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Projects Modifying SBC 1x2 manifold into 3x2

Discussion in 'The Hokey Ass Message Board' started by 39 Aaron NZ, Feb 11, 2018.

  1. studebakerjoe
    Joined: Jul 7, 2015
    Posts: 449

    studebakerjoe
    Member

    Its one of the throttle body intakes like you'd find on a pickup. Im in NY if you'd like it I'll check on shipping cost. As I said the manifold would be no cost.
     
  2. 39 Aaron NZ
    Joined: Jan 2, 2017
    Posts: 80

    39 Aaron NZ
    Member

    Hi Joe, I just saw your photo. That won't fit, but thanks for the offer and the ideas.
    Cheers Aaron.

    Sent from my SM-G360G using The H.A.M.B. mobile app
     
  3. studebakerjoe
    Joined: Jul 7, 2015
    Posts: 449

    studebakerjoe
    Member

    Aaron the one in the photo isnt the one I'm talking about I showed that one if you had vortec heads. The one I mentioned is the older tbi style that fits old style heads.
     
  4. studebakerjoe
    Joined: Jul 7, 2015
    Posts: 449

    studebakerjoe
    Member

  5. brigrat
    Joined: Nov 9, 2007
    Posts: 4,808

    brigrat
    ALLIANCE MEMBER
    from Wa.St.

    1982 Corvette Aluminum Cross Fire, unbolt top, make another!
    s-l640.jpg
     
    Deuces, VANDENPLAS, saltflats and 3 others like this.
  6. 39 Aaron NZ
    Joined: Jan 2, 2017
    Posts: 80

    39 Aaron NZ
    Member

    Thank you Joe, but I don't think access to the lower plane is as good, even tho it's Alui, I will keep playing with my manifold.
    Again Thank you for the offer.
    I have a wedding to go to this weekend so I'll start on my manifold next weekend.
    I'll keep you all up to date on 'attempted progress'
    Cheers Aaron.

    Sent from my SM-G360G using The H.A.M.B. mobile app
     
  7. '51 Norm
    Joined: Dec 6, 2010
    Posts: 663

    '51 Norm
    Member
    from colorado

    Cross fire intakes are hard to find in the U. S. I'm betting that finding one in New Zealand would be next to impossible.
     
  8. brigrat
    Joined: Nov 9, 2007
    Posts: 4,808

    brigrat
    ALLIANCE MEMBER
    from Wa.St.

    There's several on E-Bay rite now, all for under 2 bills, most with free shipping. To NZ? probably not!
    Looks like his mind is made up so it' a mute point I guess....................................
     
    XXL__ likes this.
  9. 39 Aaron NZ
    Joined: Jan 2, 2017
    Posts: 80

    39 Aaron NZ
    Member

    I don't think $200 + shipping for a Cross Fire is a good investment - another $125 for this
    [​IMG]
    an it's no work involved, however that brings it to over $500 NZ dollars, which I was trying to avoid in the first place.
    Which brings me full circle back to my original plan...

    Sent from my SM-G360G using The H.A.M.B. mobile app
     
    clem likes this.
  10. Gman0046
    Joined: Jul 24, 2005
    Posts: 5,639

    Gman0046
    Member

    Way too much money to spend just for aesthetics adding 3x2's. A single 4 barrel will out perform 3x2's all day long for a Hell of a lot less.
     
    Last edited: Feb 14, 2018
    RaginPin3Appl3 likes this.
  11. And so will late model fuel injection but that's not really the point is it?
     
  12. 39 Aaron NZ
    Joined: Jan 2, 2017
    Posts: 80

    39 Aaron NZ
    Member

    Well put!
    We are getting way away from 'has any one tryed this?'
    If I can keep it duel plane like my second drawing, and it runs well, I will be really happy, and proud of it being home built.
    Thanks Aaron.

    Sent from my SM-G360G using The H.A.M.B. mobile app
     
  13. brigrat
    Joined: Nov 9, 2007
    Posts: 4,808

    brigrat
    ALLIANCE MEMBER
    from Wa.St.

    My last suggestion (and you have probably already planned this) before any welding I would bolt the desired manifold to a SBC block and heads. Could be junk, empty & bare, just to keep the warpage at a minimum when welding.........................................................
     
    Last edited: Feb 15, 2018
    Nailhead Jason, 270ci and 39 Aaron NZ like this.
  14. 39 Aaron NZ
    Joined: Jan 2, 2017
    Posts: 80

    39 Aaron NZ
    Member

    Thanks Brigrat. That's a good plan, I have a spare SBC in my bar leaner that I can pull out and bolt it to.
    [​IMG]
    Thanks again, Aaron.

