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

Thu Sep 1 18:41:58 EDT 2005

Could that honeycomb filter be a back fire suppressor?

Shayne

Bay Area, CA
Eastern WA State

PARTING:  1972 Mercedes Benz 280 SE 4.5
PARTING:  1986 Audi 4000 CS quattro

> From: "CB&D, LLC" <cbdllc at ntelos.net>
> Date: Wed, 31 Aug 2005 19:20:42 -0400
> To: "@V8 list" <v8 at audifans.com>
> Subject: Re: [V8] Driving with Air Filter Cover Off?-now K&N, etc
> 
> 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
>>> 
>>> 
>>> 
>>> 
>>> ---------------------------------
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>> 
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> 
> 
> 
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