Stroker intake question and guidance, mainly guidance.

Small Block Mopar Engine

  1. JBurch

    JBurch Well-Known Member

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    If you are cutting the divider out, why not just go with a single plane, no divider to cut out to maintain signal strength and by removing the divider you've removed the item that makes the intake a dual plane, as that is what separates one bank form the other..........actually if it were in your budget, go with port EFI, no distribution problems, the only thing the intake has to do is deliver air and the engine could care less what the configuration the manifold is
     
    Last edited: May 15, 2019
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    • yellow rose

      yellow rose Doctor of Thinkology.

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      Ok, flame throwers. Got it now.
       
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      • RogerRamRod

        RogerRamRod The Older I Get, The Faster I Was

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        LOL, I’m probably older than you. Old enough anyway to remember a few friends with those fire hazard air filters. But man, get that & some slappers, air shocks, & a Kraco 40 watt under dash power booster and you were ready to cruise
         
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        • MopaR&D

          MopaR&D Nerd Member FABO Gold Member

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          The purpose of dual-plane intakes is to give better vacuum signal to the carb and separate the cylinders that fire right after each other on the same bank for better fuel distribution. Totally pointless with port EFI, that's why all modern engines run "single plane" intakes with long curvy runners and GIGANTIC plenums (the old 5.0L HO Mustang engines are a good visual example, or a modern Gen 3 Hemi). Most of the bottom-end torque loss you get with a single-plane manifold and carburetor is due to the poor fuel distribution and weak/unsteady vacuum signal at the carb; EFI brings most of that back.

          I haven't measured it myself but it seems like the difference in runner length between a carb'd single and dual-plane is only a couple inches anyway...? I don't think that alone will affect the torque curve much.
           
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          • justinp61

            justinp61 Well-Known Member

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            YR is spot on here. Unless the stroker has very low compression, huge cam, poor heads and is in a very heavy (dump truck) with 2.76 gears run a good single plane intake. A Weiand X-Celerator would be a good one IMO.
             
          • autoxcuda

            autoxcuda Well-Known Member

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            That’s if you take it to a drag strip.

            On the street it’s much harder to hook up. Making the off the line torque not useful.

            Same, if you are autocrossing or road course track day-ing it.
             
            Last edited: May 16, 2019
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            • rumblefish360

              rumblefish360 so close yet so far away

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              Disagree. Dual planes have always shown worse.


              Single planes have shorter runners, one of the reasons they operate at higher RPMs. Longer and/or skinnier runners of the same length make better torque. This also adds to a better throttle response. (Drivability)
               
            • famous bob

              famous bob mopar misfit

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              • famous bob

                famous bob mopar misfit

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                HYYMM, I went to a victor from a torquer 2, and didn`t lose a dam thing , think I gained all the way across / big block stroker tho ----
                 
              • MopaR&D

                MopaR&D Nerd Member FABO Gold Member

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                Fuel distribution is probably better at higher RPMs WOT but what about low-RPM part-throttle, isn't the dual-plane better?

                What I was getting at is I think the separation of the 4 cylinders to their own plenum has more of an effect on drivability than the slightly longer runners... maybe I'm wrong though my stock 318 came with the split-single plane 2-bbl intake and that obviously didn't have drivability issues.
                 
              • yellow rose

                yellow rose Doctor of Thinkology.

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                Since air has to follow the laws of physics, the answer is no, distribution is NOT better with a DP manifold.

                Since air has to follow the laws of physics, any time you put a corner in something you damn well better know why you're doing it.

                The correctly sized single plane intake will always make more power everywhere than a DP intake. Always. You just have to get the rest of it right.

                Just like a tunnel ram will always make more bottom end power than any single 4 intake. Always. You just have to get the rest of it right.
                 
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                • rumblefish360

                  rumblefish360 so close yet so far away

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                  Thanks but there not mine.
                   
                • mbaird

                  mbaird mbaird FABO Gold Member

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                  Let me get this straight.
                  We have a 4" torque monster stroker motor with a torque inducing camshaft , a 3500 stall torque convertor that can sfread any tire we put behind it and we are concerned about loosing some bottom end power ? Because it will be street drven....

                  hmmm.

                  Wont the 3500 stall convertor bypass the low end grunt ?
                   
                • rumblefish360

                  rumblefish360 so close yet so far away

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                  On a track launch yes. If it is a good converter, it will drive around well.
                   
                • flyfish

                  flyfish C8H18+N2O = :-D

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                  I ran the Air-gap and Victor on my old 410 motor. The Air-gap was only ~1 tenth slower at the track (10.89vs 10.7x) under similar air conditions. I thought the Air-gap had better throttle response...felt a little more torquey (if that's a word)...but since I race more than I drive on the street, I stuck with the Victor. Obviously this is combo dependent, so here is what I was running at that time.

                  410 stroker, small street roller (248/254 @0.05, ~.575 lift), ported Eddy's, Air-gap with 1" tapered spacer, 750 carb (gasoline), 10.8:1 compression, 8" converter, 727, 4.10 gear, 3200# Barracuda.

                  I would go with the Air-gap.
                   
                  Last edited: May 16, 2019
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                  • superchargeddrt

                    superchargeddrt FABO Gold Member FABO Gold Member

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                    I think what he's saying is that the filter elements in that type of air cleaner tend to catch fire after a backfire.
                     
                  • MopaR&D

                    MopaR&D Nerd Member FABO Gold Member

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                    Well I'm glad I put LA-pattern heads on my Magnum I'll have to experiment now. Always wanted to try a tunnel ram and I do have a hole cut in my hood, hmmm
                     
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                    • fishy68

                      fishy68 Tyr Fryr's Inc. FABO Gold Member

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                      I hope that magnum block has been drilled so it'll oil the rockers
                       
                    • 70aarcuda

                      70aarcuda Master Hoader of SBM FABO Gold Member

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                      I think he is referring to the intake manifold bolt pattern.....
                       
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                      • MopaR&D

                        MopaR&D Nerd Member FABO Gold Member

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                      • famous bob

                        famous bob mopar misfit

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                        They will disinigrate and get the particles in eveything in the carb if left there too-----
                         
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                        • QuickDart360

                          QuickDart360 Well-Known Member

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                          Victor 340. Got one on a stock stroke 360. Does good I think. But since you already have an M-1 I would just use it.
                           
                        • famous bob

                          famous bob mopar misfit

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                          A throttle body will get its vacuum signal from 1/2 of the engine on a dual plane , cutting the divider may help a little , but why half ass it , when u wont lose a thing w/ a single plane if everything is right ??
                           
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                          • superchargeddrt

                            superchargeddrt FABO Gold Member FABO Gold Member

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                            Running the Air Gap with a 1" spacer to even out the fuel flow. Some of the Air Gap manifolds come with a notch in the divider so a spacer is not needed Engine is Fitech injected.

                            IMG_20180525_152508408-800x600 (1).jpg
                             
                            Last edited: May 19, 2019
                          • rumblefish360

                            rumblefish360 so close yet so far away

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                            I have noticed that some of my Chevy friends have still opted for the spacer in there RPMs even though they have the as cast center divider notched on there small block intakes.
                             
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