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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
I recently purchased a -96 Cherokee and I want to know what the "big plastic box" that connects the airbox to the intake is?
I live in Sweden so my car is EU spec so perhaps thats why mine has it or is it specific to the 1996 since most XJs seems to not have it?
Don't rip it off tho. Apparently it does other stuff:
Originally Posted by Google
The primary purpose of the air intake resonator is to inhibit pressure wave harmonics, which causes air pressure in the engine and restricts the amount of airflow through the RPM spectrum. In effect, the air intake resonator, via its expansion chamber, slows down the air emerging from the engine. This reduces the engine intake noise and increases the amount of horsepower available.
It keeps the intake noise down when you have the accelerator pedal all the way down
that is the main reason imo, all inductions are a compromise on a road car
All 3 of my (Australian) '96 have it, as do they all others I have seen
A lot of guys here remove it, and replace it with either a snorkel, or short trunk hose..some believe it to be either restrictive and/or (a heat soak in a hot climate)
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.
Identifying a part on my new 96 XJ
