MAFs

[James Montebello]

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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