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H23A upper plenum vs F22A3 (F22A6)

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    #1

    H23A upper plenum vs F22A3 (F22A6)

    I've almost done with the 30+ thread except for this plenum. It was very hard to find those parts in Finland and the H23 is even more difficult. So i'm just wondering if it's something that I should go for. I know there's gain on H23 vs A1 cause the A6 gave a noticeable gain. But what about H23 vs A6? I know people are putting H23 on their cars so it's probably the best choice. But when it's not so easy to get the parts then I'm interested on how much it really gains. Is it even noticeable? And i'm sticking with the A6 runners cause there's alot of debate which is better, so guess it's not SO huge difference.

    Side question: If I decide to go with the H23 then does my current SRI fit on it because of the larger TB? And yeah, it's one of those from ebay.
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    #2
    The main difference between the h23 and the a6 is the throttle body inlet size. I have only done the a1 to a6 (one of the first ones to actually document the differences). But i can't say if the h23 will be more of a benifit.

    Since its hard to find now then you. And you always can change it later if you do find it.

    Get the a6 camshaft and have fun.

    H23 is common here. I wonder how much it would be to ship it to you.

    As for your intake fitting I think you will be OK because I don't hear anything about people having to swap intakes
    Last edited by accordztech; 03-19-2011, 05:35 AM.
    What makes me laugh about forums, is that no matter how much you try to help someone, they dont take the advice. Go ahead and do it the hard way.

    You got to respect what you drive, and appreciate what you have, making the best of what you got. and if that means putting CAI, HID's, a phat stereo system, and a idiot in the drivers seat...then so be it!

    Retro!

    Hater

    I love nooBs...They make me look good

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      #3
      Do you have f22b dohc's there? Or what about an f20a dohc? h22a/f20b?

      They all have the same plenum and throttle body as an h23

      Comment

        #4
        Originally posted by Tippey764 View Post
        Do you have f22b dohc's there? Or what about an f20a dohc? h22a/f20b?

        They all have the same plenum and throttle body as an h23
        Mostly we've got 2,0i preludes here and we do have those engines BUT they are rare. And usually they are not sold for parts cause people take so good care of them. The most common search place on the interenet where people look spareparts can't find ANY of the intake manifold nor plenum to prelude -92-98. And on the other site there's only 1 who's got the plenum I want but he is only selling the whole engine. Maybe that tells you something about the situation in Finland.

        I was discussing about the shipping with another CB-member and it wasn't that much that I couldn't take it. But the reason that I haven't took it already is basicly the gain. If it's not so much compared to what i've got then i'm going to pass it.

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          #5
          Ah, i went from an a6 to an h23 plenum

          the difference was night and day but i also cleaned out all the EGR and the runners

          Comment

            #6
            Does the F22A3 have an intake manifold with a removable plenum? If so, then it's likely identical to the F22A6 manifold (I think we've discussed that before.) Rather than getting the entire manifold, you can use just the plenum and throttle body of either the H23 OR the H22. That would give you more options. Buying the plenum and throttle body only would also save shipping costs.

            The larger plenum and throttle body definitely make a difference. The F22A6 manifold (or any other F22A 2-stage design) is an upgrade over the F22A1 single-stage.






            Comment

              #7
              H23 plenum/TB are worth the upgrade, it will transform your top end


              Originally posted by lordoja
              im with you on that one bro! aint nothing beat free food and drinks any day of the week, even if its at a funeral

              Comment

                #8
                its worth doing the plenum/TB swap. The stock F22Ax TB size is 58mm and the H22/23 is 62mm so 4mm will net you some power throughout the rev range

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                Comment

                  #9
                  It's got removable plenum. And I'm also quite sure that it's identical with F22A6 intake manifold. I'm going to keep the runners but the upper plenum+TB was the main problem. Cause I don't want to buy something from over seas when it really doesn't matter which TB and upper plenum i've got. But this thread has convinced me that it is worth doing. I also hope that I feel the same after the change. Is there something that I should take notice before buying the H23/H22 upper plenum+TB? Ofcourse I need those FITV+friends on it, they don't probably work from F22A6?

                  Comment

                    #10
                    Actually all the valves attached to the intake manifold are the same between the a6 and h23 manifold you just need to reroute the coolant hoses

                    chances are you will need new fuel injector seals too

                    I did when i did my swap

                    Comment

                      #11
                      If he just does the plenum, he could get away with not removing the injectors at all.






                      Comment

                        #12
                        Originally posted by Tippey764 View Post
                        Actually all the valves attached to the intake manifold are the same between the a6 and h23 manifold you just need to reroute the coolant hoses

                        chances are you will need new fuel injector seals too

                        I did when i did my swap
                        Well i replaced those when I swaped the F22A3 intake on me. But what about the FITV, is it also the same cause the part# doesn't match on Accord? Everything else does. Do I need new coolant hoses or will those old ones be long enough? Yeah, the idea is just to swap the upper plenum.

                        I gotta ask now, when you are talking about intake plenum which part is it exactly? The whole assembly from upper plenum to the runners, right? Cause sometimes I see that people are talking about runners and lower plenum, thats the same part? Sorry, but i'm still working with my car vocabulary in english.

                        Thanks for the tip!
                        Last edited by MrSpeedy; 03-20-2011, 08:56 AM.

                        Comment

                          #13
                          Originally posted by MrSpeedy View Post
                          It's got removable plenum. And I'm also quite sure that it's identical with F22A6 intake manifold. I'm going to keep the runners but the upper plenum+TB was the main problem. Cause I don't want to buy something from over seas when it really doesn't matter which TB and upper plenum i've got. But this thread has convinced me that it is worth doing. I also hope that I feel the same after the change. Is there something that I should take notice before buying the H23/H22 upper plenum+TB? Ofcourse I need those FITV+friends on it, they don't probably work from F22A6?
                          Yea if you can it would prob be best just to get a complete OBD1 H23 (or H22) intake manifold/TB, and then swap over the top half w/all the components. The only thing the F22A6 & H22/H23 plenum/TB share is the bolt pattern to the lower runners.

                          And the H22/H23 plenum also has significantly more volume which I think is the main driver of the better top end (and overall throttle response)


                          Originally posted by lordoja
                          im with you on that one bro! aint nothing beat free food and drinks any day of the week, even if its at a funeral

                          Comment

                            #14
                            Originally posted by gloryaccordy View Post
                            Yea if you can it would prob be best just to get a complete OBD1 H23 (or H22) intake manifold/TB, and then swap over the top half w/all the components. The only thing the F22A6 & H22/H23 plenum/TB share is the bolt pattern to the lower runners.

                            And the H22/H23 plenum also has significantly more volume which I think is the main driver of the better top end (and overall throttle response)
                            and yet no one has mentioned the second IAB plate...

                            93 cb7 ex coupe
                            Granada Black Metallic

                            Comment

                              #15
                              Originally posted by Turbocutlass View Post
                              and yet no one has mentioned the second IAB plate...
                              I've read that it could bring some 3-5 more hp but it hasn't been proved or anything. So that's why I have just asked about the manifold gain. Though I am thinking also putting the second IAB on it. Btw does it matter which way you put the second plate? I mean does it go under or over the butterflyvalves?

                              Comment

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