MAF Flowbench (was Changing 165 / Nother Q)

[Eric Aos]

If anyone's keeping track here's a copy of that article

http://www.spiritone.com/~eoa/Cars/Flow_Bench/Flow_Bench.htm

Eric

> 
> 
> Popular Hot Rodding, (I think Pete Pesterierre (?) was still 
> editor)  in the
> Sept Oct isses some years ago built an econo flow bench, I'd 
> tell ya what
> year but a "friend" hasn't returned it, and it's been 3 
> years.  All of them
> are kinda noisy, but the leaf jobs Howl......
>    Back to back MAFs might not work right, unless you swtich them, and
> repeat the test one will be straightening the air even better 
> for the other.
>     Might think of a MAP for measuring the low side pressure, 
> and see what
> ya get so that x depression you get x measurement.  I'd keep 
> a known MAF for
> reference and compare to that, not trying to get x grams per 
> sec, just for
> relative flow rates.  Course cutomers in general just look at 
> the numbers.
> Course this MOB, is different...
> Grumpy
> 
> 
> > > Has anyone scientifically measured the effect on readings 
> between an
> > > unported, stock, screened MAF and a ported (no sink) and 
> un-screened
> MAF? I
> > > figgered roughly the percentage of area opened up, and a 
> little tweak
> for
> > > the reduction in air turbulance and went with that to 
> re-calibrate the
> MAF
> > > tables. I figgered a shop vac and a y-pipe and a volts 
> meter would give
> a
> > > ratio as well.  anyone done it?  share?  of coarse the 
> voltage reading
> will
> > > be lower for the gutted MAF,  but it would be cool to 
> have a graph of
> each
> > > at all flow levels ;-))
> >
> > I don't even know who asked this question, that post was 
> waay too fat
> > and random ;^) but...
> >
> > I've got "good intentions" on building a flowbench 
> "calibrator" for a
> > MAF, comparing a stock one to a ported one. The trick is 
> NOT a Y-pipe
> > but two MAFs in series. Since they're in series, you know 
> that the same
> > amount of air has to be flowing through both of them. 
> Measure the stock
> > MAF, measure the ported MAF, and there's your scaling. I 
> was going to do
> > 2-3 feet of PVC, followed by a stock MAF, then 2-3 feet 
> PVC, followed by
> > a ported MAF, then 2-3 feet PVC, followed by a leafblower 
> in suck mode.
> > And use some sort of contraption to throttle the air going in....
> >
> > Of course, it's down on my list of priorities right now, 
> but I was going
> > to do it for the LT1 MAFs. Someone may beat me to it, though...
> >
> > -Andrew
> > 
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