Fuel injection for the slant six

Slant 6 Engines

  1. hemichuck

    hemichuck Well-Known Member

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    ive got a 63 Dart Wagon that’s a slant six and it’s in real good shape so I was considering maybe putting an aftermarket fuel injection setup on it. Anybody done this? What did you use? And what were the results?
     
  2. 65 Dartman

    65 Dartman FABO Gold Member FABO Gold Member

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    There's a couple of guys over at slant6.org using FitEch FI on an Offy 4 barrel intake. Several others are using MPFI controlled by aftermarket controllers.
     
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    • low_kota

      low_kota Well-Known Member

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      It will be a while before I get it all installed, but I ordered a Holley sniper 2300 and a tanks inc. EFI tank and fuel pump.
       
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      • toolmanmike

        toolmanmike FABO Staff Staff Member FABO Gold Member

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        I think port injection would be best for a straight 6.
         
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        • 64DartGTinAZ

          64DartGTinAZ FABO Gold Member FABO Gold Member

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          I'm still a ways off from getting it installed (the guy at Fox Engineering ran onto some hard times and never sent me the controller that I paid him for as part of the package - stopped even responding with sob stories after 2 years of me ask, "Hey, how's it coming along?" - it's on his 'customer photos' page, and he took it to some shows before he shipped it to me...thanks for 2/3 of what I paid for, Fran...and 3 years wait to get that part)

          Slant intake.jpg
           
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          • 65 Dartman

            65 Dartman FABO Gold Member FABO Gold Member

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            Looks like a triple Weber intake - individual throttle bodies?
             
          • J Glenn

            J Glenn FABO Gold Member FABO Gold Member

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            Does anyone make a kit, or are people generally adapting v6 injection to their slant6's?
             
          • flingdingo

            flingdingo Well-Known Member

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            Holley makes a Carter BBD-style Sniper that's marketed to the Jeep guys. That might work if you're looking for the drivability of FI. But like Toolmanmike said, port injection is really the way to go on any inline 6. It eliminates all the fuel delivery problems inherent in the looong wet manifold.
             
          • flingdingo

            flingdingo Well-Known Member

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            I'm looking at adapting BMW's 3.5 liter FI stuff, controlled with Megasquirt. It's an inline engine, and really close in displacement to the 225. I may be a bit biased though, as I worked on them for almost 20 years, and am very familiar with the system.
             
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            • 383Scampman

              383Scampman Well-Known Member

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              I would look into using a later model Jeep 4.0L setup with the H.O. intake .
               
            • jos51700

              jos51700 Well-Known Member

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              Wasn't Pishta making these? I thought I remember him doing a pretty good job of this.
               
            • wish4hemi

              wish4hemi Well-Known Member

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              Not worth it to adapt a system. It used to be back when turn-key aftermarket solutions weren't available. I did the research (and others have) to adapt a 454 TBI system on to a 440. And GM 3800 port injection to a 225 slant. It made sense 15 years ago, but now you can get an aftermarket setup with full technical support for so cheap these days that it is not in any way feasible to try and adapt an old system.

              The Holley 2300 EFI system is $850 for the base kit and FiTech has a similar offering for $795. If you have a stocker slant 6, one of those is your best bet.
               
              Last edited: Dec 31, 2018
            • flingdingo

              flingdingo Well-Known Member

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              Both of those systems are still a TBI into a wet manifold. Port injection will be much more efficient, and potentially make more power.

              As I said earlier, fine if you're just looking to enhance driveability, but not the best choice for an inline engine. Especially if you are willing to/have the ability to play around.
               
            • my68barracuda

              my68barracuda Well-Known Member

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              Have to agree with that, why spend money on fuel injection system that has a wet manifold.
              I run a MS3 Pro on a slant.
              Using Ford blue top injectors in a Clifford intake that has the nitros bosses drilled to accept the injectors. A gm 3.8/5.0 throttle body matches up with the other gm engine sensors. The MS3 also runs the ignition, using a locked lean burn distributor to fire a MSD box. I ran into an issue with underhood electronic interference, which is not uncommon with aftermarket FI, got that resolved and all is good.
              I plan to set it up to run E85 next year to take advantage of the higher octane and run higher compression.
               
