Meant to take a photo while I had it out, but forgot in my rush to get the engine running late last night .

There is a rubber gasket that seals the TB to the intake plenum and it has a partial copper grill mounted to its upper half (part# 22271-75031). The grill is roughly the shape of an inverted 'U' with center maybe 1/4 the gasket diameter and legs maybe 1/3. The gasket is at a mild downward angle on the TB side top/end of the plenum (and flush to the TB). I'm interpreting it as a diffusion grill, perhaps for the purpose of slowing the upper TB air flow where it enters the plenum, or perhaps for something else?

Does anyone have any specific knowledge of what that grill is intended to accomplish? Has anyone tested intake/engine behavior with Vs without it (the grill, that is, not the gasket)?

Any helpful info appreciated !

Thanks -- Trevor

 

i have no idea. im just here incase its discovered that removing this gril adds +25 whp.

 

x2.

 

Well, I chased my tail on that question and all I learned was the engine manual mentions it's for smoothing manifold air and spark arrest (no further detail). My bet is butterfly turbulence control, and given the close proximity of the butterfly to the plenum, I doubt simply removing it is a good idea.

 

haha this gave me a good chuckle