Decided to go ahead and start the process on designing everything for the custom induction.
I figured you guys would like to see what the induction setup looks like from the scan data.

 

Wow, that's a lot of weird crap on that thing.

 

It's understandable by a gastroenterologist.

(subscribed to thread)

 

Noise cancelling 1/4 wave chambers.

 

One would guess they would have liked to have done one large chamber, but they made the best of the room they had. Sure looks like a LOT of thought went into that, by a bunch of smart engineers.

Dave

 

The 4.2s had a bunch of blower whine, which isn't necessarily a BAD thing, and the 5.0s don't have any noticeable whine at all, which isn't necessarily a BAD thing......... There should be some servos or something somewhere that block off the chambers when in DYNAMIC MODE, for extra fun noises.

 

How's those 5.0L headers coming along?

 

Eurotoys upper and lower pulleys = enough whine to make it obvious it's blown, but not so much that it sounds like a drill. There is a servo that adjusts the whine... it's called the throttle body. Lol...

 

Investing in couple projects at moment, 5.0L highflow cats first, then I'll finish the header. Flanges made, collecters are fabbed, just need to lift and start fabbing. Just have had a lot of other client projects slowing me down.

 

One large chamber would be counterproductive.
Flow destroying resonance and standing waves occurs at different frequencies and at different points in a tube. So you need chambers tuned to specific frequencies at different points. The science is harder than 3dimensional chess to me, in just getting air to flow through a tube, but this tube is attached to an air pump (the engine), and they are using these cylinders on the intake to take pulses out of the engine primarily.

 

Doesn't work that way, different volume / length / diameter to cancel different frequencies and God save you if resonance or harmonics come into play. The small chambers effect higher pitches noises. I'd bet there's more testing and design into Noise / Vibration / Harshness versus any other dynamic on a chassis. Gentlemen want a quiet hot rod and so does the government. Passing the drive by noise levels can be difficult for econoboxes much less grand touring supercars.

 

Learn something new everyday, thanks!

Dave

 

This is not for noise control or quietening.
The XKR actually has a contraption for sending more sound to the cabin.
This is to increase the flow into the engine.

 

Flanges and collectors are the easy part. Did you ever put a stock manifold on a flow bench to see what you're starting out with? I'm not saying it's gods gift to manifold design, but with tuners getting 600+ HP out of these engines at relatively modest boost pressures and the stock manifolds, I question whether a low-mid four figure set of headers is going to be that much better than a set of extrude honed stockers... especially when you can pick up a spare set to send off for under $200 on eBay.

 

Disagree. They are absolutely for cancellation of a designated frequency.

For best flow, it would be perfectly smooth.

They likely wanted to pipe in the noise in the cabin after they cleaned it up.

 

I think that unless you have a PhD in fluid dynamics, you really aren't in a position to speak in absolute terms regarding intake resonators and their purpose/ function. Quit speculating and posting bs based on 50 year old wives tales.

Me? I'm just a guy that knows how to research and regurgitate. Scroll down to figure 9 if you like pictures instead of words: https://www.researchgate.net/publication/288944484_Computational_analysis_of_air_intake_sys tem_for_internal_combustion_engine_in_presence_of_ acoustic_resonator

 

A smooth tube does not have the best flow- it creates standing waves. look it up.
Sends air in the opposite direction.
Too complex to explain in one post.

The remedy is to have chambers that catch/cache the pulsation.

 

Same science in acoustic wave propagation. Perhaps even greater complexity.
That article cleared one thing up for me- there is software to help in the design.
In case anyone missed the punchline (as this comes up often):"An intake system with resonator gives a significant improvement of volumetric efficiency at medium and high speed compared to the intake system without resonator. "

 

Maybe I do.

 

Hand on heart- I said to myself the joke is on Mandrake because this guy probably teaches Fluid Dynamics at doctorate level or in charge of presidential tweets.