runners, the spacer, and the plenum. Also what the OP was saying to do. So it'll all match. It's kinda like making a budget Euro-R intake.
                        1992 Oldsmobile Custom Cruiser

                        1986 Chevrolet C10|5.3L|SM465|Shortbed|Custom Deluxe

                        1983 Malibu Wagon|TPI 305|T5 5 speed|3.73 non-posi


                        1992 Accord Wagon (RETIRED)

                        Comment

                          #13
                          Originally posted by Accrdwgnguy View Post
                          Well you are missing the part where they did the same mods to the runners, the spacer, and the plenum. Also what the OP was saying to do. So it'll all match. It's kinda like making a budget Euro-R intake.
                          My bad, I did miss the runner comment in the OP. Thanks for the correction, carry on.

                          Why not open it up all the way then? Is there serious concern for structural rigidity without the three inner walls?

                          Comment

                            #14
                            HA. I totally forgot the stock runners has 8 holes, instead of 4 like mine does.

                            You're right, visualpoet.

                            CrzyTuning now offering port services

                            Comment

                              #15
                              Originally posted by d112crzy View Post
                              HA. I totally forgot the stock runners has 8 holes, instead of 4 like mine does.

                              You're right, visualpoet.
                              I had to go to the garage to look at mine to make sure I wasn't talking out of my ass before I looked for that pic.
                              Then I felt stupid for missing the fact that the OP seems to be talking about doing that all the way through everything.

                              What IM are you running with only 4 ports on the top?

                              Comment

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