MAFs

[Bruce Plecan]

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

> On Mon, 5 Feb 2001, Matt Henson wrote:

> > I'm trying to see the difference in intake air
> > behavior between a turbo and NA car.  The speed of the
> > air can cause turbulence but this should be the same
> > regardless of the aspiration.  One must choose an
> > appropriatly sized pipe for the flow of the system.  I
> > suppose that the compressor could do something to
> > swirl(?) the incoming (and certainly the outgoing) air
> > but if we're talking about a significant distance
> > between the MAF and compressor then it shouldn't
> > matter, should it?
> >
> > How does the IC affect the desirability of using blow
> > through vs pull-through?  The IC's effect on the air
> > mass should be measured either way, no? I've
> > considered going blow through but decided that the
> > life of the MAF would be reduced due to the oil in the
> > system.  I spoke with Corky Bell about this and he
> > found that his blow through MAFs only last around 10k
> > miles before the oil kills them.  If you can
> > effectively prevent the PCV from introducing the oil
> > mist into the intake then it should help with the MAF
> > life.
> >
> > Regards,
> > Matt
> >
> >
> > --- Bruce Plecan <nacelp at bright.net> wrote:
> > >
> > >
> > > OK. what makes you think that?.
> > > Maybe if the air column was inertia free,
> > > First thought of mine is well look at a bath tub
> > > drain.   Vortecs big time,
> > > just to get the water thru.  Air acts just like
> > > water, only far less dense.
> > >   Specifically they were blow thrus,  but if that
> > > bad blow thru, I can image
> > > problems either way.
> > > I've been going thru this in some detail,  luckily
> > > my car has an Intercooler
> > > so by locating the MAF between that and the TB just
> > > makes sense, least to
> > > me, and so far things are acting totally as
> > > expected.
> > > Bruce

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