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Off make Multi port injector bungs?

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  • Off make Multi port injector bungs?

    Hello
    I know from my weak google search skills, that they make injector bungs that you are to weld into The manifold.
    I also saw that the more popular engines they have pre made intakes with them.
    But what do you do if welding isn't an option and your power plant isn't the lucky few that you can just buy one and bolt it on?
    Can you buy the bungs and just press them into the intake like you would press in a cylinder liner into a block, then epoxy the top to seal the o/d of the bung to the intake?
    Do you just forget pressing them in, and just drill and epoxy them in? instead, and if so what type epoxy that not crack in the heat cycles of the intake and bungs, or does the intake even get hot enough for that to even be a worry/issue? v block not an inline type with the exhaust right under the intake.


  • #2
    You need to talk to BBR (BigBlockRanger) - he J B welded his bungs in on one of his EFI projects.

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    • #3
      I am making an intake now. If welding is not an option for you, I would consider a tuned port like setup where there are fuel rails that are bolted to the intake. If you are worried about flow, feed both sides for the fuel rail. That way I think you can just drill and counterbore the runners and not have to worry about attaching bungs.

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      • #4
        Start here to see what I did and some of the options I considered:

        https://bangshift.com/forum/forum/ba...s-alive/page93

        In a nutshell, I drilled the intake for the bungs, then drilled & tapped the intake and bungs for set screws, slathered the bungs in JB Weld (mainly to seal them), inserted them in the manifold then put the set screws in to lock them in place.
        Life is short. Be a do'er and not a shoulda done'er.
        1998 Mustang GT https://bangshift.com/forum/forum/ba...ix-to-4sixzero
        1983 Mustang GT 545/552/302/Turbo302 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
        1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
        1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail

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        • #5
          Originally posted by BBR View Post
          Start here to see what I did and some of the options I considered:

          https://bangshift.com/forum/forum/ba...s-alive/page93

          In a nutshell, I drilled the intake for the bungs, then drilled & tapped the intake and bungs for set screws, slathered the bungs in JB Weld (mainly to seal them), inserted them in the manifold then put the set screws in to lock them in place.
          I started reading your thread. only a few pages in from where that link dropped me.
          Did your bungs have a tight fit, or kinda just drop in, epoxy, then match to the port roof,
          I like the pipe thread adapter idea another member posted. But I always thought the injectors bungs had a stepped hole so the injector could only go in so far. have to google to see if I find a photo of the bottom of an injector drilled hole.
          I picked up a holley branded pro jection 4, tbi unit, thinking I can use that as the throttle body and TPS . It is claimed to flow 900 cfm, Just have to figure out if I should remove the 4 injector pod that sits above the throttle body itself.
          Last edited by Eric; March 11, 2020, 08:05 AM.

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          • #6
            They were not a tight fit hence the use of the set screws to mechanically lock them in place.

            Most aftermarket bungs you buy are straight through with no internal step.
            Life is short. Be a do'er and not a shoulda done'er.
            1998 Mustang GT https://bangshift.com/forum/forum/ba...ix-to-4sixzero
            1983 Mustang GT 545/552/302/Turbo302 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
            1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
            1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail

            Comment


            • #7
              Originally posted by BBR View Post
              They were not a tight fit hence the use of the set screws to mechanically lock them in place.

              Most aftermarket bungs you buy are straight through with no internal step.
              Hello, when you placed the bungs, do you aim them so the injector was firing down at the port floor, Or as angled as you could get toward the backside of the intake valve?

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              • #8
                Originally posted by Eric View Post

                Hello, when you placed the bungs, do you aim them so the injector was firing down at the port floor, Or as angled as you could get toward the backside of the intake valve?
                the goal in racing engines is to point the injector at the intake valve.

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                • #9
                  Originally posted by Eric View Post

                  Hello, when you placed the bungs, do you aim them so the injector was firing down at the port floor, Or as angled as you could get toward the backside of the intake valve?
                  Ideally at the back of the intake valve, but I have been told that it is not a necessity. I just put them in where it is possible and don't worry about it.
                  Life is short. Be a do'er and not a shoulda done'er.
                  1998 Mustang GT https://bangshift.com/forum/forum/ba...ix-to-4sixzero
                  1983 Mustang GT 545/552/302/Turbo302 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
                  1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
                  1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail

                  Comment


                  • #10
                    Originally posted by BBR View Post

                    Ideally at the back of the intake valve, but I have been told that it is not a necessity. I just put them in where it is possible and don't worry about it.
                    Yes - a lot of OEMs weren't able to pull off this sort of targeting either. If you can't target the intake valve, "Just point them downstream and hope for the best" is a valid option. I've even seen cases where the injectors were installed perpendicular to the airflow - obviously not ideal, but it worked.

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