Intake Resonator plug size

[stealdesk]

Does anyone know the size of plug needed once the resonator is cut off?
(Not the sound tube)
Thanks

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[Commbubba19]

Does anyone know the size of plug needed once the resonator is cut off?
(Not the sound tube)
Thanks

Measure the outside diameter of the hole and then go to Lowes and find a rubber plug that has the inside diameter matching or slightly (very slightly) smaller than the measurement you took.

 

[stealdesk]

Measure the outside diameter of the hole and then go to Lowes and find a rubber plug that has the inside diameter matching or slightly (very slightly) smaller than the measurement you took.

I cannot do that as I don`t the the car here with me right now.

 

[HISSMAN]

1-5/8 inch outer diameter

 

[Thundersteel]

I know this is an old post, but deleting the intake resonator reduces engine power. It's not there just to make things quieter.

 

[HISSMAN]

I know this is an old post, but deleting the intake resonator reduces engine power. It's not there just to make things quieter.

Your information and where you received it...incorrect.

 

[Thundersteel]

Your information and where you received it...incorrect.

I respectfully disagree:

To the average hot-rodder, intake resonators go on the same pile as smog pumps, catalytic converters, exhaust gas recirculation valves and charcoal canisters. But imagine which pile the resonator would end up in if that same customizer knew it was more than a plastic muffler -- it's actually an important part of the engine's intake system, and may add a fairly significant amount of horsepower.

Design and Construction
The resonator itself couldn't be simpler in design; it's basically just an expansion chamber or wide spot in the otherwise-smooth intake pipe. It may or may not contain some kind of baffle or plate, depending upon the design and the intent of the designers. Resonators come in two types: In-line resonators are open chambers that sit in the intake tube, while side-branch resonators are chambers that sit next to the tube and are connected to it via a small duct or channel.

The Common Misconception
Most hot-rodders and car enthusiasts think of intake resonators as simple mufflers in the intake tube, devices designed to siphon all the awesomeness out of a car's sound track to appease soccer moms and senior citizens. That makes it a prime candidate for the "chuck-it" school of auto modification. After all, it's basically just a plastic tumor growing off of a tube that should by definition be as smooth and blemish free as possible. While sound control is indeed part of the resonator's job, the sound control itself is really more of a side effect of its primary purpose.

Pressure Wave Harmonics
Air flowing into your cylinder head's intake port doesn't move in a straight line while the valve is open, then politely stop in its tracks to await another valve opening. When the valve closes, the moving column of air slams into it, then compresses and bounces back like a spring. This pressure wave travels backward at the speed of sound until the intake runner opens up or it hits something, and then it bounces back toward the cylinder. This is the "first harmonic." The pressure wave actually bounces back and forth two or three more times before the intake valve opens again.

Intake Tube Pulses
The resonator in your intake is technically known as a Helmholz resonator, an acoustic device used to control pressure wave harmonics. Air bouncing back out of your engine and into the intake tube doesn't do it in a single pulse the way it would in a single intake runner; the multiple pistons put out pressure waves at their own intervals, and some of those are going to try to bounce back in while others are going out. The result is a "clog" or high pressure area in your intake tube that ultimately limits airflow through almost the entire rpm spectrum.

The Resonator
Adding an expansion chamber to the intake tube forces air coming back out of the engine to slow down to fill the cavity, thus expending a great deal of its energy and slowing the pressure wave reversion. This slowdown allows fresh air to flow toward the engine without fighting pressure reversion waves the entire way, thus aiding in cylinder filling. Since these pressure waves are essentially sound, giving them a place to expend their energy before exiting the air filter box ends up dampening the intake noise and quieting the engine. Thus, the resonator helps to make the engine paradoxically quieter and more powerful.

 

[HISSMAN]

Yes. But what you are talking about is not what is built into the mustangs intake. This is a cabin sound resonance tube. Not an expansion system.

 

[TexasRebel]

Yes. But what you are talking about is not what is built into the mustangs intake. This is a cabin sound resonance tube. Not an expansion system.

Both exist. The OP was not talking about the sound resonance tube.

 

[tom_sprecher]

Thanks for the explanation. It this the resonator?

Fluid dynamics is a fascinating science that because you usually can not "see it" the average Joe has no concept of what is going on.

We were doing some pulls with a 914-6 with carbs and at the right RPM all of a sudden you could see the gas mist rise out of the velocity stacks. It got pretty dense and high (1.5" above the horn) at one point.

 

[TexasRebel]

I think that's it.

My stock airbox is in a pile of intake parts. If I remember, Ill grab a picture tonight.

http://www.fordparts.com/Commerce/P...search=true&year=2016&make=Ford&model=Mustang

The parts pages show two chambers. One pre- and one post-filter.

 

[D BERRY]

I respectfully disagree:

To the average hot-rodder, intake resonators go on the same pile as smog pumps, catalytic converters, exhaust gas recirculation valves and charcoal canisters. But imagine which pile the resonator would end up in if that same customizer knew it was more than a plastic muffler -- it's actually an important part of the engine's intake system, and may add a fairly significant amount of horsepower.

Design and Construction
The resonator itself couldn't be simpler in design; it's basically just an expansion chamber or wide spot in the otherwise-smooth intake pipe. It may or may not contain some kind of baffle or plate, depending upon the design and the intent of the designers. Resonators come in two types: In-line resonators are open chambers that sit in the intake tube, while side-branch resonators are chambers that sit next to the tube and are connected to it via a small duct or channel.

The Common Misconception
Most hot-rodders and car enthusiasts think of intake resonators as simple mufflers in the intake tube, devices designed to siphon all the awesomeness out of a car's sound track to appease soccer moms and senior citizens. That makes it a prime candidate for the "chuck-it" school of auto modification. After all, it's basically just a plastic tumor growing off of a tube that should by definition be as smooth and blemish free as possible. While sound control is indeed part of the resonator's job, the sound control itself is really more of a side effect of its primary purpose.

Pressure Wave Harmonics
Air flowing into your cylinder head's intake port doesn't move in a straight line while the valve is open, then politely stop in its tracks to await another valve opening. When the valve closes, the moving column of air slams into it, then compresses and bounces back like a spring. This pressure wave travels backward at the speed of sound until the intake runner opens up or it hits something, and then it bounces back toward the cylinder. This is the "first harmonic." The pressure wave actually bounces back and forth two or three more times before the intake valve opens again.

Intake Tube Pulses
The resonator in your intake is technically known as a Helmholz resonator, an acoustic device used to control pressure wave harmonics. Air bouncing back out of your engine and into the intake tube doesn't do it in a single pulse the way it would in a single intake runner; the multiple pistons put out pressure waves at their own intervals, and some of those are going to try to bounce back in while others are going out. The result is a "clog" or high pressure area in your intake tube that ultimately limits airflow through almost the entire rpm spectrum.

The Resonator
Adding an expansion chamber to the intake tube forces air coming back out of the engine to slow down to fill the cavity, thus expending a great deal of its energy and slowing the pressure wave reversion. This slowdown allows fresh air to flow toward the engine without fighting pressure reversion waves the entire way, thus aiding in cylinder filling. Since these pressure waves are essentially sound, giving them a place to expend their energy before exiting the air filter box ends up dampening the intake noise and quieting the engine. Thus, the resonator helps to make the engine paradoxically quieter and more powerful.

Define "fairly significant amount of horsepower" please. Does it fall into the category of this spacer will add up to ? amount of horsepower? A very interesting point this.

 

[Chef jpd]

My solution after cutting off the mushroom top of the tube.
Standard wheel center. Silicone atv and done

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