I was hoping someone could tell me the purpose of the very obstructive appearing throttle body gasket on my 2007 4.6 motor.

I had the throttle body off for cleaning the other day and it appears the gasket itself is very large and has a mesh system built into it that situates itself directly in the air intake tract.

What is the purpose of this screen design?
Has anyone ever tried trimming the screen portion off while keeping the gasket portion that seals the tb to truth upper plenum?

I'm sure it has a purpose but I've already addressed one bottleneck with the gotts mod, could this be another?

 

The stock intake has NO bottleneck - it can flow more air than the engine can handle.

 

Can you post a pick? I removed my throttle body a while back and do not remember that.

x2

 

Yes, I will post a pic later to show exactly what I'm referring to.

 

This statement baffles me.
How is it the stock intake has no bottleneck when the factory snorkel is a smaller diameter than that of the throttle body itself.

 

Two reasons:


1) Bernoulli's Principle ( http://en.wikipedia.org/wiki/Bernoulli's_principle )

2) The engine requires LESS cfm @ max rpm than the Stock intake (including the snorkel section) can supply ( https://www.f150online.com/forums/4739726-post9.html ) ...


So - it *may* appear to be a bottleneck IF cfm demands were exceeded, but they're not, so the term is irrelevant.... especially on a 4.6L

 

It's kind of like putting a Holley 850 carb on a Ford 302. Due to volumetric efficiency, there's no way to make use of anything over 600cfm in stock form (i.e. no intake work/head work/forced induction/etc). The stock intake can handle the intake needs of the factory engine. Aftermarket intakes due not generally produce any meaningful amount of power without additional mods to take advantage of it, and can cause a lean condition.

 

Thank you for the intelligent response and the links, I am learning here and alot of that comes from responses like yours.
I was somewhat surprised to see our VE for a 3 valve motor rated at 85 percent though.
I have done forced induction calculations in the past for dual cam 16 valve four cylinders and used similar numbers.

 

Hey MGDfan, you might want to put that one in your sig, you don't get that very often!JK