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  4. M20 intake manifold design thread

M20 intake manifold design thread

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  • JeffJ
    JeffJ
    Jeff
    wrote on last edited by
    #15

    Why front mounted vs side mount?

    1976 530i e12
    1990 325ix e30
    1992 325i e36
    1995 740il e38
    2001 330xi e46
    ^More to come :)

    1 Reply Last reply
    0
    • R
      R
      Rowleym
      wrote on last edited by
      #16

      Jeff said:

      Why front mounted vs side mount?

      I personally like it for packaging reasons, and long radius(and short in length)  intercooler piping

      96.jpg96.jpg96.jpg96.jpg

      sk8 or die

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      • JeffJ
        JeffJ
        Jeff
        wrote on last edited by
        #17

        I think there needs to be two different ones designed here 1 for the guy that is going n/a and one for the turbocharged monsters

        1976 530i e12
        1990 325ix e30
        1992 325i e36
        1995 740il e38
        2001 330xi e46
        ^More to come :)

        1 Reply Last reply
        0
        • EarlE
          EarlE
          Earl
          wrote on last edited by
          #18

          ^Agreed=) There should be an m42 manifold made too=D

          museum sig 2earl.jpg

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          0
          • B
            B
            B C
            wrote on last edited by
            #19

            Dear Earl,

            2 nights ago I had a dream that I swapped a rebuilt M42 into my car (with my current turbo and such).

            It sucked. true story. 

            sincerely,

            Snapple

            1 Reply Last reply
            2
            • R
              R
              Rowleym
              wrote on last edited by
              #20

              Jeff said:

              I think there needs to be two different ones designed here 1 for the guy that is going n/a and one for the turbocharged monsters

              I would hope so! They are two totally different beasts(not exactly)

              If i wasn't FI I would definitely use ITB's or triple webbers or something

              96.jpg96.jpg96.jpg96.jpg

              sk8 or die

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              • ClassEC
                ClassEC
                ClassE
                wrote on last edited by
                #21

                I'll be supplying the chips and soda for this debacle - so let's start with the hard questions:

                Doritos or Sun Chips?

                1 Reply Last reply
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                • ClassEC
                  ClassEC
                  ClassE
                  wrote on last edited by
                  #22

                  On a more serious note: I'm 100000% in for this.

                  -I like the "front" TB inlet to allow for easy integration of IC cooler piping later (wink-wink).

                  -My previous SRI was built by a gentleman on the east coast who specialized in such things. Acouple design things to consider: vacuum ports and locations. TB flange variations. Integral fuel rail mounts.

                  -I'll have to find the data - but I recall reading a lot of research on having the full bell radius stacks "flush" with the plenum side VS extending "into" the plenum when researching my previous mani. Extending "into" was the winner for all applications.

                  -Gotta look good (design/fitment/welds). I ❤ pretty stuff.

                  My previous SRI off my MK3 ABA:

                  P1000926.jpg

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                  • ClassEC
                    ClassEC
                    ClassE
                    wrote on last edited by
                    #23

                    ^^^That manifold had the full bell radius stacks extending into the plenum. Sounded AMAZING at WOT, nice gains in upper RPMs as well.

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                    0
                    • B
                      B
                      B C
                      wrote on last edited by
                      #24

                      On my manifold Id like the TB flange to be such that it can be easily cut off and a larger one re-welded, or simply re-drilled for a larger TB if I ever find that I am in need of one.

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                      • R
                        R
                        Rowleym
                        wrote on last edited by
                        #25

                        Snap said:

                        On my manifold Id like the TB flange to be such that it can be easily cut off and a larger one re-welded, or simply re-drilled for a larger TB if I ever find that I am in need of one. 

                        the manifold I will be building with definitely have the stock bolt pattern for the TB. Can always redrill for a different one

                        96.jpg96.jpg96.jpg96.jpg

                        sk8 or die

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                        0
                        • frcefedF
                          frcefedF
                          frcefed
                          wrote on last edited by
                          #26

                          Can I pre-order mine?

