I'm missing something...

[Bob Wooten]

Yes, the concentration of O2 in a given volume of "air" is the same
regardless of the density of the air.  take 1 ft^3 of air @ 70Deg F & 29.92
"-hg & you are going to have the same 20.9% (or so) of O2 in that volume.
heat it up or move it to Denver & the % of O2 in that volume is going to be
the same, there is going to be less of it (less dense).

BW

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Stephen Webb
Sent: Monday, November 12, 2001 1:20 PM
To: 'diy_efi at diy-efi.org '
Subject: RE: I'm missing something...


> I'm not trying to be arguementitive, but I really want to understand this.
>
> My understanding was that the mass of the incoming air was what forced the
> flapper door open.  If this is so, then it should compensate for density,
> right?

Not sure how this one works, but if I read / remember correctly, the CIS
air plate sensors are referred to as "mass air sensors".  I believe that
they correctly compensate for temperature based density changes.

As far as altitude based oxygen density changes, one question comes to
mind:

Does the percentage of oxygen in the air (by mass) stay the same as
altitude changes?  If not then mas air flow isnt enough to predict oxygen
mass.

Just a thought.

-Steve


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