Air intake resonators & the science behind it.

[WildHorse]

Just read this: https://itstillruns.com/air-intake-resonator-do-12156112.html it says it's basically a Helmholtz resonance chamber https://newt.phys.unsw.edu.au/jw/Helmholtz.html, which controls Pressure Wave Harmonics http://hyperphysics.phy-astr.gsu.edu/hbase/Waves/funhar.html. Hence the reason why it's there on stock intake airboxes. Which begs the question, why are none to be found on aftermarket CAI's?

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[Jay-rod427]

Because anyone putting one on doesn't care about the sound dampening abilities. As far as the "science" behind it helping the engine pulses it's simply too far away from the intake valves especially on a common path intake to make a real difference. Manufacturers put them on for sound control, yet the brilliant mustang engineers then decide to pump the intake sound into the cabin....

 

[rebellovw]

Because anyone putting one on doesn't care about the sound dampening abilities. As far as the "science" behind it helping the engine pulses it's simply too far away from the intake valves especially on a common path intake to make a real difference. Manufacturers put them on for sound control, yet the brilliant mustang engineers then decide to pump the intake sound into the cabin....

What the hell is so wrong with passing some intake sound into the cabin? As long as it is real - I think it is a clever idea. New cars are so sealed up - you cannot hear a thing - this wasn't an issue with older cars where you could hear your carbs. Kills me that so many act so superior over it.

 

[Jay-rod427]

What the hell is so wrong with passing some intake sound into the cabin? As long as it is real - I think it is a clever idea. New cars are so sealed up - you cannot hear a thing - this wasn't an issue with older cars where you could hear your carbs. Kills me that so many act so superior over it.

Nothing at all. I'm just saying they muffle the sound with a resonator chamber, then have to plumb it into the cabin because you otherwise wouldn't hear the engine purr. Older cars with carbs didn't have these newfangled resonators muffling the sound down either;)

 

[offroadkarter]

What the hell is so wrong with passing some intake sound into the cabin? As long as it is real - I think it is a clever idea. New cars are so sealed up - you cannot hear a thing - this wasn't an issue with older cars where you could hear your carbs. Kills me that so many act so superior over it.

Think of it this way. Why did they add a device that helps to mute sound, only to then follow it up with a device that amplifies sound?

It's not that the sound tube itself is bad, it's more that it seems counter productive to quiet down the induction noise, then increase the induction noise and pipe it directly at the driver.

 

[Jay-rod427]

Think of it this way. Why did they add a device that helps to mute sound, only to then follow it up with a device that amplifies sound?

It's not that the sound tube itself is bad, it's more that it seems counter productive to quiet down the induction noise, then increase the induction noise and pipe it directly at the driver.

 

[rebellovw]

Think of it this way. Why did they add a device that helps to mute sound, only to then follow it up with a device that amplifies sound?

It's not that the sound tube itself is bad, it's more that it seems counter productive to quiet down the induction noise, then increase the induction noise and pipe it directly at the driver.

There could be many reasons they came up with that air filter box design - sure some sound deadening but also some other common purposes (keep dirt out) used from other cars and manufacturing.

But I do think they heard the sound and thought - damn - that sounds pretty nice - too bad we cannot hear it.....I gotta idea...

I'm totally ok with it just as long as it isn't coming from my speakers.

 

[rebellovw]

Active Exhaust can likely be treated the same - it plays with the volume likely w/o adding anything other than sound.

 

[WildHorse]

it's simply too far away from the intake valves especially on a common path intake to make a real difference

Well there's one before and after the airbox. Did you read the articles?

 

[rebellovw]

No I didn't read it - I looked at it and cracked up (not that the article was bad) because I was thinking about those old hokey pin wheel superchargers they used to advertise earlier today - and saw an ad for on on the article.

I only had a beef regarding the sound tube - nothing regarding the article.

Carry on.

 

[CVCashmere]

I read the first article and found it interesting. This explains why I have one of those appendages on both my Mustang and Fusion.

Note: here is a tip I learned by accident: the air inlet tube on the 2018 5.0 is larger than the 2015-17, allowing more air to enter, based on load. You have to change the air box, and the body it connects to at the manifold. May be cheaper than an aftermarket conversion???

CVCashmere

 

[BmacIL]

What the hell is so wrong with passing some intake sound into the cabin? As long as it is real - I think it is a clever idea. New cars are so sealed up - you cannot hear a thing - this wasn't an issue with older cars where you could hear your carbs. Kills me that so many act so superior over it.

Because it makes for a bad combination of sounds with anything louder than the whisper-quiet stock 15-17 exhaust, and it adds cost to a car where they could just make the exhaust a little bit louder. There was drone in the cabin with a just a resonator delete and the sound tube connected. Capping it off got rid of it. Capping or removing it also reduces peak sound intensity under regular driving with catbacks like the Corsa Sport too.

 

[rebellovw]

Because it makes for a bad combination of sounds with anything louder than the whisper-quiet stock 15-17 exhaust, and it adds cost to a car where they could just make the exhaust a little bit louder. There was drone in the cabin with a just a resonator delete and the sound tube connected. Capping it off got rid of it.

Understood - but I've always liked two kinds of sounds - Intake and Exhaust. Nothing like driving an older car with 2-3 side draft Mikuni carbs Or an old 60's GTO that sounds like it is going to suck the hood off. Love a good intake.

Anyhow - I'm good with both at the moment (Ford Perf X Pipe and stock 18 exhaust) - perhaps when I get that Corsa Sport - I'll reconsider.

 

[rebellovw]

I've also read what others have said - that they couldn't tell much of a difference after sound tube delete- so perhaps I'm giving it too much credit.

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