    Sent from my SM-G360G using The H.A.M.B. mobile app
     
  15. Smiffy
    Joined: Dec 30, 2014
    Posts: 100

    Smiffy

    If you really want to try something different - why don't you make a log manifold and run a few more carbs. You'll spend just as much time fabricating it as you would mucking around trying to reinvent your old two barrel manifold. Have only three carbs working on it rest for show that's what a lot of guys use to do.
     
    kidcampbell71 and 39 Aaron NZ like this.
  16. 39 Aaron NZ
    Joined: Jan 2, 2017
    Posts: 80

    39 Aaron NZ
    Member

    I spend a lot of time going through 'THE INDUCTION THREAD' of Mad Mikey and really keen on a 3x2, and like the idea of fabricating one.
    There has been good points that I will put into practice from this thread. The rest will be try n see.
    With 2 results possable...
    1 - I have a kick ass looking manifold that I built, working well on my car.
    2 - I have a kick ass looking manifold that I built on my bar leaner
    Either way, time well spent

    Sent from my SM-G360G using The H.A.M.B. mobile app
     
    tb33anda3rd and iwanaflattie like this.
  17. I have kicked my self in the Ass for selling that Crietz to you Lon!! So glad it turned out as cool as it did! still looking for another one....
     
    kidcampbell71 likes this.
  18. fatkoop
    Joined: Nov 17, 2009
    Posts: 711

    fatkoop
    Member

    I know this may sound nuts to many here, but sometimes I just enjoy the challenge of building stuff myself. Even if I can buy something that will work, I usually opt for making my own. Takes more time than money, but I always learn from the experience.
     
    bct, 39 Aaron NZ, Morrisman and 2 others like this.
  19. Boneyard51
    Joined: Dec 10, 2017
    Posts: 2,866

    Boneyard51
    Member

    Do you have the carbs? I ve got a line on some cheap ones, but they are front inlets. Bones
     
  20. A customer of mine used this set up on his Windsor engine. One of my 4x2 intakes and an adaptor plate was made for it. Or one of my 3x2 carby intakes could also be used 28061635_10215731970557363_2259740713922231749_o.jpg 28061660_10215731970317357_5205599279808482435_o.jpg 28161723_10215731970357358_4510602629431823813_o.jpg P1080147.JPG
     
  21. 39 Aaron NZ
    Joined: Jan 2, 2017
    Posts: 80

    39 Aaron NZ
    Member

    Hi Bones, thanks but I'll buy 2 side fuel inlets. Easer to plumb and smaller base plate.
    Cheers Aaron.
     
    loudbang likes this.
  22. 39 Aaron NZ
    Joined: Jan 2, 2017
    Posts: 80

    39 Aaron NZ
    Member

    Wow Elco Heads, you make good looking adaptors!
    And cool to see stuff like that is local-ish.
    Not what I am after tho thanks.
    Cheers Aaron.
     
    Johnny Gee and loudbang like this.
  23. XXL__
    Joined: Dec 28, 2009
    Posts: 1,742

    XXL__
    Member

    I'm pretty sure there is at least a 3rd possibility. Good luck with this endeavor.
     
  24. I've been following this since you started it. Sometimes a shared idea isn't received well. Then there will be all the experts that will say it won't work or do it this way of that way. I say go for it because I hear that you understand how a dual plane flow's. The only person that is allowed to disappoint you is you. Now go have fun with your project.

    "The odds were a hundred to one against me
    The world thought the heights were too high to climb
    But people from Missouri never incensed me
    Oh, I wasn't a bit concerned
    For from hist'ry I had learned
    How many, many times the worm had turned

    They all laughed at Christopher Columbus
    When he said the world was round
    They all laughed when Edison recorded sound
    They all laughed at Wilbur and his brother
    When they said that man could fly

    They told Marconi
    Wireless was a phony
    It's the same old cry
    They laughed at me wanting you
    Said I was reaching for the moon
    But oh, you came through
    Now they'll have to change their tune

    They all said we never could be happy
    They laughed at us and how!
    But ho, ho, ho!
    Who's got the last laugh now?" Ira Gershwin
     
    Last edited: Feb 21, 2018
    pbr40, slim38 and 39 Aaron NZ like this.
  25. I like what you are trying to achieve with this and really hope you can pull it off. I can see some balance issue with some cylinders running richer like the Falcon and Mustang six single bbl log manifolds but heck...they work.
    Stay focused on your plan and do it just because you can. :cool::) JW
     
