Quiet noisy intake. (vehicle, coupe, exhaust, engine)

[nick gar]

I have an inline six with a circular, top mounted, intake. This air filter housing draws through a single draw tube facing forward. The muffler is California non-rusted, and like the intake, is OEM.

Problem is when puttering around a parking lot at 5 mph creates a deep drone, enough to pop your ears. Normally, the car is practically silent in any other condition of driving, owing to the I-6 and heavily engineered sound damping construction. Inflation adjusted $90k car, so I feel right in complaining (just not to the manufacturer on a 25 year old car).

Any suggestions to dampen the sound from the intake? If not, I'll have to replace the worn under-hood insulation pad (probably the problem).

[vmaxnc]

Originally Posted by nick gar

I have an inline six with a circular, top mounted, intake. This air filter housing draws through a single draw tube facing forward. The muffler is California non-rusted, and like the intake, is OEM.

Problem is when puttering around a parking lot at 5 mph creates a deep drone, enough to pop your ears. Normally, the car is practically silent in any other condition of driving, owing to the I-6 and heavily engineered sound damping construction. Inflation adjusted $90k car, so I feel right in complaining (just not to the manufacturer on a 25 year old car).

Any suggestions to dampen the sound from the intake? If not, I'll have to replace the worn under-hood insulation pad (probably the problem).

Are you sure it's the intake? A drone is most often caused by the exhaust.

[Lux Hauler]

Are you looking to "cover up" the sound, or eliminate the root cause?

If it is the intake, and you want to eliminate the problem; you will have to find the solution experimentally through different configurations that modify the acoustics of the intake plumbing. You could try installing resonator boxes in-line or simply jutting off the intake piping. Have you considered any aftermarket intake solutions?

[iTsLiKeAnEgG]

Originally Posted by Lux Hauler

Are you looking to "cover up" the sound, or eliminate the root cause?

If it is the intake, and you want to eliminate the problem; you will have to find the solution experimentally through different configurations that modify the acoustics of the intake plumbing. You could try installing resonator boxes in-line or simply jutting off the intake piping. Have you considered any aftermarket intake solutions?

I can't speak for all aftermarket sets but from my experience, aftermarket usually means more noise unless it's something like the CPE intake for my Genesis Coupe which encloses the filter in a box fed by the factory snorkel (much like the OEM intake box but with a different filter/piping design).

[ukrkoz]

That's why they have resonators on newer vehicle intakes. Pop the hood and look at it - see, usually oblong, chamber attached to plastic intake? That's the one.
Though I understand annoyance but, same time, is it something that is original to the vehicle and tinkering with it only lower the value?
Besides, it kinda sounds cool. Like I said - I do understand, but then stop next to any Harley - guys pay millions to make them sound more and more obnoxious.

[nick gar]

Using an OEM parts catalog, I discovered the airbox is missing 6 rubber buffer mounts. Right now it's pretty much floating over the intake manifold, like a big drum skin.

[ukrkoz]

See... Good you didn't ruin vehicle original look - and value. Should be easy fix then.