Air Flow Meter

[Steve Meade]

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> From: Kevin Rutledge <krr at teleport.com>
> To: diy_efi at coulomb.eng.ohio-state.edu
> Subject: Re: Air Flow Meter
> Date: Sunday, May 04, 1997 2:38 PM
> 
> I would not recommend a 90 degree turn or any other sharp turn for intake
> air flow, especially near air flow meters, the air flow characteristics
> change substantually with bends like that and some air flow meters won't
> sense air flow quite the right way (Bosch's hot wire is one).
> 
	This is on a different note, but kind of the same. Over on the BMW digest
(and I'm sure most performance auto lists) there is always some sort of
discussion about intake modifications. The ongoing discussion is usually
about those K&N "cone" air filter kits which replace the standard airbox. I
spoke with one person who dynoed his car before and after the addition of
one of this systems which essentially bolts right up to the air flow meter.
The power of his hi-revving 1.9L engine actually went *down* with the
vastly less-restrictive K&N cone. My theory is that the closeness of the
air filter causes the air entering the air flow meter to be much more
turbulent than stock causing the meter to fluctuate much more than normal
and give inaccurate readings which will result in less than optimum amounts
of fuel and thus less power. Does anyone have any actual experience with
this? One idea to rememdy the problem involves a carbon fiber or alluminum
tube between the air flow meter and cone to allow the air to smooth out.
Any thoughts?



> Kevin Rutledge
> Saab/Volvo Technician
=-=-=-=-=-=-=-=-=-=-=
Steve Meade
smeade at deltanet.com