Manifold Madness

Discussion in 'Car Builds, Projects, Idea's Experiments' started by Nitrominis, Jul 20, 2009.

  1. Nitrominis

    Nitrominis Banned

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    #1 Nitrominis, Jul 20, 2009
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    [​IMG]
     
  2. Ryephile

    Ryephile New Member

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    The polished manifold will look nice [reminds me of when I smoothed out the intake manifold on my turbo-build, but powder coated it gloss black instead], but what's the rationale for going with the return-line fuel rail?
     
  3. Nitrominis

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    #3 Nitrominis, Jul 20, 2009
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    **[​IMG]
     
  4. jhiggs26

    jhiggs26 New Member

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    Looking good Lynn! How's the flow accross the board now?

    Jeremy
     
  5. Nitrominis

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    #5 Nitrominis, Jul 20, 2009
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  6. Nathan

    Nathan Founder

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    Don't you need some roughness on the interior or the polishing will allow a boundary layer to be created at the surface walls. This causes uneven tension on the air column as it moves through the intake path, which can lead to shearing of the air flow which will reduce the air flow quality and quantity.

    To explain the boundary effect a little better...

    Envision the gas flowing in a conduit and the molecules in direct contact with the conduit wall are by definition not moving. The next molecule out is moving a little but due to friction with the stationary one, it is not as fast as the next molecule out. Speed of the molecules increases as they are spaced away from the wall. This virtually no-flow region is termed the boundary layer and the thicker this is, the worse it is for an intake manifold. Continue looking at the molecules as you go to the center of the flowing stream and you will find they get faster and faster until the very center ones are fastest of all.
     
  7. Way Motor Works

    Way Motor Works New Member

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  8. Nitrominis

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    #8 Nitrominis, Jul 21, 2009
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  9. Nitrominis

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    #9 Nitrominis, Jul 21, 2009
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  10. Nitrominis

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    #10 Nitrominis, Jul 21, 2009
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  11. Nitrominis

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    #11 Nitrominis, Jul 22, 2009
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  12. Nitrominis

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    #12 Nitrominis, Jul 22, 2009
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  13. SK8BRD

    SK8BRD New Member

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    Nathan,

    [ame="http://en.wikipedia.org/wiki/Boundary_layer"]Here[/ame] is a discussion of boundary layer.

    And [ame="http://en.wikipedia.org/wiki/Reynolds_number"]here[/ame] is a disappointing article on Reynold's number.

    Only one cylinder at a time is pulling air, and it's intake valve(s) are much smaller than the diameter of the rest of the system. My overeducated guess is that the intake horns, hoses, etc.. are designed to make sure that a low Reynold's number is obtained, but also designed to minimize raw material. If someone is ambitious enough to polish the cast pieces, it won't hurt and might just help flow some.
     
  14. Nitrominis

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    #14 Nitrominis, Jul 23, 2009
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  15. Nitrominis

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    #15 Nitrominis, Jul 23, 2009
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  16. Way Motor Works

    Way Motor Works New Member

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    WOW I have to say I'm impressed you polished the outside too. That was a ton of work.
     
  17. Nitrominis

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    #17 Nitrominis, Jul 23, 2009
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    **stock casting:
    [​IMG]
     
  18. Deviant

    Deviant Banned

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    I don't want to derail this thread much further but could you or someone else post a how-to on polishing the SC horns to achieve that show-car finish on the outside? I'm assuming a similar system could be used on the inside for some performance gains but my engine's not at that level yet.
     
  19. Nitrominis

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    #19 Nitrominis, Jul 24, 2009
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  20. Nitrominis

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    #20 Nitrominis, Jul 25, 2009
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