    39 Aaron NZ likes this.
  26. 39 Aaron NZ
    Joined: Jan 2, 2017
    Posts: 80

    39 Aaron NZ
    Member

    So... Maybe no one has tried this be for, due to where the thermostat housing is there is no room for the front carb.
    20180306_203914.jpg
    Also I've been researching this alot, factory 3x2 have the thermostat way forward due to the placement of the front carb and the carb centers being wider than the inlet ports in the head. The flow on the 3x2 have been called a 'train crash'
    Screenshot_2018-03-08-21-10-15.png
    And with comments of 'why don't you just buy one?'
    Got me thinking... as I'm this committed (stubborn) I will fabricate something custom,
    As I'm not running a hood, I plan on lifting the outer carbs up above the center carb so I can bring them in closer and will blend in with the center carb flow, staying with this placement
    Screenshot_2018-02-27-15-33-10.png
    But with a 6" spacer and as it will be a progressive linkage on the outer carbs there will be adequate air flow acting like a tunnel ram at higher RPM. 20180307_224423.jpg
    The outer carbs will be bolted above the center carb. The front carb runners will have a slight dog leg, the rear carb runners will be straight down.
    Combining SBC factory with this idea
    Screenshot_2018-03-07-14-09-13.png
    The benefits of the factory duel plane for low RPM response AND tunnel ram performance at higher RPM .

    Thanks to all watching, I'll keep you posted on progress.
    Cheers Aaron.
     
    26 T Ford RPU likes this.
  27. X-cpe
    Joined: Mar 9, 2018
    Posts: 707

    X-cpe

    A couple of suggestions. In the picture with the staggered holes, the lower planes are wrong. the lower plane for the front carb is the port for the #1 cyl. & the lower plane for the rear carb is the port for the #6 cyl. If I was going to do this as cheaply as possible here's what I would try. My adapters would be made of tubes with a plate welded on top for the carb base. The height of the adapter would be what ever it took to clear the thermostat housing. For the center carb ,a spacer. After you locate the carb spacing clamp the manifold in the drill press and use a hole saw to open up the manifold. On the lower planes you will need a long pilot bit. (My drill press doesn't go slow enough for the larger holes so I just ignore the rules and keep on getting up. An old machinist once told me the primary purpose of cutting fluid was to cool the tool so I use whatever fast evaporating aerosol I have handy-usually Berkobile 2+2 gum cutter. Is there a danger of starting a small fire? Yes, just use enough to keep the heat down and go slow. Even with that kind of abuse my hole saws last along, long time.) Next make a jig out of scrap to go across the center carb with its spacer to hold the end carb bases in place, insert the tubes and weld (or braze) as much as you can. Then remove the jig and finish. On the carb base plates you should chamfer the tops of the holes for the tubes so the weld can sit down in. To finish it gently grind down the tops of the welds close. Finish "machining" can be done by gluing down a course sanding belt to a piece of steel or wood, clamp that on the work bench, invert the manifold and start rubbing until the carb bases (all three) are flat and even. Then its just a matter of finer and finer grits.
     
    39 Aaron NZ likes this.
  28. porknbeaner
    Joined: Sep 12, 2003
    Posts: 41,103

    porknbeaner
    Member

    It used to get done all the time in the '50s and '60s. I have welded on intakes that were converted and the weld cracked after countless years if use/being kicked around but never actually converted one. Looks like you are headed in the right direction.
     
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  29. porknbeaner
    Joined: Sep 12, 2003
    Posts: 41,103

    porknbeaner
    Member

    Big quote. but here's an idea anyway.

    Block the original T stat housing, tap into the crossover with say a pair of 1/2" fittings and run them to a remote T stat housing.
     
    X-cpe, 26 T Ford RPU and 39 Aaron NZ like this.
  30. 57JoeFoMoPar
    Joined: Sep 14, 2004
    Posts: 4,280

    57JoeFoMoPar
    Member

    Reinventing the wheel with some cobbled together intake that could be simply purchased new or used easily over the internet seems like a waste of time and effort. I get it, you're in NZ, but hot rodding is expensive. I vote to run the 2 bbl until you have the scratch to get the right parts for the job. You're running a SBC, I'd give you a pass if you were looking for an exotic intake for a straight 8 Buick or something.
     
    brigrat and D-Russ like this.

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