Forwarded: Re: Airflow measurement - again...

[Fredrik Skog]

On Mon, 13 Jan 1997 kleenair at ix.netcom.com wrote:

> Todd Knighton wrote:
> > 
> > Mazda Ebrahimi wrote:
> > >
> > > That's a good question.  Also, I don't know much about the vane meters
> > > (I have never actually seen one on an engine), but are they not a little
> > > restrictive?
> > 
> > Mazda,
> >         I've measured the pressure drop of a vane type air flow meter on a 911
> > engine before.  If I remember right, it was about 14" H20 at redline.
> > The thing maintained about 5" H20 from about 1000 to 4500 rpm's at full
> > throttle where it was fully opened, then sloped up to 14" by 6500 rpm's.
> > 
> > Todd Knighton
> > Protomotive Engineering
> 
> Thanks Todd,
> 
> Do you know roughly what percentage power drop that equates to (from 5" 
> at 6000 to 14" at 6000)?
> 

In the early 70's, the BMW 2l engines had 130 HP with a kugelfisher all
mechanical fuel injection without air flow meter. In the mid 70's they
changed the injection to k-jetronic on the same engine type and the power
droped to 125 HP and the torque droped too. I'm not sure the amount of
torque drop, but maybe 10 Nm. The intake system were identical to the
later system except the addition of an air flow meter.

Hope this helps!

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Fredrik Skog				'70 2002 ti O==00==O  \\\  Amiga 1200
Email: c95fsg at cs.umu.se					       \\\ ///
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