MAFs

[John Dammeyer]

Hi guys,

This GM MAF sensor sounds interesting.  I'm in the process of computerizing
an Aluminum/Bronze melting furnace and had the bright light Idea that
measuring air flow along with a known orifice size and fixed propane
pressure could kill two birds with one stone.  I could detect furnace air
flow and therefore know that ignition and propane flow can continue or be
started and also determine the mass of the air.

Which GM vehicles use this MAF sensor or how much does GM want for it as a
replacement part.

What sort of output does it have or does it need a special circuit to drive
it?

Thanks,

John Dammeyer


----- Original Message -----
From: "James Montebello" <jamesm at lapuwali.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, February 05, 2001 2:57 PM
Subject: Re: MAFs


>
> No seal is perfect, particularly a seal around a shaft rotating at
> six-digit speeds.  But that wasn't my main point.
>
> I also never meant to suggest you weren't "doing this", only that the
> idea had never occurred to me, and surprised me.
>
> I was wondering aloud what the advantages would be over a draw-through
> MAF, or a speed/density system.  The disadvantage appears to be potential
> contamination of the MAF itself.  I fail to see the advantages, beyond
> a bit more simplicity.  Simplicity can be a complete reason in itself,
> as well as pragmatic reasons that doing so allows you to assemble parts
> you already have into a working system.  Just wondering if there are
> any other reasons.
>
> And by "fragile", I hardly meant mechanical strength, nor was I referring
> to any particular MAF sensor.  Most MAF sensors will not put up with
> anywhere near as much abuse as a solid-state MAP sensor.  If the late GM
> sensors do, then I'd say that's a welcome advance.
>
> james montebello
>
>
> On Mon, 5 Feb 2001, Bruce Plecan wrote:
>
> >
> > If the turbo's seals are gone, then that is the problem, and needs
> > addressed.   New GM MAFs are true hot wires, and nothing in the air
stream
> > (but the wires, and a bridge to hold them),  I shot Carb cleaner on it
and
> > no ill effects.   The film ones are another matter and they most often
have
> > a film board in the air stream (also often have a plastic case).
> > Picking parts for the right useage, is key.
> > If your calling the late GM MAF fragile you need to take another look.
AL
> > housing, O-Ring seals, fully encapsulated, I couldn't dream of better.
> > In my application, the MAF allows SEFI,  so while I spend $50 more on
the
> > MAF sensor, it's well spent in my opinion.
> > FWIW, I'm actually doing this, not quessing about it.
> > Bruce
> >
> >
> >
> > > Not just oil from the PCV, but oil from the turbo itself...
> > > I'd never even considered using a blow-through airflow meter
> > > configuration.  I suppose it would somewhat simplify the system, but
it
> > > seems you're trading off a set of cheap, robust sensors (MAP, crank
angle,
> > > and air temp) for a fragile, expensive one (MAF).
> > > james montebello
> >
>
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