                          1 Reply Last reply
                          0
                          • R
                            R
                            Rowleym
                            wrote on last edited by
                            #27

                            frcefed said:

                            Can I pre-order mine?

                            Haha Ill make you one but we need to finish the design! I just need to order runners. I just recently ordered 2" .125 wall 6061 t6 for my supercharger intake manifold, but we might need something different for this? not sure.

                            96.jpg96.jpg96.jpg96.jpg

                            sk8 or die

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                            • ClassEC
                              ClassEC
                              ClassE
                              wrote on last edited by
                              #28

                              Here's my 5 minute sketch of how my previous SRI was built as a reference.

                              -Flange w-injector bungs (either original mani chopped or new machined)

                              -Velocity stacks

                              -Flat "plate" with round holes cut to slip stacks through - welded to flange

                              -Round plenum with a portion machined off to match height of plate the stacks are slipped through.

                              D24BC26A-F612-4F97-80A7-58EF46122218.jpg

                              Maybe something like these would work?!? (Google searched - we'd obviously need to to determine overall runner length and such)

                              http://www.velocitystacksonline.com/product/B154-170

                              My concerns are the meet-up of the stacks and original mani (obvious material thickness difference - both for welding and esthetics) and runner length.

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                              • frcefedF
                                frcefedF
                                frcefed
                                wrote on last edited by
                                #29

                                Screenshot2014-07-04-10-51-41.png

                                Dtmfiberwerkz offers this manifold for $900

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                                • JeffJ
                                  JeffJ
                                  Jeff
                                  wrote on last edited by
                                  #30

                                  frcefed said:

                                  Screenshot2014-07-04-10-51-41.png

                                  Dtmfiberwerkz offers this manifold for $900

                                  What is the logic in that manifold why? What does it help? And dimension's on it?

                                  1976 530i e12
                                  1990 325ix e30
                                  1992 325i e36
                                  1995 740il e38
                                  2001 330xi e46
                                  ^More to come :)

                                  1 Reply Last reply
                                  0
                                  • ClassEC
                                    ClassEC
                                    ClassE
                                    wrote on last edited by
                                    #31

                                    frcefed said:

                                    Screenshot2014-07-04-10-51-41.png

                                    Dtmfiberwerkz offers this manifold for $900

                                    If you do some digging in that - they've never actually made one. There's acouple threads I've found on it - company advertises them and shows that as a reference but hasn't actually made one.

                                    1 Reply Last reply
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                                    • I
                                      I
                                      industrialsized
                                      wrote on last edited by
                                      #32

                                      if you need help in the making of any parts let me know i can probably get it handled for you guys i run a fairly large machine shop so if you want something like a bunch of flanges waterjeted out i can get it done for you

                                      also i'm with earl on the m4x manifolds but i guess i can just steal whatever you come up with and cut cyl 1 and 6 of to make an intake for myself

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                                      • frcefedF
                                        frcefedF
                                        frcefed
                                        wrote on last edited by
                                        #33

                                        ClassE said:

                                        If you do some digging in that - they've never actually made one. There's acouple threads I've found on it - company advertises them and shows that as a reference but hasn't actually made one.

                                        So what would happen if I ordered one of these manifolds? Would they just be like "oh, we were kidding" haha.. not that I would order it, especially if the picture represents the actual product, seeing as it wouldn't fit an m20 and if it did, the throttle body would hit the hood.

                                        1 Reply Last reply
                                        0
                                        • ClassEC
                                          ClassEC
                                          ClassE
                                          wrote on last edited by
                                          #34

                                          frcefed said:

                                          So what would happen if I ordered one of these manifolds? Would they just be like "oh, we were kidding" haha.. not that I would order it, especially if the picture represents the actual product, seeing as it wouldn't fit an m20 and if it did, the throttle body would hit the hood.

                                          I would assume they'd do what most companies do - send an email saying the product is not available.

                                          I wouldn't want to order one without seeing the final product anyways.

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