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Supercharger for 4.6L or 5.4L V8?

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  • Supercharger for 4.6L or 5.4L V8?

    Has any one tried putting a supercharger on any of the Ford CNG V8s? I'm sure there are plenty available, but I don't know how hard they would be to adapt to a CNG engine. Would there be any problem with a bi-fuel 5.4L V8 in the Ford trucks. I'm thinking it would be less troublesome on a dedicated 4.6L in the Crown Vic.
    www.CNGUtah.com

  • #2
    Re: Supercharger for 4.6L or 5.4L V8?

    that would be sweet!!! you should try it..I bet it will work just like any other super charged gasser...but I am not sure??
    1999 CNG Ford Contour

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    • #3
      Re: Supercharger for 4.6L or 5.4L V8?

      I believe, but am not sure, that the Ford F150 Lightnings have supercharged engines, and that they are 5.4's.
      An engine would need to be programmed to match the fuel injection to the air increase if a turbo were added.
      Most of my knowledge is with diesels. Adding a turbo to a diesel wouldn't add much power unless the pump is set up to increase the fuel as well. However, it won't hurt a diesel just to add a supercharger because diesel eninges run on a wide range of air to fuel ratios.
      A gasoline engine, including CNG, operates only in a relatively narrow range of fuel to air mixture which needs to be closely controlled.
      However, I have thought about that many times. I believe this is one of the first posts I have seen considering high performance in a CNG vehicle. I think most people are still just trying to grasp the workings of the CNG systems.
      Good thought! It is possible, but finding information on it may be the hard part.

      Max

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      • #4
        Re: Supercharger for 4.6L or 5.4L V8?

        I've seen another post about a company possibly making a supercharger for a Civic GX. There's so many turbo kits for Civics, I wonder if one of those would work as well. It may cause problems with the CVTs in the 01-05 models.

        Anyways, yes, the Lightning and Harley Davidson F-150s have a supercharged 5.4L. The 4.6L has been supercharged in some Mustang applications as well.

        Does anyone have any ideas if the computer can figure out that there is that much more air going into the engine and inject more fuel automatically? Or would amount be out of the normal range?
        www.CNGUtah.com

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        • #5
          Re: Supercharger for 4.6L or 5.4L V8?

          One of the bifuel engines would probably be a better match for forced induction because of compression ratio issues. To work, we need some kind of boost controlled fuel enrichment system that does not yet exist.

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          • #6
            Re: Supercharger for 4.6L or 5.4L V8?

            Although it would probably be quite a complicated system, it could also be as simple as as a boost sensor opening and extra nozzle or two. I imagine the timing would need to be adjusted, too.

            A high performance CNG would be having your cake and eating it too!

            Max

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            • #7
              Re: Supercharger for 4.6L or 5.4L V8?

              I would also agree that the compression ratio would be an issue on a dedicated CNG engine. In most instances, forced induction (either SC ro Turbo) prefers a lower compression ratio. However, this is not to say it isnt' doable, but you may be better off adding it as PART of a conversion, and keepnig the stock lower compression ratio.
              1997 Factory Crown Victoria w/ extended tanks ~~ Clunkerized!
              2000 Bi-Fuel Expedition --> ~~ Sold ~~ <--

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              • #8
                Re: Supercharger for 4.6L or 5.4L V8?

                Compression Ration would not be an issue since CNG is 130 octane. You could have a 10:1 motor and I doubt you could find a supercharger or a turbocharger that could produce enough boost to hurt the motor.

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                • #9
                  Re: Supercharger for 4.6L or 5.4L V8?

                  Any thoughts on a converting a Cobalt SS Supercharged? Love my car, love the price of CNG.
                  --------------------------------
                  1999 Ford Crown Victoria
                  Dedicated CNG Interceptor

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                  • #10
                    Re: Supercharger for 4.6L or 5.4L V8?

                    Any progress on Supercharger info? Looking to pep up my CNG Crown Victoria a bit.
                    --------------------------------
                    1999 Ford Crown Victoria
                    Dedicated CNG Interceptor

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                    • #11
                      Re: Supercharger for 4.6L or 5.4L V8?

                      I believe the bi-fuel engines running in CNG mode run a speed-density injection scheme. This means the ECU is mainly looking at MAP(Manifold Absolute Pressure) and IAT (Intake Air Temperature) to adjust fueling. For the most part on modern engines the MAP and IAT sensors are 0-5V It is possible that the compu-valve would adjust fueling beyond 0 Vacuum and onto boost I just don't think anyone has tried. It is possible that you could use some sort of boost sensor to skew either the MAP signal or IAT to trick the ECU into adding more fuel. Some of the first Honda Civic turbo kits included a device called the "Missing Link" which basically fooled the ecu into thinking there was an acceptable amount of air entering the engine when really the engine was seeing boost.

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                      • #12
                        Re: Supercharger for 4.6L or 5.4L V8?

                        http://www.thebugbox.com/crownvic/blower.gif

                        Picture of Allen Engine Development kit. Ventura, CA ?
                        Last edited by p71; 08-18-2008, 04:13 PM.

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                        • #13
                          Re: Supercharger for 4.6L or 5.4L V8?

                          I talked to Jared at Sno-Motion about turbocharging a 5.4 L bi-fuel and he didn't think it was very doable, and thought it would be better to incorporate it into a conversion. Evidently the Ford computers aren't really programmable due to copyright or something? I had called Squire Turbo Systems in Orem, and they were willing to help out, but I'm not sure they've ever worked on a CNG vehicle before, so I was hoping I could get the 2 local shops to work together, but I didn't get very far.

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                          • #14
                            Re: Supercharger for 4.6L or 5.4L V8?

                            any updates on this?? Im thinking os swaing a 03/04 Cobra engien into my 04 CNG Vic. I'm gathering its more work than it seems...

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                            • #15
                              Re: Supercharger for 4.6L or 5.4L V8?

                              CNG loves turbo or Supercharged engines. I have converted many VW/Audi turbo charge cars to run on CNG. You need a kit that is designed to work with boost.
                              Bob Mann

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