With all due respect, I think you're wrong on this one. The cone is a
Hemholtz resonator, and its sole function is to quiet the intake noise.
Removing it gives you slightly better throttle response (and a nice throaty
sound), but yields no real HP gain.

Dave


>When you guys say that you are removing the cone from you airbox, do you
>mean the horn on the inside of the filter?  I don't know what was said
>in the Archives or anything, but that cone is a very important piece of
>the airbox, and in my opinion, shouldn't be removed.  Not only does it
>smooth the airflow going in, but it also increases the velocity of
>incoming air.  The engineers at VAG may have done alot of things to make
>the cars people friendly, but I don't think that that is one of them.
>It definatley has a place and a need to be there.  If this has been
>proven on a track or dyno to increase power, then I guess I was wrong.
>But I don't think that I am.
>
>X


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"Racer X" <a3_driverhotmail> writes:
>When you guys say that you are removing the cone from you airbox, do you
>mean the horn on the inside of the filter?  I don't know what was said
>in the Archives or anything, but that cone is a very important piece of
>the airbox, and in my opinion, shouldn't be removed.  Not only does it
>smooth the airflow going in, but it also increases the velocity of
>incoming air.  The engineers at VAG may have done alot of things to make
>the cars people friendly, but I don't think that that is one of them.
>It definatley has a place and a need to be there.  If this has been
>proven on a track or dyno to increase power, then I guess I was wrong.
>But I don't think that I am.

I believe the fluid continuity equation says fluid will slow down as
it enters a larger space.   Given a constant flow rate (mass/sec)
you can transport more mass at a lower velocity given a larger cross
sectional area.  Therefore, our cone decreases air velocity, as air flows
from the small end to big end.  BTW, the fluid continuity eq holds for
both liquids and gases up to the speed of sound, at which point things get
really ugly.

Removing the cone has had no detrimental effects and even if it doesn't
increase power (which it feels like it does), it certainly sounds good.
And therein lies the ultimate purpose, methinks.  Over on some Mustang web
sites, I've noticed mention of something they call an intake silencer.  I
believe that is what our cone is.  It's simply there to trap sounds coming
back through the intake in its inverse horn configuration.  It works too.
The downside, is that it represents a large restriction in intake area.

How much?  Check this out.  Inside diameter at the big end is 2.75 inches
which makes for a cross sectional area of 5.94 sq inches.  The small end,
at it's narrowist is about 2.125 inches for a 3.55 sq inch area.   That's
a 40% decrease in area.

I don't think any other part of the airbox or intake is that narrow,
although I haven't followed the tube down from the bottom of the airbox to
see how big it is, so mabe someone else can tell me for sure.

Anyway, if you don't want to remove it, don't.  It's your car.

BTW, with regard to removal, I found that tugging alternately on one edge
and then the other with a pair of thin nosed pliers (not needle-nose), got
it out in about 30 seconds.  It doesn't look like it's moving, but it is,
1mm at a time.

>X

	ian


P.S. From what I can gather, the mustang intake silencer is placed sorta
  where our airbox snorkel brings in cold air, so when they remove it, they
  get more air, but it's hotter air.
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"Dave Moak" <veearesixgeocities> writes:
>With all due respect, I think you're wrong on this one. The cone is a
>Hemholtz resonator, and its sole function is to quiet the intake noise.

That is the exact name I've been looking for.  Someone should make sure it
ends up in the archives.  You'll note that the cone looks very much like
the tapered inlet tube on an old style round filter housing on top of the
engine.  One of the main purposes of that configuration was to reduce
noise from the intake.

>Removing it gives you slightly better throttle response (and a nice throaty
>sound), but yields no real HP gain.

I wonder if that holds true with a mod such as cams, which increases
the engine's ability to suck in air.  At some point that restriction
is going to have an impact, but probably only at the top end, in
stock trim.

>Dave

	ian
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