[V8] Driving with Air Filter Cover Off?-now K&N, etc

[CB&D, LLC]

See the new Popular Mechanics magazine on the shelf now for a rundown on
testing of "magical gas saving devices".  They tested 6 or 8 different
devices claimed to increase mileage and HP including 2 different air swirl
devices.  They spent (way to much) time on the dyno testing HP and fuel
economy.  *NONE* of the devices helped at all, 2 even decreased HP and
increased fuel consumption, the rest did nothing, oh, one that wired in to
the plugs did catch fire.

Turbulent flow in gases and liquids delivers less volume than laminar flow
due to increased friction loss.

Jeff
-----Original Message-----
From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com]On Behalf
Of dsaad at icehouse.net
Sent: Wednesday, August 31, 2005 8:50 AM
To: v8 at audifans.com
Subject: Re: [V8] Driving with Air Filter Cover Off?-now K&N, etc



Why would you want a tornado?

There is a honeycomb screen at the intake. Its express purpose is to
"straighten" the air flow. "Laminar air flow" is what it is called. I am
sure I
spelled that wrong, but anyway, the MAF relies on a small sample of air to
accurately guage the total flow through the much larger chamber. Swiriling
the
air hurts - not helps this.

Perhaps the tornado would have some effect on a carburetted(sp?) motor, but
I
would think the swirling there would throw the fuel against the intake
runners
and slow down the air velocity - the very thing that helps charge the
cylinder.

As I understand motors, a swirl in the combustion chamber could be good, but
anywhere upstream from that is bad.

Dave


Quoting Tony and Lillie <tonyandlillie1 at earthlink.net>:

> Well, with 308k and counting fast, I'll say the K&N can't be that bad. My
> car came with it, and I probably wouldn't buy one myself. But, no sense in
> throwing it out. It's been on mine at least the last 100k. Plenty of
redline
> runs, and still strong as ever!
>
> I've seen plenty of the flow and particle tests, BTW. That's why I
wouldn't
> buy it myself, don't think it's worth the money fo rwhat you get. Then
> again, I'm fabricating my own "Tornado" for the same reason. Held one
> finally - $70 for this!
>
>
>
> ----- Original Message -----
> From: "S_Matus" <scott_matus at yahoo.com>
> To: <jward.v8 at gmail.com>; "V8" <v8 at audifans.com>
> Sent: Tuesday, August 30, 2005 10:36 AM
> Subject: [V8] Driving with Air Filter Cover Off?
>
>
> > The guys I run with that are fanatics about clean oil, call these gauze
> > filters - Knock & Noise (K&N).  The line is that you will be hearing
these
> > sounds after running a K&N filter.
> >
> > Scott.
> >
> > ------------------------------
> >
> > Message: 5
> > Date: Tue, 30 Aug 2005 08:21:35 -0700
> > From: Jeremy Ward <jward.v8 at gmail.com>
> > Subject: Re: [V8] Driving with Air Filter Cover Off?
> > To: "Klein, Nathan P" <nathan.p.klein at lmco.com>
> > Cc: v8 at audifans.com
> > Message-ID: <4ca624fb05083008217d00b4ce at mail.gmail.com>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > I agree with Ingo on this one.  My car came with a K&N and it cause so
> > much filth to enter the intake, that the butterfly valves on the TB
> > wouldn't close all the way.  This caused the throttle switch to not
> > work and threw the tranny in to limp-home-mode.  Not worth it in my
> > opinion for the 5(?)hp gain.  Some swear by the K&N so if you do use
> > it, make sure you follow the cleaning / oiling instructions to a T.
> >
> > Side note - the air intake horns are double walled from the factory to
> > reduce intake noise (remember this car was marketed as a luxury
> > performance car with the emphasis on the luxury).  Not sure if anyone
> > has replaced the factory setup to eliminate the double wall, but
> > remember this car LOVES cold air, as you will notice performance is in
> > the toilet on a hot day...  If you do go the cold air intake route,
> > make sure it's not a hot air intake instead ;-)
> >
> > Cheers,
> >
> > - Jeremy
> >
> >
> >
> >
> > ---------------------------------
> > Start your day with Yahoo! - make it your home page
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