MAFs

[James Montebello]

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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