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Thread: Manifold with internal velocity stacks away from the interior walls bad on boost?

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    Manifold with internal velocity stacks away from the interior walls bad on boost?

    I was thinking of building an intake with stacks reaching out towards the center of a large cylindrical plenum. Would this be a good idea or is there some reason it is not a good idea on a forced induction motor? Was trying to come up with donor ideas for the plenum.. maybe I could use an old air cylinder that failed pressure test. Couldn't think of anything better that would be the right size and shape and material.
    Last edited by Rrider; 04-10-2012 at 12:47 PM.

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by Rrider View Post
    I was thinking of building an intake with stacks reaching out towards the center of a large cylindrical plenum. Would this be a good idea or is there some reason it is not a good idea on a forced induction motor? Was trying to come up with donor ideas for the plenum.. maybe I could use an old air cylinder that failed pressure test. Couldn't think of anything better that would be the right size and shape and material.
    there is one person on the board who i know of that has his manifold setup like this. I cant see it causing any negative effect. the stacks positioned in the middle of the plenum will help flow non stagment air.....i know i didnt word that the best. but its about all i have right now mentally LOL

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by Juggy View Post
    there is one person on the board who i know of that has his manifold setup like this. I cant see it causing any negative effect. the stacks positioned in the middle of the plenum will help flow non stagment air.....i know i didnt word that the best. but its about all i have right now mentally LOL
    I agree Juggy, it makes sense to me If I recall, Simon didn't think it would work tho.... Link to thread

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    I'm thinking using off the shelf stacks (screw in or bolt on) would give better performance and be less work. If different lengths are available you could play with that too.

    What is the port area on these 2.2 and 2.5 intake manifolds?

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by Rrider View Post
    What is the port area on these 2.2 and 2.5 intake manifolds?
    That would depend on stock or how much the head is ported...

    when I made the one for the 2.4L (link in post 3) the stratus manifold I used was already nicely funneled up to a circle.

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    ^^^^ this is your velocity stack man right here!!! lol

    didnt know u had a thread on the intake build....cool beans.

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    I just want a ballpark diameter so I can start investigating sources for off the shelf stacks. I'd much rather thread or drill bolt holes to secure some stacks than try to radius manifold walls. If we're talking circles, 40mm minimum diameter for 200hp? 50mm for 400hp? I have no clue how that usually goes.. is there a rule a thumb?

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by Rrider View Post
    I just want a ballpark diameter so I can start investigating sources for off the shelf stacks. I'd much rather thread or drill bolt holes to secure some stacks than try to radius manifold walls. If we're talking circles, 40mm minimum diameter for 200hp? 50mm for 400hp? I have no clue how that usually goes.. is there a rule a thumb?
    if i remember correctly. the 2 piece intake lower entry has 1.980" gasket (50.29mm)

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by BadAssPerformance View Post
    I agree Juggy, it makes sense to me If I recall, Simon didn't think it would work tho.... Link to thread
    Sorry Mr physicist, I don't have a degree in fluid dynamics etc,
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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by Rrider View Post
    I just want a ballpark diameter so I can start investigating sources for off the shelf stacks. I'd much rather thread or drill bolt holes to secure some stacks than try to radius manifold walls. If we're talking circles, 40mm minimum diameter for 200hp? 50mm for 400hp? I have no clue how that usually goes.. is there a rule a thumb?
    Guessing you're building this for your car, maybe it would be best to measure the ports on the head you plan to use and calculate the area?

    No diamertical rules of thum as everything else about the engine such as displacement, cfm restrictions and RPM all matter.

    Bolt on stacks would be easier than the ones I had CNC'ed, thats for sure. Measure your ports, calculate area, back-calculate a diameter and there you go...

    ---------- Post added at 06:48 PM ---------- Previous post was at 06:48 PM ----------

    Quote Originally Posted by turbovanman View Post
    Sorry Mr physicist, I don't have a degree in fluid dynamics etc,
    Just messin with ya... I don't either, was my worst class in school, LOL!

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by BadAssPerformance View Post

    Just messin with ya... I don't either, was my worst class in school, LOL!
    Yeah, I know. Glad that thread came up, learned alot,
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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Me too!

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    I have some tuning spares from my bike that are 55mm inside diameter. Sounds like they are about the right size. Anyway if others want stacks like this they are for "RS" carburetors and come in a set of four for a pretty reasonable price in four different lengths.

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    I can sort of see the appeal, but to me it's a bit like spoilers, one might be beneficial, but by the time you've got four stacked up, not so much.... they just interfere with each other.
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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    http://en.wikipedia.org/wiki/Velocity_stack

    Knowing is half the battle.

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Basic article, but good info

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by chilort View Post
    Yeah, in other words, just radius the port entry to get 99% of the effect.
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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by RoadWarrior222 View Post
    Yeah, in other words, just radius the port entry to get 99% of the effect.
    99%? Not sure about that, especially since the radius matters (a small radius might not help much at all) and also I think if its on the floor it may not work as well fo ras many conditions (RPM, velocity, etc)...

    But for forced induction, the height may matter less...

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    I was thinking of running 1 and 3 with different height stacks than 2 and 4. That way they are not trying to steal air from each other.

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    Re: Manifold with internal velocity stacks away from the interior walls bad on boost?

    Quote Originally Posted by BadAssPerformance View Post
    99%? Not sure about that, especially since the radius matters (a small radius might not help much at all) and also I think if its on the floor it may not work as well fo ras many conditions (RPM, velocity, etc)...

    But for forced induction, the height may matter less...
    N/A for sure, my bike as different length's and the aftermarket changes the length and they make more power than the OE ones.
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