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Increasing capacity of intake manifold 

 

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 Post subject: Increasing capacity of intake manifold
Posted: Tue Oct 24, 2006 12:48 pm 
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was looking at the cast intake manifold off an el, it looked like there was a fair amount of excess steel sitting in the chamber (a main cross member plus a couple of other areas), im not sure if its there to maintain some sort of air flow or not, but if the manifold was to be cut and most of this steel removed from inside it, leaving one big hollow chamber, this would increase the capacity for air within it, would this be worthwhile or not? anyone tried it?

 

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Posted: Tue Oct 24, 2006 1:28 pm 
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why not just put a box plenum on top like others have?

much less stuffing around
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Posted: Tue Oct 24, 2006 1:43 pm 
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That 'excess steel' is to create the dual runner lengths the BBM has.
It switches from long runners (for good low down torque) to short runners (for top end power).

 

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Posted: Tue Oct 24, 2006 2:14 pm 
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SileNceR wrote:
why not just put a box plenum on top like others have?

much less stuffing around


On top? Like remove the top half of the BBM and fit an aftermaket one? I would of thought in NA application the duel runner system on the BBM would be better than a plenum chamber set up.

 

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Posted: Tue Oct 24, 2006 3:55 pm 
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the only time i've seen the plenum idea done was with a forced induction.. ie pyroay has had a plenum top half made up and rmyers has taken out the BBM butterflies and opened up the chamber completely but again this isnt NA..
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Posted: Tue Oct 24, 2006 6:07 pm 
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What Rymers has done, didn't Ford do the similar thing on the XR6T's? A BBM with no butterflies.

 

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Posted: Wed Oct 25, 2006 12:59 am 
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svo_xr6 also removed the top of the plenum and put on twin throttle bodies?

 

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Posted: Sat Jan 27, 2007 2:53 pm 
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you might be hard pressed finding steel in the cast aluminium manifold.. unless your going to decrease the size of the steel in the butterflies.... or the gasket...

 

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