Heimholtz resonance

[cammerfe]

I've done a bit of digging regarding resonance in induction tracts and found one outstanding point. In order for Heimholtz resonance to affect performance in any way, the chamber(s) must be to the engine side of the throttle body. The little chambers attached to the plastic intake duct are purely for noise attenuation. Let the hoo-haa begin !!!!
KS

 

[PetesSweets86]

lol let us know how it goes with that

 

[joegr]

I've done a bit of digging regarding resonance in induction tracts and found one outstanding point. In order for Heimholtz resonance to affect performance in any way, the chamber(s) must be to the engine side of the throttle body. The little chambers attached to the plastic intake duct are purely for noise attenuation. Let the hoo-haa begin !!!!
KS

Okay, but what about Helmholtz resonance?

 

[Lincoln Jealous]

cut them off, and let us know how it goes! make a sound video!

 

[Aquabrit]

Well, that was always my understanding of the Helmholtz resonator in vehicle induction use. (reduced NVH)

If what you have found out is accurate, then I'm glad. (I have a smoothed intake tube for my Mark which I hadn't put on just in case it adversely affected performance)

 

[Quik LS]

ken - the design point is to have the cambers cancel the standing wave patterns the develop in the intake track. The standing wave both makes noise and can reduce effienency by creating buffeting.

your point about before or after the throttle body is moot at WOT - as the entire track becomes an extension of the intake manifold.

now - the typical design compromise occurs to tune down the noise levels at the 'standard' driving loads (rpm and speed) reguardless of performance (not really reguardless but with a trade-off).