why shouldn't I make the opening to the tbody completely open, instead of the two holes for the tbody blades? Wouldn't this be kinda like siameseing it?

 

Maybe if you had one throttle blade, but you don't.. so how could that help? Thats about the same thing as putting a 5 inch tip on 3 inch exhaust.

 

Sure you could, however, b/c you have two bores out of the throttle body you run the risk of causing some serious turbulence just behind the TB. Some people have had good experiences with this method, others have not. It's a crap shoot with little to gain.

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"Question with boldness even the existence of a *** ; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear."

-Thomas Jefferson

 

Word,

Listen to the Devil (at least THIS time).

I would suggest matching the port sizes to the throttle bores and smoothly blending them back into the plenum. You don't want to create a turbulent pocket right behind the throttles. However, when it comes to the EGR ports in the floor of the plenum, have at it! I STILL havent figured out why they thought they needed those twin humps in front of those ports...



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Later,
Vader
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"Get UP - Drop the bombshell!"
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Hey Vader thanks for the photos, I already did what you said and what you said in your pdf file, the reason I thought about doing away with the throttle bores is that it looks like the super ram doesn't have them.

 

Perhaps it is due to high-velocity air whizzing in from under those barely-cracked throttle blades. As it whips across those non-shrouded ports, perhaps it resonates like an air column in a pop bottle? ...Just a guess...

...As for siamesing the front of the throttle body, I have given it some thought and dont see how it could be much of a performance disadvantage (or performance advantage for that matter). I'd liken it to the opening on any aftermarket carburated manifold: Square-bore, spread-bore, or universal-fit, they are almost never matched to the throttle blade openings. They are usually just a big, wide hole.

I cannot see where the extra quarter-inch of aluminum in the divider on the front of the plenum could make much difference in the smoothing of airflow. Look on the back side of that divider and you'll see that it's NOT aerodynamic: It's a flat wall!

I honestly have NOT ever cut a divider out, but I leave it in for mostly aesthetic reasons. I do add a radius, though: I cut the inner portion of the divider with a quarter-inch radius, in an effort to reduce some of the dead air behind the divider.

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Daniel Burk
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WS6,

A good hypothesis. Still, I find it difficult to fathom how the powertrain guys could pay such attention to such a small detail when they missed so many other obvious ones, like th ealignment (or lack thereof) of the plenum to the runners, runners to base, intake port match, injector positions, etc.

Still, that would be just like them to concentrate on the one thing that makes no difference except to eliminate a nuisance noise that has no effect on operation.

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Later,
Vader
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"Click - Click - BOOM!"
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