Fw: [alfa] RE: using bimmer afm's on our 6 cyl alfas

["Daegrigg (Don)" <daegrigg@xxxxxxxxxxx>]

----- Original Message -----
From: Daegrigg (Don) <daegrigg@domain.elided>
To: Brian Shorey <bshorey@domain.elided>
Sent: Monday, October 27, 2003 10:54 AM
Subject: Re: [alfa] RE: using bimmer afm's on our 6 cyl alfas


> The question this raises has to do with the mass-flow (continuity)
equations
> or the principle of conservation of mass.     For  a  control  volume
that
> has  a  single  inlet  and  a  single  outlet,  the  principle  of
> conservation of mass says that (for steady-state flow), the mass flow rate
> into the volume must equal the mass flow rate out .
>
> The mass flow rate through the 2.5 inch section has to equal the rate in
the
> 3-inch section.   Change the section and the flow rate velocity has to
> remain the same but with the penalty of a pressure drop and possibly a
> moving pressure wave.  Can the AFM handle this?  It probably senses
> throttle position and flow rate both of which might be wrong with the
wrong
> inlet piping.
>
> So the better route would seem to be a constant diameter tubing but
> introduces other problems downstream depending on cams and computer.
>
> MTC
>
> Don
>
> ----- Original Message -----
> From: Brian Shorey <bshorey@domain.elided>
> To: <dsedon@domain.elided>
> Cc: <gmgraves@domain.elided>; <alfa-digest@domain.elided>
> Sent: Monday, October 27, 2003 10:55 AM
> Subject: RE: [alfa] RE: using bimmer afm's on our 6 cyl alfas
>
>
> > > hi pete, stretching the stock hose to fit the bmw afm worked
> > > fine for me - it's now 3", so no restriction!  ;~)  modding
> > > the top of the airbox lid to accept the bmw afm's much larger
> > > intake was a piece of cake, & i like getting outside (not
> > > from the engine bay) air into the engine...
> >
> > I *think* the point Peter was trying to make is that stretching a 2.5"
> > hose to make it fit over the 3" input at the AFM still leaves sections
> > of the hose further upstream that are 2.5" in diameter.  Peters
> > preferred method is to use 3" hose for the entire system.
> >
> > Seems like a valid point.
> >
> > bs
> > --
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