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              • RustyRatRod

                RustyRatRod Weenie idiot loser. FABO Gold Member

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              • RustyRatRod

                RustyRatRod Weenie idiot loser. FABO Gold Member

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                Do you have some pictures please?
                 
              • flingdingo

                flingdingo Well-Known Member

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                I'd like to see your setup also
                 
              • my68barracuda

                my68barracuda Well-Known Member

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                this photo shows the fuel rail, Clifford intake, ported throttle body, this was taken prior to setting up the MDS ignition, when a HEI was in use.
                I cannot get more recent photos as the car is stripped for upgrades over the winter.

                broller 1.jpg

                fi1.jpg
                 
                Last edited: Jan 1, 2019
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                • 67Dart273

                  67Dart273 FABO Gold Member FABO Gold Member

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                  Most of us would never know the difference between a wet or dry manifold..............'specially on a mild slant..........

                  The big big nonsense about the terribleness of TBI was the era in which they were OEM........and the poor state of development of the surrounding electronics

                  Plus there's been some fairly impressive engine builds with various Holley/ FI / other TBI systems

                  But THE OTHER THING is, you an easily scrape together a TBI, and if you use something like a MS or Holley HP computer, you can convert it later to multiport and still use the same TBI if you want, for a TB on the multiport
                   
                • my68barracuda

                  my68barracuda Well-Known Member

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                  "never know the difference between a wet or dry manifold..............'specially on a mild slant.."

                  Dat tru,, so for a mild slant build, if it was me, I would just stay with a carburetor. Save the money that would be spent on
                  a TBI system and spend that on a nice set of wheels, a lot more people will notice.
                   
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                  • 67Dart273

                    67Dart273 FABO Gold Member FABO Gold Member

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                    Now you are just being silly, OK? You might want to include the rest of my argument.............

                    "Plus there's been some fairly impressive engine builds with various Holley/ FI / other TBI systems"

                    Furthermore there are some pretty impressive systems running "wet."

                     
                  • 64DartGTinAZ

                    64DartGTinAZ FABO Gold Member FABO Gold Member

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                    Yes on the triple Weber intake - throttle bodies are pairs a la 'Dual Webers'
                     
                  • cdnEHbody

                    cdnEHbody Well-Known Member

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                    Go to slant six.org guy on there running it has a good write up on. Get sick of listening to all the experts talk you out of tbi cause "its no good" or "wont work"

                    Has a fitech. Says it.runs excellent. Easy starts when hot or cold. Better mileage. Probably a bit more power id guess.
                     
                  • BillGrissom

                    BillGrissom Well-Known Member

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                    Pishta here made MPFI by drilling ports into a slant head. Unless the Chinese make an intake, you probably won't see an MPFI intake for <$400. Throttle-body injection is much easier, but doesn't fix the mal-distribution that plagues straight-six intakes, though the 4 bbl intakes do have a bigger chamber under the carb that should help. For my 1964 slant, I have several aluminum intakes and injectors w/ rails from a Mopar V-6 that "should work" if staggered. Will look a bit Frankenstein'ed, if I ever get to it. At the intake, you only need to seal for vacuum leaks. Some rodder's have posted a brass plumbing fitting you can use that the injector ends fit snuggly into, then usually epoxy to the intake outside. I wouldn't secure with an internal nut since bad if that falls off and gets sucked into the engine, though you might stake it as they do on throttle plate screws. For fuel control, I have Holley Commander 950 and older Pro-jection 2D. Check back after I'm retired and have time to fool with such. I haven't even been home in 2 weeks.
                     
                  • Mike Cummins

                    Mike Cummins Member

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                    Thanks for your input. Because My car is a simple stock vehicle, this solution sounds reasonable for the money.

                    IMG_20180531_131152.jpg
                     
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