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    S54 intake plenum and runner shape and design.

    As more and more options become available, designs change. Anyone care to explain some theory regarding why plenum and runner design/shape/size vary to the almost unrecognizeable? Here are some of the designs... Click here to enlargeClick here to enlargeClick here to enlargeClick here to enlargeClick here to enlarge

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    Generally a tapered log style with internal velocity stacks is the best for even distribution of air per cylinder from my understanding.

    http://horsepowercalculators.net/int...anifold-design

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    I really love the way the HPF manifold looks, I just hate that hks blow off valve they use! lol

    If they could slap a tial on there instead that would be great. Does anyone make an adapter ?
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    yes the HPF one has both good pressure recovery (gradual diversion of the walls from the inlet) and presents a good chance for equal distribution to each cylinder which is harder on an I6 than most other configurations

    The technica one looks poor in regard to both these characteristics.

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    Click here to enlarge Originally Posted by folgrz Click here to enlarge
    I really love the way the HPF manifold looks, I just hate that hks blow off valve they use! lol

    If they could slap a tial on there instead that would be great. Does anyone make an adapter ?
    The initial BOV's used waaaaaay back were Tials

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    Thanks! Nice article! Click here to enlarge but then, why do people go other routes if that is less efficient? There is a given space to use. What i get from this is that maybe the shape of the plenum do not have as much affect on performance as one would think... ? Click here to enlarge
    Click here to enlarge Originally Posted by Torgus Click here to enlarge
    Generally a tapered log style with internal velocity stacks is the best for even distribution of air per cylinder from my understanding.

    http://horsepowercalculators.net/int...anifold-design

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    Click here to enlarge Originally Posted by Petrolhead Click here to enlarge
    What i get from this is that maybe the shape of the plenum do not have as much affect on performance as one would think... ? Click here to enlarge
    Just the opposite.

    The issue is that most people have no reference point to compare to...

    It is a widely accepted truth in the racing industry that whomever has a bigger pile of stuff that was tried, and didn't work, is likely to be making the most gains. What they are usually talking about Pro-Stock or Pro-Mod drag racing for example, is intake manifolds...

    I personally built an intake manifold that I thought was going to work a certain way, and it looked the business, but I ended up losing a ton of torque in the midrange.

    All of the S54 intake manifolds we are seeing built out of aluminum are for FI applications, so there is a second component to the total engine VE that usually complicates the results. (It's not so clear how the intake actually works)

    What I think most people miss is that flow velocity with FI changes minimally; the difference in mass flow going through the engine is from a change in flow density. All of the principles of flow that apply to an N/A engine are still in play....
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    Click here to enlarge Originally Posted by Torgus Click here to enlarge
    Generally a tapered log style with internal velocity stacks is the best for even distribution of air per cylinder from my understanding.

    http://horsepowercalculators.net/int...anifold-design
    Fantastic article.

    This is pretty telling:

    Click here to enlarge

    Click here to enlarge

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    Click here to enlarge Originally Posted by PEI330Ci Click here to enlarge
    Just the opposite.

    The issue is that most people have no reference point to compare to...

    It is a widely accepted truth in the racing industry that whomever has a bigger pile of stuff that was tried, and didn't work, is likely to be making the most gains. What they are usually talking about Pro-Stock or Pro-Mod drag racing for example, is intake manifolds...

    I personally built an intake manifold that I thought was going to work a certain way, and it looked the business, but I ended up losing a ton of torque in the midrange.

    All of the S54 intake manifolds we are seeing built out of aluminum are for FI applications, so there is a second component to the total engine VE that usually complicates the results. (It's not so clear how the intake actually works)

    What I think most people miss is that flow velocity with FI changes minimally; the difference in mass flow going through the engine is from a change in flow density. All of the principles of flow that apply to an N/A engine are still in play....
    Thanks! But then i ask myself: why do the design vary to the extreme between different manufacturers, when they perform so differently?

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge



    Curious to see what would happen if you boost a CSL CF box :p

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